- Announcing Privoxy v.3.0.17 stable
------------------------------------------------------------------
-
-This is mainly a bug-fix release for the previously released Privoxy 3.0.16.
-
-It contains fixes for two bugs that could cause connections to hang under
-certain circumstances when keep-alive support was enabled, until they timed
-out or where closed by the server.
+ Announcing Privoxy 3.0.33 stable
+--------------------------------------------------------------------
-See http://www.privoxy.org/3.0.17/user-manual/whatsnew.html for details.
+Privoxy 3.0.33 fixes an XSS issue, multiple DoS issues and a
+couple of other bugs. The issues also affect earlier Privoxy releases.
+Privoxy 3.0.33 also comes with a couple of general improvements and
+new features.
--------------------------------------------------------------------
-ChangeLog for Privoxy
+ChangeLog for Privoxy 3.0.33
--------------------------------------------------------------------
-*** Version 3.0.17 Stable ***
-
-- Fixed last-chunk-detection for responses where the content was small
- enough to be read with the body, causing Privoxy to wait for the
- end of the content until the server closed the connection or the
- request timed out. Reported by "Karsten" in #3028326.
-- Responses with status code 204 weren't properly detected as body-less
- like RFC2616 mandates. Like the previous bug, this caused Privoxy to
- wait for the end of the content until the server closed the connection
- or the request timed out. Fixes #3022042 and #3025553, reported by a
- user with no visible name. Most likely also fixes a bunch of other
- AJAX-related problem reports that got closed in the past due to
- insufficient information and lack of feedback.
-- Fixed an ACL bug that made it impossible to build a blacklist.
- Usually the ACL directives are used in a whitelist, which worked
- as expected, but blacklisting is still useful for public proxies
- where one only needs to deny known abusers access.
-- Added LOG_LEVEL_RECEIVED to log the not-yet-parsed data read from the
- network. This should make debugging various parsing issues a lot easier.
-- The IPv6 code is enabled by default on Windows versions that support it.
- Patch submitted by oCameLo in #2942729.
-- In mingw32 versions, the user.filter file is reachable through the
- GUI, just like default.filter is. Feature request 3040263.
-- Added the configure option --enable-large-file-support to set a few
- defines that are required by platforms like GNU/Linux to support files
- larger then 2GB. Mainly interesting for users without proper logfile
- management.
-- Logging with "debug 16" no longer stops at the first nul byte which is
- pretty useless. Non-printable characters are replaced with their hex value
- so the result can't span multiple lines making parsing them harder then
- necessary.
-- Privoxy logs when reading an action, filter or trust file.
-- Fixed incorrect regression test markup which caused a test in
- 3.0.16 to fail while Privoxy itself was working correctly.
- While Privoxy accepts hide-referer, too, the action name is actually
- hide-referrer which is also the name used one the final results page,
- where the test expected the alias.
-
-- CGI interface improvements:
- - In finish_http_response(), continue to add the 'Connection: close'
- header if the client connection will not be kept alive.
- Anonymously pointed out in #2987454.
- - Apostrophes in block messages no longer cause parse errors
- when the blocked page is viewed with JavaScript enabled.
- Reported by dg1727 in #3062296.
- - Fix a bunch of anchors that used underscores instead of dashes.
- - Allow to keep the client connection alive after crunching the previous request.
- Already opened server connections can be kept alive, too.
- - In cgi_show_url_info(), don't forget to prefix URLs that only contain
- http:// or https:// in the path. Fixes #2975765 reported by Adam Piggott.
- - Show the 404 CGI page if cgi_send_user_manual() is called while
- local user manual delivery is disabled.
+- Security/Reliability:
+ - cgi_error_no_template(): Encode the template name to prevent
+ XSS (cross-site scripting) when Privoxy is configured to servce
+ the user-manual itself.
+ Commit 0e668e9409c. OVE-20211102-0001. CVE-2021-44543.
+ Reported by: Artem Ivanov
+ - get_url_spec_param(): Free memory of compiled pattern spec
+ before bailing.
+ Reported by Joshua Rogers (Opera) who also provided the fix.
+ Commit 652b4b7cb0. OVE-20211201-0003. CVE-2021-44540.
+ - process_encrypted_request_headers(): Free header memory when
+ failing to get the request destination.
+ Reported by Joshua Rogers (Opera) who also provided the fix.
+ Commit 0509c58045. OVE-20211201-0002. CVE-2021-44541.
+ - send_http_request(): Prevent memory leaks when handling errors
+ Reported by Joshua Rogers (Opera) who also provided the fix.
+ Commit c48d1d6d08. OVE-20211201-0001. CVE-2021-44542.
+
+- Bug fixes:
+ - handle_established_connection(): Skip the poll()/select() calls
+ if TLS data is pending on the server socket. The TLS library may
+ have already consumed all the data from the server response in
+ which case poll() and select() will not detect that data is
+ available to be read.
+ Fixes SF bug #926 reported by Wen Yue.
+ - continue_https_chat(): Update csp->server_connection.request_sent
+ after sending the request to make sure the latency is calculated
+ correctly. Previously https connections were not reused after
+ timeout seconds after the first request made on the connection.
+ - free_pattern_spec(): Don't try to free an invalid pointer
+ when unloading an action file with a TAG pattern while
+ Privoxy has been compiled without FEATURE_PCRE_HOST_PATTERNS.
+ Closes: SF patch request #147. Patch by Maxim Antonov.
+ - Adjust build_request_line() to create a CONNECT request line when
+ https-inspecting and forwarding to a HTTP proxy.
+ Fixes SF bug #925 reported by Wen Yue.
+ - load_config(): Add a space that was missing in a log message.
+ - read_http_request_body(): Fix two error messages that used an
+ incorrect variable.
+ - If the the response is chunk-encoded, ignore the Content-Length
+ header sent by the server.
+ Allows to load https://redmine.lighttpd.net/ with filtering enabled.
+
+- General improvements:
+ - Allow to edit the add-header action through the CGI editor by
+ generalizing the code that got added with the suppress-tag action.
+ Closes SF patch request #146. Patch by Maxim Antonov.
+ - Add a CGI handler for /wpad.dat that returns a
+ Proxy Auto-Configuration (PAC) file.
+ Among other things, it can be used to instruct clients
+ through DHCP to use Privoxy as proxy.
+ For example with the dnsmasq option:
+ dhcp-option=252,http://config.privoxy.org/wpad.dat
+ Initial patch by Richard Schneidt.
+ - Don't log the applied actions in process_encrypted_request()
+ Log them in continue_https_chat() instead to mirror chat().
+ Prevents the applied actions from getting logged twice
+ for the first request on an https-inspected connection.
+ - OpenSSL generate_host_certificate(): Use config.privoxy.org as Common Name
+ Org and Org Unit if the real host name is too long to get accepted by OpenSSL.
+ Clients should only care about the Subject Alternative Name
+ anyway and we can continue to use the real host name for it.
+ Reported by Miles Wen on privoxy-users@.
+ - Establish the TLS connection with the client earlier and decide
+ how to route the request afterwards. This allows to change the
+ forwarding settings based on information from the https-inspected
+ request, for example the path.
+ - listen_loop(): When shutting down gracefully, close listening ports
+ before waiting for the threads to exit. Allows to start a second
+ Privoxy with the same config file while the first Privoxy is still
+ running.
+ - serve(): Close the client socket as well if the server socket
+ for an inspected connection has been closed. Privoxy currently
+ can't establish a new server connection when the client socket
+ is reused and would drop the connection in continue_https_chat()
+ anyway.
+ - Don't disable redirect checkers in redirect_url().
+ Disable them in handle_established_connection() instead.
+ Doing it in redirect_url() prevented the +redirect{} and
+ +fast-redirects{} actions from being logged with LOG_LEVEL_ACTIONS.
+ - handle_established_connection(): Slightly improve a comment.
+ - handle_established_connection(): Fix a comment.
+ - socks5_connect(): Fix indentation.
+ - handle_established_connection(): Improve an error message.
+ - create_pattern_spec(): Fix ifdef indentation.
+ - Fix comment typos.
+ - process_encrypted_request(): Improve a log message.
+ The function only processes request headers and there
+ may still be unread request body data left to process.
+ - chat(): Log the applied actions before deciding how to forward the request.
+ - parse_time_header(): Silence a coverity complaint when building without assertions.
+ - receive_encrypted_request_headers(): Improve a log message.
+ - mbedTLS get_ciphersuites_from_string(): Use strlcpy() instead of strncpy().
+ Previously the terminating NUL wasn't copied which resulted
+ in a compiler warning. This didn't cause actual problems as
+ the target buffer was initialized by zalloc_or_die() so the
+ last byte of the target buffer was NUL already.
+ Actually copying the terminating NUL seems clearer, though.
+ - Remove compiler warnings. "log_error(LOG_LEVEL_FATAL, ..."
+ doesn't return but apparently the compiler doesn't know that.
+ Get rid of several "this statement may fall through
+ [-Wimplicit-fallthrough=]" warnings.
+ - Store the PEM certificate in a dynamically allocated buffer
+ when https-inspecting. Should prevent errors like:
+ 2021-03-16 22:36:19.148 7f47bbfff700 Error: X509 PEM cert len 16694 is larger than buffer len 16383
+ As a bonus it should slightly reduce the memory usage as most
+ certificates are smaller than the previously used fixed buffer.
+ Reported by: Wen Yue
+ - OpenSSL generate_host_certificate(): Fix two error messsages.
+ - Improve description of handle_established_connection()
+ - OpenSSL ssl_store_cert(): Translate EVP_PKEY_EC to a string.
+ - OpenSSL ssl_store_cert(): Remove pointless variable initialization.
+ - OpenSSL ssl_store_cert(): Initialize pointer with NULL instead of 0.
- Action file improvements:
- - Enable user.filter by default. Suggested by David White in #3001830.
- - Block .sitestat.com/. Reported by johnd16 in #3002725.
- - Block .atemda.com/. Reported by johnd16 in #3002723.
- - Block js.adlink.net/. Reported by johnd16 in #3002720.
- - Block .analytics.yahoo.com/. Reported by johnd16 in #3002713.
- - Block sb.scorecardresearch.com, too. Reported by dg1727 in #2992652.
- - Fix problems noticed on Yahoo mail and news pages.
- - Remove the too broad yahoo section, only keeping the
- fast-redirects exception as discussed on ijbswa-devel@.
- - Don't block adesklets.sourceforge.net. Reported in #2974204.
- - Block chartbeat ping tracking. Reported in #2975895.
- - Tag CSS and image requests with cautious and medium settings, too.
- - Don't handle view.atdmt.com as image. It's used for click-throughs
- so users should be able to "go there anyway".
- Reported by Adam Piggott in #2975927.
- - Also let the refresh-tags filter remove invalid refresh tags where
- the 'url=' part is missing. Anonymously reported in #2986382.
- While at it, update the description to mention the fact that only
- refresh tags with refresh times above 9 seconds are covered.
- - javascript needs to be blocked with +handle-as-empty-document to
- work around Firefox bug 492459. So move .js blockers from
- +block{Might be a web-bug.} -handle-as-empty-document to
- +block{Might be a web-bug.} +handle-as-empty-document.
- - ijbswa-Feature Requests-3006719 - Block 160x578 Banners.
- - Block another omniture tracking domain.
- - Added a range-requests tagger.
- - Added two sections to get Flickr's Ajax interface working with
- default pre-settings. If you change the configuration to block
- cookies by default, you'll need additional exceptions.
- Reported by Mathias Homann in #3101419 and by Patrick on ijbswa-users@.
-
-- Documentation improvements:
- - Explicitly mention how to match all URLs.
- - Consistently recommend socks5 in the Tor FAQ entry and mention
- its advantage compared to socks4a. Reported by David in #2960129.
- - Slightly improve the explanation of why filtering may appear
- slower than it is.
- - Grammar fixes for the ACL section.
- - Fixed a link to the 'intercepting' entry and add another one.
- - Rename the 'Other' section to 'Mailing Lists' and reword it
- to make it clear that nobody is forced to use the trackers
- - Note that 'anonymously' posting on the trackers may not always
- be possible.
- - Suggest to enable debug 32768 when suspecting parsing problems.
-
-- Privoxy-Log-Parser improvements:
- - Gather statistics for resources, methods, and HTTP versions
- used by the client.
- - Also gather statistics for blocked and redirected requests.
- - Provide the percentage of keep-alive offers the client accepted.
- - Add a --url-statistics-threshold option.
- - Add a --host-statistics-threshold option to also gather
- statistics about how many request where made per host.
- - Fix a bug in handle_loglevel_header() where a 'scan: ' got lost.
- - Add a --shorten-thread-ids option to replace the thread id with
- a decimal number.
- - Accept and ignore: Looks like we got the last chunk together
- with the server headers. We better stop reading.
- - Accept and ignore: Continue hack in da house.
- - Accept and highlight: Rejecting connection from 10.0.0.2.
- Maximum number of connections reached.
- - Accept and highlight: Loading actions file: /usr/local/etc/privoxy/default.action
- - Accept and highlight: Loading filter file: /usr/local/etc/privoxy/default.filter
- - Accept and highlight: Killed all-caps Host header line: HOST: bestproxydb.com
- - Accept and highlight: Reducing expected bytes to 0. Marking
- the server socket tainted after throwing 4 bytes away.
- - Accept: Merged multiple header lines to: 'X-FORWARDED-PROTO: http X-HOST: 127.0.0.1'
-
-- Code cleanups:
- - Remove the next member from the client_state struct. Only the main
- thread needs access to all client states so give it its own struct.
- - Garbage-collect request_contains_null_bytes().
- - Ditch redundant code in unload_configfile().
- - Ditch LogGetURLUnderCursor() which doesn't seem to be used anywhere.
- - In write_socket(), remove the write-only variable write_len in
- an ifdef __OS2__ block. Spotted by cppcheck.
- - In connect_to(), don't declare the variable 'flags' on OS/2 where
- it isn't used. Spotted by cppcheck.
- - Limit the scope of various variables. Spotted by cppcheck.
- - In add_to_iob(), turn an interestingly looking for loop into a
- boring while loop.
- - Code cleanup in preparation for external filters.
- - In listen_loop(), mention the socket on which we accepted the
- connection, not just the source IP address.
- - In write_socket(), also log the socket we're writing to.
- - In log_error(), assert that escaped characters get logged
- completely or not at all.
- - In log_error(), assert that ival and sval have reasonable values.
- There's no reason not to abort() if they don't.
- - Remove an incorrect cgi_error_unknown() call in a
- cannnot-happen-situation in send_crunch_response().
- - Clean up white-space in http_response definition and
- move the crunch_reason to the beginning.
- - Turn http_response.reason into an enum and rename it
- to http_response.crunch_reason.
- - Silence a 'gcc (Debian 4.3.2-1.1) 4.3.2' warning on i686 GNU/Linux.
- - Fix white-space in a log message in remove_chunked_transfer_coding().
- While at it, add a note that the message doesn't seem to
- be entirely correct and should be improved later on.
-
-- GNUmakefile improvements:
- - Use $(SSH) instead of ssh, so one only needs to specify a username once.
- - Removed references to the action feedback thingy that hasn't been
- working for years.
- - Consistently use shell.sourceforge.net instead of shell.sf.net so
- one doesn't need to check server fingerprints twice.
- - Removed GNUisms in the webserver and webactions targets so they
- work with standard tar.
+ - Disable fast-redirects for .microsoftonline.com/.
+ - Disable fast-redirects for idp.springer.com/.
+ - Disable fast-redirects for .zeit.de/zustimmung.
+ - Unblock adv-archiv.dfn-cert.de/.
+ - Block requests to eu-tlp01.kameleoon.eu/.
+ - Block requests to fpa-events.arstechnica.com/.
+ - Unblock nlnet.nl/.
+ - Unblock adguard.com/.
+
+- Privoxy-Log-Parser:
+ - Highlight 'Socket timeout 3 reached: http://127.0.0.1:20000/no-filter/chunked-content/36'.
+ - Improve documentation for inactivity-detection mode.
+ - Detect date changes when looking for inactivity.
+ - Add a --passed-request-statistics-threshold option
+ that can be set to get statistics for requests that
+ were passed.
+ - Add a "inactivity detection" mode which can be useful
+ for debugging purposes.
+ - Bump version to 0.9.4.
+ - Only run print_intro() and print_outro() when syntax highlighting.
+ - Rephrase a sentence in the documentation.
+ - Highlight 'Client socket 7 is no longer usable. The server socket has been closed.'.
+ - Clarify --statistics output by explicitly mentioning that
+ the status codes sent by the server may differ from the ones
+ in "debug 512" messages.
+ - Fix typo in the --statistics output.
+ - Remove an unused variable.
+ - Highlight 'The peer notified us that the connection on socket 11 is going to be closed'.
+
+- Privoxy-Regression-Test:
+ - Remove duplicated word in a comment.
+
+- regression-tests.action:
+ - Add fetch test for http://p.p/wpad.dat.
+ - Bump for-privoxy-version to 3.0.33 which introduced the wpad.dat support.
+ - Add more tests for the '/send-banner' code.
+ - Add test for OVE-20210203-0001.
+ - Add a test for CVE-2021-20217.
+
+- uagen:
+ - Bump generated Firefox version to 91 (ESR).
+ - Bump version to 1.2.3.
+ - Bump copyright.
+
+- Build system:
+ - configure: Bump SOURCE_DATE_EPOCH.
+ - GNUmakefile.in: Fix typo.
+ - configure: Add another warning in case --disable-pthread
+ is used while POSIX threads are available.
+ Various features don't even compile when not using threads.
+ - Add configure option to enable MemorySanitizer.
+ - Add configure option to enable UndefinedBehaviorSanitizer.
+ - Add configure option to enable AddressSanitizer.
+ - Bump copyright.
+ - Add a configure option to disable pcre JIT compilation.
+ While JIT compilation makes filtering faster it can
+ cause false-positive valgrind complaints.
+ As reported by Gwyn Ciesla in SF bug 924 it also can
+ cause problems when the SELinux policy does not grant
+ Privoxy "execmem" privileges.
+ - configure: Remove obsolete RPM_BASE check.
+
+- Windows build system:
+ - Update the build script to use mbed tls version 2.6.11.
+ - Update build script to use the final 8.45 pcre library.
+ - Put all the '--enable-xxx' options in the configure call together.
+
+- macOS build system:
+ - The OSXPackageBuilder repository has been updated and
+ can be used to create macOS packages again.
+
+- Documentation:
+ - contacting: Remove obsolete reference to announce.sgml.
+ - contacting: Request that the browser cache is cleared before
+ producing a log file for submission.
+ - Sponsor FAQ: Note that Privoxy users may follow sponsor links
+ without Referer header set.
+ - newfeatures: Clarify that https inspection also allows to
+ filter https responses.
+ - developer-manual: Mention that announce.txt should be updated
+ when doing a release.
+ - config: Explicitly mention that the CGI pages disclosing the
+ ca-password can be blocked and upgrade the disclosure paragraphs
+ to a warning.
+ - Put all the requested debug options in the config file.
+ Section 11.1 of the Privoxy user manual lists all the debug
+ options that should be enabled when reporting problems or requesting support.
+ Make it easier for users to do the right thing by having all those
+ options present in the config.
+ - Update TODO list item #184 to note that WolfSSL support will
+ (hopefully) appear after the 3.0.34 release.
+ - Update max-client-connections's description.
+ On modern systems other than Windows Privoxy should
+ use poll() in which case the FD_SETSIZE value isn't
+ releveant.
+ - Add a warning that the socket-timeout does not apply
+ to operations done by TLS libraries.
+ - Make documentation slightly less "offensive" for some people
+ by avoiding the word "hell".
-----------------------------------------------------------------
About Privoxy:
Privoxy is Free Software and licensed under the GNU GPLv2.
-Privoxy is an associated project of Software in the Public Interest (SPI).
+Our TODO list is rather long. Helping hands and donations are welcome:
-Helping hands and donations are welcome:
+ * https://www.privoxy.org/participate
- * http://www.privoxy.org/faq/general.html#PARTICIPATE
+ * https://www.privoxy.org/donate
- * http://www.privoxy.org/faq/general.html#DONATE
-
-At present, Privoxy is known to run on Windows(95, 98, ME, 2000,
-XP, Vista), GNU/Linux (Ubuntu, RedHat, SuSE, Debian, Fedora, Gentoo and
-others), Mac OSX, OS/2, AmigaOS, FreeBSD, NetBSD, OpenBSD, Solaris, and
-various other flavors of Unix.
+At present, Privoxy is known to run on Windows 95 and later versions
+(98, ME, 2000, XP, Vista, Windows 7, Windows 10 etc.), GNU/Linux
+(RedHat, SuSE, Debian, Fedora, Gentoo, Slackware and others),
+Mac OS X (10.4 and upwards on PPC and Intel processors), Haiku,
+DragonFly, ElectroBSD, FreeBSD, NetBSD, OpenBSD, Solaris,
+and various other flavors of Unix.
In addition to the core features of ad blocking and cookie management,
Privoxy provides many supplemental features, that give the end-user
more control, more privacy and more freedom:
+ * Supports "Connection: keep-alive". Outgoing connections can be kept
+ alive independently from the client. Currently not available on all
+ platforms.
- * Supports "Connection: keep-alive". Outgoing connections can be kept
- alive independently from the client. Currently not available on all
- platforms.
+ * Supports IPv6, provided the operating system does so too,
+ and the configure script detects it.
- * Supports IPv6, provided the operating system does so too,
- and the configure script detects it.
+ * Supports tagging which allows to change the behaviour based on client
+ and server headers.
- * Supports tagging which allows to change the behaviour based on client
- and server headers.
+ * Supports https inspection which allows to filter https requests.
- * Can be run as an "intercepting" proxy, which obviates the need to
- configure browsers individually.
+ * Can be run as an "intercepting" proxy, which obviates the need to
+ configure browsers individually.
- * Sophisticated actions and filters for manipulating both server and
- client headers.
+ * Sophisticated actions and filters for manipulating both server and
+ client headers.
- * Can be chained with other proxies.
+ * Can be chained with other proxies.
- * Integrated browser based configuration and control utility at
- http://config.privoxy.org/ (shortcut: http://p.p/). Browser-based
- tracing of rule and filter effects. Remote toggling.
+ * Integrated browser based configuration and control utility at
+ http://config.privoxy.org/ (shortcut: http://p.p/). Browser-based
+ tracing of rule and filter effects. Remote toggling.
- * Web page filtering (text replacements, removes banners based on size,
- invisible <quote>web-bugs</quote> and HTML annoyances, etc.)
+ * Web page filtering (text replacements, removes banners based on size,
+ invisible "web-bugs" and HTML annoyances, etc.)
- * Modularized configuration that allows for standard settings and user
- settings to reside in separate files, so that installing updated actions
- files won't overwrite individual user settings.
+ * Modularized configuration that allows for standard settings and user
+ settings to reside in separate files, so that installing updated actions
+ files won't overwrite individual user settings.
- * Support for Perl Compatible Regular Expressions in the configuration
- files, and a more sophisticated and flexible configuration syntax.
+ * Support for Perl Compatible Regular Expressions in the configuration
+ files, and a more sophisticated and flexible configuration syntax.
- * GIF de-animation.
+ * GIF de-animation.
- * Bypass many click-tracking scripts (avoids script redirection).
+ * Bypass many click-tracking scripts (avoids script redirection).
- * User-customizable HTML templates for most proxy-generated pages (e.g.
- "blocked" page).
+ * User-customizable HTML templates for most proxy-generated pages (e.g.
+ "blocked" page).
- * Auto-detection and re-reading of config file changes.
-
- * Most features are controllable on a per-site or per-location basis.
+ * Auto-detection and re-reading of config file changes.
+ * Most features are controllable on a per-site or per-location basis.
-Download location:
- http://sourceforge.net/project/showfiles.php?group_id=11118
-
-Home Page:
- http://www.privoxy.org/
+Home Page:
+ https://www.privoxy.org/
- - Privoxy Developers <ijbswa-developers@lists.sourceforge.net>
+ - Privoxy Developers <privoxy-devel@lists.privoxy.org>