Privoxy 3.0.32 User Manual
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# 3. What's New in this Release

Privoxy 3.0.32 fixes multiple DoS issues and a couple of other bugs. The issues also affect earlier Privoxy releases.

Changes in Privoxy 3.0.32 stable:

- Security/Reliability:

  - ssplit(): Remove an assertion that could be triggered with a crafted CGI request. Commit 2256d7b4d67. OVE-20210203-0001. Reported by: Joshua Rogers (Opera)

  - cgi_send_banner(): Overrule invalid image types. Prevents a crash with a crafted CGI request if Privoxy is toggled off. Commit e711c505c48. OVE-20210206-0001. Reported by: Joshua Rogers (Opera)

  - socks5_connect(): Don't try to send credentials when none are configured. Fixes a crash due to a NULL-pointer dereference when the socks server misbehaves. Commit 85817cc55b9. OVE-20210207-0001. Reported by: Joshua Rogers (Opera)

  - chunked_body_is_complete(): Prevent an invalid read of size two. Commit a912ba7bc9c. OVE-20210205-0001. Reported by: Joshua Rogers (Opera)

  - Obsolete pcre: Prevent invalid memory accesses with an invalid pattern passed to pcre_compile(). Note that the obsolete pcre code is scheduled to be removed before the 3.0.33 release. There has been a warning since since 2008 already. Commit 28512e5b624. OVE-20210222-0001. Reported by: Joshua Rogers (Opera)

- Bug fixes:

  - Properly parse the client-tag-lifetime directive. Previously it was not accepted as an obsolete hash value was being used. Reported by: Joshua Rogers (Opera)

  - decompress_iob(): Prevent reading of uninitialized data. Reported by: Joshua Rogers (Opera).

  - decompress_iob(): Don't advance cur past eod when looking for the end of the file name and comment.

  - decompress_iob(): Cast value to unsigned char before shifting. Prevents a left-shift of a negative value which is undefined behaviour. Reported by: Joshua Rogers (Opera)

  - gif_deanimate(): Confirm that that we have enough data before doing any work. Fixes a crash when fuzzing with an empty document. Reported by: Joshua Rogers (Opera).

  - buf_copy(): Fail if there's no data to write or nothing to do. Prevents undefined behaviour "applying zero offset to null pointer". Reported by: Joshua Rogers (Opera)

  - log_error(): Treat LOG_LEVEL_FATAL as fatal even when --stfu is being used while fuzzing. Reported by: Joshua Rogers (Opera).

  - Respect DESTDIR when considering whether or not to install config files with ".new" extension.

  - OpenSSL ssl_store_cert(): Fix two error messages.

  - Fix a couple of format specifiers.

  - Silence compiler warnings when compiling with NDEBUG.

  - fuzz_server_header(): Fix compiler warning.

  - fuzz_client_header(): Fix compiler warning.

  - cgi_send_user_manual(): Also reject requests if the user-manual directive specifies a https:// URL. Previously Privoxy would try and fail to open a local file.

- General improvements:

  - Log the TLS version and the the cipher when debug 2 is enabled..

  - ssl_send_certificate_error(): Respect HEAD requests by not sending a body.

  - ssl_send_certificate_error(): End the body with a single new line.

  - serve(): Increase the chances that the host is logged when closing a server socket.

  - handle_established_connection(): Add parentheses to clarify an expression Suggested by: David Binderman

  - continue_https_chat(): Explicitly unset CSP_FLAG_CLIENT_CONNECTION_KEEP_ALIVE if process_encrypted_request() fails. This makes it more obvious that the connection will not be reused. Previously serve() relied on CSP_FLAG_SERVER_CONTENT_LENGTH_SET and CSP_FLAG_CHUNKED being unset. Inspired by a patch from Joshua Rogers (Opera).

  - decompress_iob(): Add periods to a couple of log messages

  - Terminate the body of the HTTP snipplets with a single new line instead of "\r\n".

  - configure: Add --with-assertions option and only enable assertions when it is used

  - windows build: Use --with-brotli and --with-mbedtls by default and enable dynamic error checking.

  - gif_deanimate(): Confirm we've got an image before trying to write it Saves a pointless buf_copy() call.

  - OpenSSL ssl_store_cert(): Remove a superfluous space before the serial number.

- Action file improvements:

  - Disable fast-redirects for .golem.de/

  - Unblock requests to adri*.

  - Block requests for trc*.taboola.com/

  - Disable fast-redirects for .linkedin.com/

- Filter file improvements:

  - Make the second pcrs job of the img-reorder filter greedy again. The ungreedy version broke the img tags on: https://bulk.fefe.de/scalability/.

- Privoxy-Log-Parser:

  - Highlight a few more messages.

  - Clarify the --statistics output. The shown "Reused connections" are server connections so name them appropriately.

  - Bump version to 0.9.3.

- Privoxy-Regression-Test:

  - Add the --check-bad-ssl option to the --help output.

  - Bump version to 0.7.3.

- Documentation:

  - Add pushing the created tag to the release steps in the developer manual.

  - Clarify that 'debug 32768' should be used in addition to the other debug directives when reporting problems.

  - Add a 'Third-party licenses and copyrights' section to the user manual.

## 3.1. Note to Upgraders

A quick list of things to be aware of before upgrading from earlier versions of Privoxy:

- The recommended way to upgrade Privoxy is to backup your old configuration files, install the new ones, verify that Privoxy is working correctly and finally merge back your changes using diff and maybe patch.

  There are a number of new features in each Privoxy release and most of them have to be explicitly enabled in the configuration files. Old configuration files obviously don't do that and due to syntax changes using old configuration files with a new Privoxy isn't always possible anyway.

- Note that some installers remove earlier versions completely, including configuration files, therefore you should really save any important configuration files!

- On the other hand, other installers don't overwrite existing configuration files, thinking you will want to do that yourself.

- In the default configuration only fatal errors are logged now. You can change that in the debug section of the configuration file. You may also want to enable more verbose logging until you verified that the new Privoxy version is working as expected.

- Three other config file settings are now off by default: enable-remote-toggle, enable-remote-http-toggle, and enable-edit-actions. If you use or want these, you will need to explicitly enable them, and be aware of the security issues involved.

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