Privoxy 3.0.22 Multiple Vulns

2015.01.26
Credit: Fabian
Risk: High
Local: No
Remote: Yes
CVE: N/A
CWE: N/A

Privoxy is a non-caching web proxy with advanced filtering capabilities for enhancing privacy, modifying web page data and HTTP headers, controlling access, and removing ads and other obnoxious Internet junk. For details see: http://www.privoxy.org/ Privoxy 3.0.23 contains fixes for the following security issues: - Fixed a DoS issue in case of client requests with incorrect chunk-encoded body. When compiled with assertions enabled (the default) they could previously cause Privoxy to abort(). Reported by Matthew Daley. http://ijbswa.cvs.sourceforge.net/viewvc/ijbswa/current/jcc.c?r1=1.433&r2=1.434 - Fixed multiple segmentation faults and memory leaks in the pcrs code. This fix also increases the chances that an invalid pcrs command is rejected as such. Previously some invalid commands would be loaded without error. Note that Privoxy's pcrs sources (action and filter files) are considered trustworthy input and should not be writable by untrusted third-parties. http://ijbswa.cvs.sourceforge.net/viewvc/ijbswa/current/pcrs.c?r1=1.46&r2=1.47 - Fixed an 'invalid read' bug which could at least theoretically cause Privoxy to crash. http://ijbswa.cvs.sourceforge.net/viewvc/ijbswa/current/parsers.c?r1=1.297&r2=1.298 Please assign CVEs for them. The second issue could potentially affect other programs that use pcrs.c, but I'm not aware of any that do. Privoxy imported the file from the upstream project pcrs (not to be confused with pcre) which is no longer maintained. The last two issues were partially discovered with afl-fuzz. Fabian

References:

http://ijbswa.cvs.sourceforge.net/viewvc/ijbswa/current/parsers.c?r1=1.297&r2=1.298
http://ijbswa.cvs.sourceforge.net/viewvc/ijbswa/current/pcrs.c?r1=1.46&r2=1.47
http://ijbswa.cvs.sourceforge.net/viewvc/ijbswa/current/jcc.c?r1=1.433&r2=1.434
http://seclists.org/oss-sec/2015/q1/259


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