Red Hat Bugzilla – Bug 721234
CVE-2011-2696 libsndfile: Application crash due integer overflow by processing certain PAF audio files
Last modified: 2017-05-10 04:23:39 EDT
An integer overflow, leading to heap-based buffer overflow flaw was found in the way libsndfile, library for reading and writing of sound files, processed certain PARIS Audio Format (PAF) audio files with crafted count of channels in the PAF file header. A remote attacker could provided a specially-crafted PAF audio file, which once opened by a local, unsuspecting user in an application, linked against libsndfile could lead to that particular application crash (denial of service), or, potentially arbitrary code execution with the privileges of the user running the application. References: [1] https://bugs.gentoo.org/show_bug.cgi?id=375125 [2] http://www.securelist.com/en/advisories/45125 [3] http://secunia.com/advisories/45125/ [4] http://www.mega-nerd.com/libsndfile/ Relevant upstream patch (from Bzr log, local copy will be attached later too): revno: 1610 committer: Erik de Castro Lopo <erikd@mega-nerd.com> branch nick: libsndfile-dev timestamp: Wed 2011-07-06 19:40:05 +1000 message: Fix for Secunia Advisory SA45125, heap overflow in PAF file handler.
This issue affects the version of the libsndfile package, as present within EPEL-5 repository. Please schedule an update. -- This issue affects the version of the libsndfile package, as shipped with Red Hat Enterprise Linux 6. -- This issue affects the versions of the libsndfile package, as shipped with Fedora release of 14 and 15. Please schedule an update.
Created attachment 512812 [details] Promised local copy of upstream patch Retrieved via (couldn't find remote URL reference. Maybe there is one I am not aware of): bzr get http://www.mega-nerd.com/Bzr/libsndfile-dev/ bzr diff -r1609..1610 > /tmp/SASA45125_revno1609_1610.diff
CVE Request: [5] http://www.openwall.com/lists/oss-security/2011/07/14/1
Created libsndfile tracking bugs for this issue Affects: epel-5 [bug 721239] Affects: fedora-all [bug 721240]
Erik de Castro Lopo (upstream libsndfile maintainer) suggested, arbitrary code execution is not possible in this case: ======================================= Jan Lieskovsky wrote: > > an integer overflow, leading to heap-based buffer overflow flaw was > > found in the way libsndfile, library for reading and writing of sound > > files, processed certain PARIS Audio Format (PAF) audio files with > > crafted count of channels in the PAF file header. A remote attacker > > could provided a specially-crafted PAF audio file, which once opened by > > a local, unsuspecting user in an application, linked against libsndfile, > > could lead to that particular application crash (denial of service), I agree with everything up to here. > > or, potentially arbitrary code execution with the privileges of the > > user running the application. but this is rubbish. The heap gets overwritten with zeros which would certainly lead to the application segfaulting. However, there is no way for arbitrary code to be executed on amy sane OS with proper memory protection. Furthermore, Secunia when they contacted me about this said they would release information about this vulernability on the 18th and then ended up releasing it on the 12th instead which means I had to rush out the release I was working on (and would have easily had ready for the 18th). That is not the way to win friends and influence people. Regards, Erik -- ---------------------------------------------------------------------- Erik de Castro Lopo http://www.mega-nerd.com/ ======================================= Thus have adjusted the impact and severity of this issue appropriately.
This has been assigned CVE-2011-2696
This issue has been addressed in following products: Red Hat Enterprise Linux 6 Via RHSA-2011:1084 https://rhn.redhat.com/errata/RHSA-2011-1084.html