Date: Tue, 1 Nov 2016 10:19:36 +0100 From: Andrej Nemec <anemec@...hat.com> To: oss-security@...ts.openwall.com Subject: Re: Memcached 1.4.32 and earlier buffer overflow. As per Talos page, there seems to be three issues. CVE-2016-8704 - Memcached server append/prepend remote code execution vulnerability An integer overflow in the process_bin_append_prepend function which is responsible for processing multiple commands of Memcached binary protocol can be abused to cause heap overflow and lead to remote code execution. http://www.talosintelligence.com/reports/TALOS-2016-0219/ CVE-2016-8705 - Memcached server update remote code execution vulnerability Multiple integer overflows in process_bin_update function which is responsible for processing multiple commands of Memcached binary protocol can be abused to cause heap overflow and lead to remote code execution. http://www.talosintelligence.com/reports/TALOS-2016-0220/ CVE-2016-8706 - Memcached server SASL authentication remote code execution vulnerability An integer overflow in process_bin_sasl_auth function which is responsible for authentication commands of Memcached binary protocol can be abused to cause heap overflow and lead to remote code execution. http://www.talosintelligence.com/reports/TALOS-2016-0221/ There is also a talos blog post about these issues: http://blog.talosintel.com/2016/10/memcached-vulnerabilities.html Thanks for sharing! -- Andrej Nemec, Red Hat Product Security 3701 3214 E472 A9C3 EFBE 8A63 8904 44A1 D57B 6DDA On 10/31/2016 11:35 PM, dormando wrote: > Release notes with tarball here: > https://github.com/memcached/memcached/wiki/ReleaseNotes1433 > > Copy/paste from the relase notes: > Serious remote code execution bugs are fixed in this release. > > The bugs are related to the binary protocol as well as SASL authentication > of the binary protocol. > > If you do not use the binary protocol at all, a workaround is to start > memcached with -B ascii - otherwise you will need the patch in this > release. > > The diff may apply cleanly to older versions as the affected code has not > changed in a long time. > > Full details of the issues may be found here: > http://blog.talosintel.com/2016/10/memcached-vulnerabilities.html > > In summary: two binary protocol parsing errors, and a SASL authentication > parsing error allows buffer overflows of keys into arbitrary memory > space. With enough work undesireable effects are possible. > > CVE's were requested and assigned by the reporter. I unfortunately don't > have them handy :( > > -Dormando Download attachment "signature.asc" of type "application/pgp-signature" (820 bytes)
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