CVE-2017-12963

NameCVE-2017-12963
DescriptionThere is an illegal address access in Sass::Eval::operator() in eval.cpp of LibSass 3.4.5, leading to a remote denial of service attack. NOTE: this is similar to CVE-2017-11555 but remains exploitable after the vendor's CVE-2017-11555 fix (available from GitHub after 2017-07-24).
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SuSE, Mageia, GitHub code/issues, web search, more)
NVD severitymedium (attack range: remote)
Debian Bugs873034

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
libsass (PTS)stretch3.4.3-1vulnerable
buster, sid3.4.6-1vulnerable

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
libsasssource(unstable)(unfixed)low873034

Notes

[stretch] - libsass <no-dsa> (Minor issue)
https://bugzilla.redhat.com/show_bug.cgi?id=1482335
Similar issue to CVE-2017-11555 but for the issue which remains unfixed
with the upstream patch for CVE-2017-11555.

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