CVE-2017-11671

NameCVE-2017-11671
DescriptionUnder certain circumstances, the ix86_expand_builtin function in i386.c in GNU Compiler Collection (GCC) version 4.6, 4.7, 4.8, 4.9, 5 before 5.5, and 6 before 6.4 will generate instruction sequences that clobber the status flag of the RDRAND and RDSEED intrinsics before it can be read, potentially causing failures of these instructions to go unreported. This could potentially lead to less randomness in random number generation.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
gcc-4.8 (PTS)jessie4.8.4-1vulnerable
gcc-4.9 (PTS)jessie, jessie (lts)4.9.2-10+deb8u2vulnerable
gcc-6 (PTS)stretch (security), stretch (lts), stretch6.3.0-18+deb9u1fixed

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
gcc-4.6source(unstable)(unfixed)
gcc-4.7source(unstable)(unfixed)
gcc-4.8source(unstable)(unfixed)
gcc-4.9source(unstable)(unfixed)
gcc-5source(unstable)5.4.1-10
gcc-6source(unstable)6.3.0-12

Notes

[jessie] - gcc-4.9 <no-dsa> (Minor issue)
[jessie] - gcc-4.8 <no-dsa> (Minor issue)
[wheezy] - gcc-4.7 <no-dsa> (Minor issue)
[wheezy] - gcc-4.6 <no-dsa> (Minor issue)
http://openwall.com/lists/oss-security/2017/07/27/2
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80180
https://gcc.gnu.org/ml/gcc-patches/2017-03/msg01349.html

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