Home/CVE/Under certain circumstances, the ix86_expand_builtin function in i386.c in GNU Compiler Collection (GCC) version 4.6, 4.
CVE

CVE-2017-11671

Under certain circumstances, the ix86_expand_builtin function in i386.c in GNU Compiler Collection (GCC) version 4.6, 4.

Under 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.

MEDIUM · CVSS 4 EPSS 0.00081
Monitor
  • No active-exploitation, high-EPSS, or public-exploit signals - routine patching cadence
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-338Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG)
▤

Affected Products & Versions

1
gnu gccall versions
▣

Scoring & Timeline

4
MEDIUM · CVSS v3.0 · cve@mitre.org
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD26 Jul 2017 · 09:29 PM
CVSS VectorCVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
⚑

Vendor Advisories

4
usnUSN-5770-1
suse-csafSUSE-SU-2017:2526-1
suse-csafSUSE-SU-2017:2380-1
rhsaRHSA-2018:0849Low
🔗

References & Sources

4
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
http://openwall.com/lists/oss-security/2017/07/27/2Mailing ListThird Party Advisory
http://www.securityfocus.com/bid/100018Third Party AdvisoryVDB Entry
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80180Issue TrackingVendor Advisory
https://gcc.gnu.org/ml/gcc-patches/2017-03/msg01349.htmlMailing List
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