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CVE-2019-7309

Published: 3 February 2019

In the GNU C Library (aka glibc or libc6) through 2.29, the memcmp function for the x32 architecture can incorrectly return zero (indicating that the inputs are equal) because the RDX most significant bit is mishandled.

Notes

AuthorNote
mdeslaur
only affects x32
we will not be fixing this issue in Ubuntu stable releases,
marking as ignored

Priority

Negligible

Cvss 3 Severity Score

5.5

Score breakdown

Status

Package Release Status
eglibc
Launchpad, Ubuntu, Debian
bionic Does not exist

cosmic Does not exist

disco Does not exist

eoan Does not exist

focal Does not exist

trusty Ignored

upstream Needs triage

xenial Does not exist

glibc
Launchpad, Ubuntu, Debian
bionic Ignored

cosmic Ignored
(end of life)
disco Ignored
(end of life)
eoan Not vulnerable
(2.30-0ubuntu2.1)
focal Not vulnerable
(2.31-0ubuntu9)
trusty Does not exist

upstream
Released (2.30)
xenial Ignored

Patches:
upstream: https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=3f635fb43389b54f682fc9ed2acc0b2aaf4a923d (master)
upstream: https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=726a78867b3144e9b9da10197bcf59bde3d8b2a4 (2.29)
upstream: https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=9aaa083387fd1e19eb0bbd9f25444a5d5c91e210 (2.28)
upstream: https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=2ebadb6451eda1d518d70e26cf4ceeb0362e2456 (2.27)
upstream: https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=04e767b59b16befce93c6086362acbc1fae63f4e (2.26)
upstream: https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=2ad78b78d382c5e4bd805334617ac17f35ecff7e (2.25)
upstream: https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=9146dc9d73aba08cf3fc2613a3f946c219dd2a52 (2.24)

Severity score breakdown

Parameter Value
Base score 5.5
Attack vector Local
Attack complexity Low
Privileges required Low
User interaction None
Scope Unchanged
Confidentiality None
Integrity impact None
Availability impact High
Vector CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H