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CVE-2015-8777

Published: 20 January 2016

The process_envvars function in elf/rtld.c in the GNU C Library (aka glibc or libc6) before 2.23 allows local users to bypass a pointer-guarding protection mechanism via a zero value of the LD_POINTER_GUARD environment variable.

From the Ubuntu security team

Hector Marco and Ismael Ripoll discovered that the GNU C Library allowed the pointer-guarding protection mechanism to be disabled by honoring the LD_POINTER_GUARD environment variable across privilege boundaries. An local attacker could use this to exploit an existing vulnerability more easily.

Priority

Low

CVSS 3 base score: 5.5

Status

Package Release Status
eglibc
Launchpad, Ubuntu, Debian
Upstream Needed

Ubuntu 16.04 ESM (Xenial Xerus) Does not exist

Ubuntu 14.04 ESM (Trusty Tahr)
Released (2.19-0ubuntu6.8)
glibc
Launchpad, Ubuntu, Debian
Upstream
Released (2.21-6)
Ubuntu 16.04 ESM (Xenial Xerus) Not vulnerable
(2.23-0ubuntu1)
Ubuntu 14.04 ESM (Trusty Tahr) Does not exist

Patches:
Upstream: https://sourceware.org/git/gitweb.cgi?p=glibc.git;a=commit;h=a014cecd82b71b70a6a843e250e06b541ad524f7