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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 Severity Score

5.5

Score breakdown

Status

Package Release Status
eglibc
Launchpad, Ubuntu, Debian
precise
Released (2.15-0ubuntu10.14)
trusty
Released (2.19-0ubuntu6.8)
upstream Needed

vivid Does not exist

wily Does not exist

xenial Does not exist

yakkety Does not exist

zesty Does not exist

glibc
Launchpad, Ubuntu, Debian
precise Does not exist

trusty Does not exist

upstream
Released (2.21-6)
vivid Ignored
(end of life)
wily
Released (2.21-0ubuntu4.2)
xenial Not vulnerable
(2.23-0ubuntu1)
yakkety Not vulnerable
(2.23-0ubuntu1)
zesty Not vulnerable
(2.23-0ubuntu1)
Patches:
upstream: https://sourceware.org/git/gitweb.cgi?p=glibc.git;a=commit;h=a014cecd82b71b70a6a843e250e06b541ad524f7

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 High
Availability impact None
Vector CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N