Arch Linux Security Advisory ASA-201801-19

Severity: High
Date : 2018-01-28
CVE-ID : CVE-2018-1000001
Package : lib32-glibc
Type : privilege escalation
Remote : No
Link : https://security.archlinux.org/AVG-590

Summary

The package lib32-glibc before version 2.26-11 is vulnerable to
privilege escalation.

Resolution

Upgrade to 2.26-11.

pacman -Syu “lib32-glibc>=2.26-11”

The problem has been fixed upstream but no release is available yet.

Workaround

None.

Description

A buffer underflow vulnerability has been discovered in the realpath()
function in glibc 2.26 when getcwd() returns a relative or unreachable
path (i.e. not starting with ‘/’) which may allow privilege escalation
under certain conditions.

Impact

A local attacker is able to escalate privileges on the affected host.

References

http://www.openwall.com/lists/oss-security/2018/01/11/5
https://sourceware.org/bugzilla/show_bug.cgi?id=22679
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=52a713fdd0a30e1bd79818e2e3c4ab44ddca1a94
https://security.archlinux.org/CVE-2018-1000001