Buffer overflow in GNU C Library (glibc) - CVE-2018-11237

Vulnerability identifier: #VU13200

CSH Severity: Low

CVSS v4: 8.5 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2018-11237

CWE-ID: CWE-120

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local attacker to gain elevated privileges on the target system.

The weakness exists due to an AVX-512-optimized implementation of the mempcpy function may write data beyond the target buffer. A local attacker can trigger buffer overflow in __mempcpy_avx512_no_vzeroupper and execute arbitrary code with elevated privileges.

GNU C Library (glibc)
Amazon Linux AMI
Red Hat Enterprise Linux Server
Red Hat Enterprise Linux Workstation
Red Hat Enterprise Linux Desktop
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for Scientific Computing
Red Hat Enterprise Linux for Power
Opensuse
Ubuntu
Fedora
Red Hat Virtualization Host
openSUSE Leap
libc6 (Ubuntu package)
glibc

Install update from vendor's website.

libc6 (Ubuntu package) - addressed in versions 2.23-0ubuntu11.2, 2.27-3ubuntu1.2, 2.30-0ubuntu2.2
glibc - addressed in versions 2.26-30.fc27, 2.27-15.fc28

• https://sourceware.org/ml/libc-alpha/2018-05/msg00713.html

• Privilege escalation in GNU Glibc
• OpenSUSE Linux update for glibc
• OpenSUSE Linux update for glibc
• OpenSUSE Linux update for glibc
• Amazon Linux AMI update for glibc
• Red Hat update for glibc
• OpenSUSE Linux update for procps
• OpenSUSE Linux update for procps
• Ubuntu update for glibc
• Fedora 28 update for glibc
• Fedora 27 update for glibc