Memory corruption in GNU C Library (glibc) - CVE-2018-11236

Vulnerability identifier: #VU13011

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-2018-11236

CWE-ID: CWE-119

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 vulnerability exists in the stdlib/canonicalize.c source code in the GNU glibc library due to improper processing of long pathname arguments to the realpath function. A local unauthenticated attacker can send long pathname arguments to a targeted system that is using 32-bit architecture, trigger an integer overflow condition that can lead to stack-based buffer overflow condition and execute arbitrary code with elevated privileges.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

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
Red Hat Virtualization Host
openSUSE Leap
libc6 (Ubuntu package)
Dynamic System Analysis (DSA) Preboot
Integrated Management Module II (IMM2) for BladeCenter Systems
System x Integrated Management Module (IMM2)
Flex System Integrated Management Module (IMM2)
Flex System Chassis Management Module (CMM)
Dell EMC Unisphere Central

Install update from vendor's website.

Dynamic System Analysis (DSA) Preboot - update to dsyte2z-9.65
System x Integrated Management Module (IMM2) - update to 1AOO88B-7.20
Flex System Integrated Management Module (IMM2) - update to 1AOO88B-7.20
Integrated Management Module II (IMM2) for BladeCenter Systems - update to 1AOO88B-7.20-bc
Flex System Chassis Management Module (CMM) - update to 2pet16d-2.5.13d
libc6 (Ubuntu package) - addressed in versions 2.23-0ubuntu11.2, 2.27-3ubuntu1.2, 2.30-0ubuntu2.2
Dell EMC Unisphere Central - update to 4.0.8.23220

• https://sourceware.org/bugzilla/show_bug.cgi?id=22786
• https://sourceware.org/git/gitweb.cgi?p=glibc.git&h=5460617d1567657621107d895ee2dd83bc1f88f2

• Privilege escalation in GNU 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
• Multiple vulnerabilities in Dell EMC Unisphere Central
• IBM Dynamic System Analysis (DSA) Preboot update for GNU glibc
• IBM Integrated Management Module II (IMM2) update for GNU glibc
• IBM Flex System Chassis Management Module (CMM) update for GNU glibc
• Ubuntu update for glibc