canonical ubuntu-linux CVE-2023-4911 vulnerability in Canonical and Other Products
Published on October 3, 2023

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A buffer overflow was discovered in the GNU C Library's dynamic loader ld.so while processing the GLIBC_TUNABLES environment variable. This issue could allow a local attacker to use maliciously crafted GLIBC_TUNABLES environment variables when launching binaries with SUID permission to execute code with elevated privileges.

NVD

Known Exploited Vulnerability

This GNU C Library Buffer Overflow Vulnerability is part of CISA's list of Known Exploited Vulnerabilities. GNU C Library's dynamic loader ld.so contains a buffer overflow vulnerability when processing the GLIBC_TUNABLES environment variable, allowing a local attacker to execute code with elevated privileges.

The following remediation steps are recommended / required by December 12, 2023: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

Vulnerability Analysis

CVE-2023-4911 can be exploited with local system access, and requires small amount of user privileges. This vulnerability is considered to have a low attack complexity. It has an exploitability score of 1.8 out of four. The potential impact of an exploit of this vulnerability is considered to be very high.

What is a Memory Corruption Vulnerability?

The software writes data past the end, or before the beginning, of the intended buffer. Typically, this can result in corruption of data, a crash, or code execution. The software may modify an index or perform pointer arithmetic that references a memory location that is outside of the boundaries of the buffer. A subsequent write operation then produces undefined or unexpected results.

CVE-2023-4911 has been classified to as a Memory Corruption vulnerability or weakness.


Products Associated with CVE-2023-4911

You can be notified by stack.watch whenever vulnerabilities like CVE-2023-4911 are published in these products:

Canonical Ubuntu Linux
 
GNU Glibc
 
Fedora Project Fedora
 
Red Hat Virtualization
 
Red Hat Enterprise Linux (RHEL)
 
Red Hat Virtualization Host
 
Red Hat Enterprise Linux Server Aus
 
Red Hat Enterprise Linux Server Tus
 
Red Hat Enterprise Linux Eus
 
Red Hat Codeready Linux Builder Power Little Endian Eus
 
Red Hat Codeready Linux Builder Eus
 
Red Hat Codeready Linux Builder Ibm Z Systems Eus
 
Red Hat Codeready Linux Builder Arm64 Eus
 
Red Hat Enterprise Linux Arm 64 Eus
 
Red Hat Enterprise Linux Ibm Z Systems Eus S390x
 
Red Hat Enterprise Linux Power Big Endian Eus
 
Debian Linux
 
Red Hat Codeready Linux Builder Ibm Z Systems
 
Red Hat Codeready Linux Builder Arm64
 
Red Hat Enterprise Linux Power Little Endian Eus
 
Red Hat Codeready Linux Builder Power Little Endian
 
Red Hat Enterprise Linux Server Power Little Endian Update Services Sap Solutions
 
Red Hat Codeready Linux Builder
 
Red Hat Enterprise Linux For Arm 64
 
Red Hat Enterprise Linux Power Little Endian
 
Red Hat Enterprise Linux Ibm Z Systems Eus
 
Red Hat Enterprise Linux Ibm Z Systems
 
NetApp Ontap Select Deploy Administration Utility
 

What versions are vulnerable to CVE-2023-4911?

Each of the following must match for the vulnerability to exist.

Each of the following must match for the vulnerability to exist.

Each of the following must match for the vulnerability to exist.

Each of the following must match for the vulnerability to exist.

Each of the following must match for the vulnerability to exist.