Exploited
high
7.8
CWE
119 787 122
Advisory Published
CVE Published
CVE Published
Updated

CVE-2023-4911: GNU C Library Buffer Overflow Vulnerability

First published: Mon Sep 11 2023(Updated: )

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.

Credit: secalert@redhat.com secalert@redhat.com secalert@redhat.com

Affected SoftwareAffected VersionHow to fix
GNU glibc
Fedoraproject Fedora=37
Fedoraproject Fedora=38
Fedoraproject Fedora=39
Redhat Virtualization=4.0
Redhat Enterprise Linux=8.0
Redhat Enterprise Linux=9.0
ubuntu/glibc<2.35-0ubuntu3.4
2.35-0ubuntu3.4
ubuntu/glibc<2.37-0ubuntu2.1
2.37-0ubuntu2.1
ubuntu/glibc<2.38-1ubuntu6
2.38-1ubuntu6
debian/glibc<=2.31-13+deb11u6
2.28-10+deb10u1
2.28-10+deb10u2
2.31-13+deb11u7
2.36-9+deb12u3
2.37-12
2.37-13
GNU GNU C Library
GNU C Library (glibc)=2.37
GNU C Library (glibc)=2.36
GNU glibc>=2.34<2.39
Redhat Codeready Linux Builder Eus=8.6
Redhat Codeready Linux Builder For Arm64 Eus=8.6
Redhat Codeready Linux Builder For Ibm Z Systems Eus=8.6
Redhat Codeready Linux Builder For Power Little Endian Eus=8.6
Redhat Virtualization Host=4.0
Redhat Enterprise Linux Eus=8.6
Redhat Enterprise Linux For Arm 64 Eus=8.6_aarch64
Redhat Enterprise Linux For Ibm Z Systems Eus S390x=8.6
Redhat Enterprise Linux For Power Big Endian Eus=8.6_ppc64le
Redhat Enterprise Linux Server Aus=8.6
Redhat Enterprise Linux Server Tus=8.6
redhat/glibc<2.39
2.39

Remedy

Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

Remedy

http://www.openwall.com/lists/oss-security/2023/10/03/3

Remedy

https://bugzilla.redhat.com/show_bug.cgi?id=2238352

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Reference Links

Parent vulnerabilities

(Appears in the following advisories)

Peer vulnerabilities

(Found alongside the following vulnerabilities)

Frequently Asked Questions

  • What is CVE-2023-4911?

    CVE-2023-4911 is a vulnerability in the GNU C Library's dynamic loader ld.so, which allows a local attacker to escalate privileges on the system.

  • What is the severity of CVE-2023-4911?

    CVE-2023-4911 has a severity score of 7.8 (High).

  • How does CVE-2023-4911 affect glibc?

    CVE-2023-4911 affects glibc versions 2.35-0ubuntu3.4 and 2.37-0ubuntu2.1 on Ubuntu, and versions 2.28-10+deb10u1, 2.28-10+deb10u2, 2.31-13+deb11u7, and 2.36-9+deb12u3 on Debian.

  • How can a local attacker exploit CVE-2023-4911?

    A local attacker can exploit CVE-2023-4911 by using maliciously crafted GLIBC_TUNABLES environment variables when launching binaries with SUID permission, allowing them to execute arbitrary code.

  • How can I fix CVE-2023-4911?

    To fix CVE-2023-4911, update glibc to the recommended versions provided by the vendor or distribution, such as version 2.35-0ubuntu3.4 for Ubuntu or version 2.31-13+deb11u7 for Debian.

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