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
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
redhat/glibc<2.39
2.39
GNU C Library
GNU C Library=2.37
GNU C Library=2.36
GNU C Library
Fedora=37
Fedora=38
Fedora=39
Red Hat Enterprise Virtualization=4.0
Red Hat Enterprise Linux=8.0
Red Hat Enterprise Linux=9.0
IBM Security Verify Governance - Identity Manager<=ISVG 10.0.2
IBM Security Verify Governance, Identity Manager<=ISVG 10.0.2
GNU C Library>=2.34<2.39
Red Hat CodeReady Linux Builder=9.0
Red Hat CodeReady Linux Builder=8.6
Red Hat CodeReady Linux Builder=9.2
Red Hat CodeReady Linux Builder=9.4
Red Hat CodeReady Linux Builder for ARM 64=9.0_aarch64
Red Hat CodeReady Linux Builder for ARM 64 - Extended Update Support=8.6
Red Hat CodeReady Linux Builder for ARM 64 - Extended Update Support=9.2_aarch64
Red Hat CodeReady Linux Builder for ARM 64 - Extended Update Support=9.4_aarch64
Red Hat CodeReady Linux Builder for IBM z Systems=9.0_s390x
Red Hat CodeReady Linux Builder for IBM z Systems - Extended Update Support=8.6
Red Hat CodeReady Linux Builder for IBM z Systems - Extended Update Support=9.2_s390x
Red Hat CodeReady Linux Builder for IBM z Systems - Extended Update Support=9.4_s390x
Red Hat CodeReady Linux Builder for Power, little endian=9.0_ppc64le
Red Hat CodeReady Linux Builder for Power, little endian=8.6
Red Hat CodeReady Linux Builder for Power, little endian=9.2_ppc64le
Red Hat CodeReady Linux Builder for Power, little endian=9.4_ppc64le
Red Hat Virtualization Host EUS=4.0
Red Hat Enterprise Linux Server EUS=8.6
Red Hat Enterprise Linux Server EUS=9.2
Red Hat Enterprise Linux Server EUS=9.4
Red Hat Enterprise Linux=9.0_aarch64
Red Hat Enterprise Linux for ARM64 EUS=8.6_aarch64
Red Hat Enterprise Linux for ARM64 EUS=9.2_aarch64
Red Hat Enterprise Linux for ARM64 EUS=9.4_aarch64
Red Hat Enterprise Linux for IBM Z Systems=9.0_s390x
Red Hat Enterprise Linux for IBM Z Systems (s390x)=9.2_s390x
Red Hat Enterprise Linux for IBM Z Systems (s390x)=9.4_s390x
Red Hat Enterprise Linux for IBM Z Systems (s390x)=8.6
Red Hat Enterprise Linux for Power, Big Endian EUS=8.6_ppc64le
Red Hat Enterprise Linux for Power, little endian=9.0_ppc64le
Red Hat Enterprise Linux for Power, little endian - Extended Update Support=9.2_ppc64le
Red Hat Enterprise Linux for Power, little endian - Extended Update Support=9.4_ppc64le
Red Hat Enterprise Linux Server=8.6
Red Hat Enterprise Linux Server=9.2
Red Hat Enterprise Linux Server=9.4
Red Hat Enterprise Linux for SAP Applications for Power, little endian - Extended Update Support=9.2_ppc64le
Red Hat Enterprise Linux for SAP Applications for Power, little endian - Extended Update Support=9.4_ppc64le
Red Hat Enterprise Linux Server=8.6
Ubuntu Linux=22.04
Ubuntu Linux=23.04
Debian=11.0
Debian=12.0
All of
NetApp H410C Firmware
NetApp H410C
All of
NetApp H300S Firmware
NetApp H300S
All of
NetApp H500S Firmware
NetApp H500s
All of
NetApp H700S
NetApp H700S
All of
NetApp H410S Firmware
NetApp H410S Firmware
NetApp ONTAP Select Deploy
GNU C Library (glibc)>=2.34<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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