CVE-2023-4911
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.
- Score
- CVSS 3.1 7.8 High
- Status
- Analyzed - secalert@redhat.com
- Published
- 2023-10-03
- Last modified
- 2026-10-14
- Known exploited (CISA KEV)
- since 2023-11-21, action due 2023-12-12: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
- Weaknesses
- CWE-122, CWE-787
Affected products
- Ubuntu Linux (Canonical)
- Debian Linux (Debian)
- Fedora (Fedoraproject)
- Glibc (Gnu)
- Bootstrap Os (Netapp)
- H300s Firmware (Netapp)
- H410c Firmware (Netapp)
- H410s Firmware (Netapp)
- H500s Firmware (Netapp)
- H700s Firmware (Netapp)
- Ontap Select Deploy Administration Utility (Netapp)
- Codeready Linux Builder (Redhat)
- Codeready Linux Builder Eus (Redhat)
- Codeready Linux Builder For Arm64 (Redhat)
- Codeready Linux Builder For Arm64 Eus (Redhat)
- Codeready Linux Builder For Ibm Z Systems (Redhat)
- Codeready Linux Builder For Ibm Z Systems Eus (Redhat)
- Codeready Linux Builder For Power Little Endian (Redhat)
- Codeready Linux Builder For Power Little Endian Eus (Redhat)
- Enterprise Linux (Redhat)
- Enterprise Linux Eus (Redhat)
- Enterprise Linux For Arm 64 (Redhat)
- Enterprise Linux For Arm 64 Eus (Redhat)
- Enterprise Linux For Ibm Z Systems (Redhat)
- Enterprise Linux For Ibm Z Systems Eus (Redhat)
- Enterprise Linux For Ibm Z Systems Eus S390x (Redhat)
- Enterprise Linux For Power Big Endian Eus (Redhat)
- Enterprise Linux For Power Little Endian (Redhat)
- Enterprise Linux For Power Little Endian Eus (Redhat)
- Enterprise Linux Server Aus (Redhat)
- Enterprise Linux Server For Power Little Endian Update Services For Sap Solutions (Redhat)
- Enterprise Linux Server Tus (Redhat)
- Enterprise Linux Update Services For Sap Solutions (Redhat)
- Rhel Eus (Redhat)
- Rhev Hypervisor (Redhat)
- Virtualization (Redhat)
- Virtualization Host (Redhat)
- Simatic S7-1500 Cpu 1518-4 Pn/dp Mfp Firmware (Siemens)
- Simatic S7-1500 Cpu 1518-4 Pndp Mfp (Siemens)
- Simatic S7-1500 Cpu 1518f-4 Pn/dp Mfp Firmware (Siemens)
- Simatic S7-1500 Cpu 1518f-4 Pndp Mfp (Siemens)
- Simatic S7-1500 Tm Mfp - Gnulinux Subsystem (Siemens)
- Simatic S7-1500 Tm Mfp Firmware (Siemens)
- Siplus S7-1500 Cpu 1518-4 Pn/dp Mfp Firmware (Siemens)
- Siplus S7-1500 Cpu 1518-4 Pndp Mfp (Siemens)
References
- https://access.redhat.com/errata/RHSA-2023:5453
- https://access.redhat.com/errata/RHSA-2023:5454
- https://access.redhat.com/errata/RHSA-2023:5455
- https://access.redhat.com/errata/RHSA-2023:5476
- https://access.redhat.com/errata/RHSA-2024:0033
- https://access.redhat.com/security/cve/CVE-2023-4911
- https://bugzilla.redhat.com/show_bug.cgi?id=2238352
- https://www.qualys.com/2023/10/03/cve-2023-4911/looney-tunables-local-privilege-escalation-glibc-ld-so.txt
- https://www.qualys.com/cve-2023-4911/
- https://www.exploit-db.com/exploits/52479
- http://packetstormsecurity.com/files/174986/glibc-ld.so-Local-Privilege-Escalation.html
- http://packetstormsecurity.com/files/176288/Glibc-Tunables-Privilege-Escalation.html
- http://seclists.org/fulldisclosure/2023/Oct/11
- http://www.openwall.com/lists/oss-security/2023/10/03/2
- http://www.openwall.com/lists/oss-security/2023/10/03/3
- http://www.openwall.com/lists/oss-security/2023/10/05/1
- http://www.openwall.com/lists/oss-security/2023/10/13/11
- http://www.openwall.com/lists/oss-security/2023/10/14/3
- http://www.openwall.com/lists/oss-security/2023/10/14/5
- http://www.openwall.com/lists/oss-security/2023/10/14/6
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/4DBUQRRPB47TC3NJOUIBVWUG…
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/DFG4P76UHHZEWQ26FWBXG76N…
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/NDAQWHTSVOCOZ5K6KPIWKRT3…
- https://security.gentoo.org/glsa/202310-03
- https://security.netapp.com/advisory/ntap-20231013-0006/
- https://www.debian.org/security/2023/dsa-5514
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-4911
- https://cert-portal.siemens.com/productcert/html/ssa-831302.html
- https://cert-portal.siemens.com/productcert/html/ssa-794697.html
- https://cert-portal.siemens.com/productcert/html/ssa-082556.html
