CVE-2023-4911
Glibc: buffer overflow in ld.so leading to privilege escalation
At a glance
- Severity
- HIGH 7.8
- Exploitation
- Known exploited (CISA KEV) · added 2023-11-21
Exploited per ENISA since 2023-11-21 - EPSS
- EPSS 63.77 % · percentile 99 (2026-10-27)
- State
- PUBLISHED
- Published
- Updated
- Assigner
- redhat
- NVD status
- Analyzed
Description
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.
Scores
| Version | Score | Vector | Scored by |
|---|---|---|---|
| CVSS 3.1 | HIGH 7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H | redhat |
| CVSS 3.1 | HIGH 7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H | NVD · secalert@redhat.com (Secondary) |
| CVSS 3.1 | HIGH 7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H | NVD · nvd@nist.gov (Primary) |
Weaknesses (CWE)
European references
- ENISA EUVD · EUVD-2023-54750
- GCVE · GCVE-0-2023-4911
CERT-FR advisories
- CERTFR-2026-AVI-1385 — Multiples vulnérabilités dans les produits VMware · cert.ssi.gouv.fr
- CERTFR-2026-AVI-0218 — Multiples vulnérabilités dans les produits VMware · cert.ssi.gouv.fr
- CERTFR-2025-AVI-0969 — Multiples vulnérabilités dans les produits VMware · cert.ssi.gouv.fr
- CERTFR-2025-AVI-0855 — Multiples vulnérabilités dans les produits Juniper Networks · cert.ssi.gouv.fr
- CERTFR-2025-AVI-0756 — Multiples vulnérabilités dans les produits VMware · cert.ssi.gouv.fr
- CERTFR-2025-AVI-0492 — Multiples vulnérabilités dans les produits Siemens · cert.ssi.gouv.fr
- CERTFR-2023-AVI-1015 — Multiples vulnérabilités dans les produits Siemens · cert.ssi.gouv.fr
- CERTFR-2023-AVI-0957 — Multiples vulnérabilités dans le noyau Linux de RedHat · cert.ssi.gouv.fr
- CERTFR-2023-AVI-0804 — Vulnérabilité dans GNU LIBC · cert.ssi.gouv.fr
Affected configurations (NVD CPE)
cpe:2.3:o:netapp:bootstrap_os:-:*:*:*:*:*:*:*cpe:2.3:o:siemens:simatic_s7-1500_cpu_1518-4_pn\/dp_mfp_firmware:*:*:*:*:*:*:*:*≥ 3.1.5cpe:2.3:o:siemens:simatic_s7-1500_cpu_1518f-4_pn\/dp_mfp_firmware:*:*:*:*:*:*:*:*≥ 3.1.5cpe:2.3:o:siemens:siplus_s7-1500_cpu_1518-4_pn\/dp_mfp_firmware:*:*:*:*:*:*:*:*≥ 3.1.5cpe:2.3:o:siemens:simatic_s7-1500_tm_mfp_firmware:*:*:*:*:*:*:*:*< 1.1cpe:2.3:a:gnu:glibc:*:*:*:*:*:*:*:*≥ 2.34 < 2.39cpe:2.3:o:fedoraproject:fedora:37:*:*:*:*:*:*:*cpe:2.3:o:fedoraproject:fedora:38:*:*:*:*:*:*:*cpe:2.3:o:fedoraproject:fedora:39:*:*:*:*:*:*:*cpe:2.3:a:redhat:codeready_linux_builder:9.0:*:*:*:*:*:*:*cpe:2.3:a:redhat:codeready_linux_builder_eus:8.6:*:*:*:*:*:*:*cpe:2.3:a:redhat:codeready_linux_builder_eus:9.2:*:*:*:*:*:*:*cpe:2.3:a:redhat:codeready_linux_builder_eus:9.4:*:*:*:*:*:*:*cpe:2.3:a:redhat:codeready_linux_builder_eus:9.6:*:*:*:*:*:*:*cpe:2.3:a:redhat:codeready_linux_builder_for_arm64:9.0_aarch64:*:*:*:*:*:*:*cpe:2.3:a:redhat:codeready_linux_builder_for_arm64_eus:8.6:*:*:*:*:*:*:*cpe:2.3:a:redhat:codeready_linux_builder_for_arm64_eus:9.2_aarch64:*:*:*:*:*:*:*cpe:2.3:a:redhat:codeready_linux_builder_for_arm64_eus:9.4_aarch64:*:*:*:*:*:*:*cpe:2.3:a:redhat:codeready_linux_builder_for_arm64_eus:9.6_aarch64:*:*:*:*:*:*:*cpe:2.3:a:redhat:codeready_linux_builder_for_ibm_z_systems:9.0_s390x:*:*:*:*:*:*:*cpe:2.3:a:redhat:codeready_linux_builder_for_ibm_z_systems_eus:8.6:*:*:*:*:*:*:*cpe:2.3:a:redhat:codeready_linux_builder_for_ibm_z_systems_eus:9.2_s390x:*:*:*:*:*:*:*cpe:2.3:a:redhat:codeready_linux_builder_for_ibm_z_systems_eus:9.4_s390x:*:*:*:*:*:*:*cpe:2.3:a:redhat:codeready_linux_builder_for_ibm_z_systems_eus:9.6_s390x:*:*:*:*:*:*:*cpe:2.3:a:redhat:codeready_linux_builder_for_power_little_endian:9.0_ppc64le:*:*:*:*:*:*:*cpe:2.3:a:redhat:codeready_linux_builder_for_power_little_endian_eus:8.6:*:*:*:*:*:*:*cpe:2.3:a:redhat:codeready_linux_builder_for_power_little_endian_eus:9.2_ppc64le:*:*:*:*:*:*:*cpe:2.3:a:redhat:codeready_linux_builder_for_power_little_endian_eus:9.4_ppc64le:*:*:*:*:*:*:*cpe:2.3:a:redhat:codeready_linux_builder_for_power_little_endian_eus:9.6_ppc64le:*:*:*:*:*:*:*cpe:2.3:a:redhat:virtualization:4.0:*:*:*:*:*:*:*cpe:2.3:a:redhat:virtualization_host:4.0:*:*:*:*:*:*:*cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*cpe:2.3:o:redhat:enterprise_linux:9.0:*:*:*:*:*:*:*cpe:2.3:o:redhat:enterprise_linux_eus:8.6:*:*:*:*:*:*:*cpe:2.3:o:redhat:enterprise_linux_eus:9.2:*:*:*:*:*:*:*cpe:2.3:o:redhat:enterprise_linux_eus:9.4:*:*:*:*:*:*:*cpe:2.3:o:redhat:enterprise_linux_eus:9.6:*:*:*:*:*:*:*cpe:2.3:o:redhat:enterprise_linux_for_arm_64:9.0_aarch64:*:*:*:*:*:*:*cpe:2.3:o:redhat:enterprise_linux_for_arm_64_eus:8.6_aarch64:*:*:*:*:*:*:*cpe:2.3:o:redhat:enterprise_linux_for_arm_64_eus:9.2_aarch64:*:*:*:*:*:*:*- +33 more
Affected products
| Product | Versions |
|---|---|
| glibc | affected 2.34 < 2.39 |
| Red Hat · Red Hat Enterprise Linux 8 | unaffected 0:2.28-225.el8_8.6 < * |
| Red Hat · Red Hat Enterprise Linux 8 | unaffected 0:2.28-225.el8_8.6 < * |
| Red Hat · Red Hat Enterprise Linux 8.6 Extended Update Support | unaffected 0:2.28-189.6.el8_6 < * |
| Red Hat · Red Hat Enterprise Linux 9 | unaffected 0:2.34-60.el9_2.7 < * |
| Red Hat · Red Hat Enterprise Linux 9 | unaffected 0:2.34-60.el9_2.7 < * |
| Red Hat · Red Hat Enterprise Linux 9.0 Extended Update Support | unaffected 0:2.34-28.el9_0.4 < * |
| Red Hat · Red Hat Virtualization 4 for Red Hat Enterprise Linux 8 | unaffected 0:2.28-189.6.el8_6 < * |
| Red Hat · Red Hat Virtualization 4 for Red Hat Enterprise Linux 8 | unaffected 0:4.5.3-10.el8ev < * |
| Red Hat · Red Hat Virtualization 4 for Red Hat Enterprise Linux 8 | unaffected 0:4.5.3-202312060823_8.6 < * |
| Red Hat · Red Hat Enterprise Linux 6 | |
| Red Hat · Red Hat Enterprise Linux 7 | |
| Red Hat · Red Hat Enterprise Linux 7 |
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/4DBUQRRPB47TC3NJOUIBVWUGFHBJAFDL/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/DFG4P76UHHZEWQ26FWBXG76N2QLKKPZA/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/NDAQWHTSVOCOZ5K6KPIWKRT3JX4RTZUR/
- 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
Sources
| Source | Licence |
|---|---|
| CVE List (CVEProject cvelistV5) | CVE Program Terms of Use |
| CISA Known Exploited Vulnerabilities | CC0 1.0 |
| EPSS (FIRST.org) | FIRST — attribution requested |
| ENISA EUVD | ENISA — reproduction authorised, source acknowledged |
| CERT-FR (ANSSI) | Licence Ouverte / Etalab 2.0 |
| NVD (NIST) via fkie-cad/nvd-json-data-feeds | Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD |