CVE-2023-4911
GNU C Library Buffer Overflow Vulnerability
Does this matter?
Known to be exploited in the wild (CISA KEV, CISA remediation deadline 12 December 2023). Treat as an emergency change: patch or isolate now, then hunt for prior compromise.
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.
- CVSS 3.1
- 7.8 HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 81.42% probability · 100th percentile
- CISA KEV
- Listed 21 November 2023 · due 12 December 2023
- Weakness
- CWE-122, CWE-787
- Affected
- netapp/bootstrap os · siemens/simatic s7-1500 cpu 1518-4 pn\/dp mfp firmware · siemens/simatic s7-1500 cpu 1518f-4 pn\/dp mfp firmware · siemens/siplus s7-1500 cpu 1518-4 pn\/dp mfp firmware · siemens/simatic s7-1500 tm mfp firmware · gnu/glibc · fedoraproject/fedora · redhat/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/virtualization · redhat/virtualization host · redhat/enterprise linux · redhat/enterprise linux eus · redhat/enterprise linux for arm 64 · +19 more
- Source
- secalert@redhat.com
CISA notes
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable. This vulnerability affects a common open-source component, third-party library, or a protocol used by different products. Please check with specific vendors for information on patching status. For more information, please see: https://sourceware.org/git/?p=glibc.git;a=commitdiff;h=1056e5b4c3f2d90ed2b4a55f96add28da2f4c8fa, https://access.redhat.com/security/cve/cve-2023-4911, https://www.debian.org/security/2023/dsa-5514 ; https://nvd.nist.gov/vuln/detail/CVE-2023-4911
References
- https://access.redhat.com/errata/RHSA-2023:5453Third Party Advisory
- https://access.redhat.com/errata/RHSA-2023:5454Third Party Advisory
- https://access.redhat.com/errata/RHSA-2023:5455Third Party Advisory
- https://access.redhat.com/errata/RHSA-2023:5476Third Party Advisory
- https://access.redhat.com/errata/RHSA-2024:0033Third Party Advisory
- https://access.redhat.com/security/cve/CVE-2023-4911Third Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2238352Issue Tracking, Patch
- https://www.qualys.com/2023/10/03/cve-2023-4911/looney-tunables-local-privilege-escalation-glibc-ld-so.txtExploit, Third Party Advisory
- https://www.qualys.com/cve-2023-4911/Third Party Advisory
- http://packetstormsecurity.com/files/174986/glibc-ld.so-Local-Privilege-Escalation.htmlExploit, Third Party Advisory, VDB Entry
- http://packetstormsecurity.com/files/176288/Glibc-Tunables-Privilege-Escalation.htmlExploit, Third Party Advisory, VDB Entry
- http://seclists.org/fulldisclosure/2023/Oct/11Exploit, Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2023/10/03/2Exploit, Mailing List
- http://www.openwall.com/lists/oss-security/2023/10/03/3Mailing List
- http://www.openwall.com/lists/oss-security/2023/10/05/1Mailing List
- http://www.openwall.com/lists/oss-security/2023/10/13/11Mailing List
- http://www.openwall.com/lists/oss-security/2023/10/14/3Mailing List
- http://www.openwall.com/lists/oss-security/2023/10/14/5Mailing List
- http://www.openwall.com/lists/oss-security/2023/10/14/6Mailing List
- https://access.redhat.com/errata/RHSA-2023:5453Third Party Advisory
- https://access.redhat.com/errata/RHSA-2023:5454Third Party Advisory
- https://access.redhat.com/errata/RHSA-2023:5455Third Party Advisory
- https://access.redhat.com/errata/RHSA-2023:5476Third Party Advisory
- https://access.redhat.com/errata/RHSA-2024:0033Third Party Advisory
- https://access.redhat.com/security/cve/CVE-2023-4911Third Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2238352Issue Tracking, Patch
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/4DBUQRRPB47TC3NJOUIBVWUGFHBJAFDL/Mailing List
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/DFG4P76UHHZEWQ26FWBXG76N2QLKKPZA/Mailing List
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/NDAQWHTSVOCOZ5K6KPIWKRT3JX4RTZUR/Mailing List
- https://security.gentoo.org/glsa/202310-03Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.