CVE-2023-4911

GNU C Library Buffer Overflow Vulnerability

Severity Score

7.8

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

Yes

*KEV

Decision

*SSVC

Descriptions

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.

Se descubrió un desbordamiento del búfer en el cargador dinámico ld.so de la librería GNU C mientras se procesaba la variable de entorno GLIBC_TUNABLES. Este problema podría permitir que un atacante local utilice variables de entorno GLIBC_TUNABLES manipuladas con fines malintencionados al iniciar archivos binarios con permiso SUID para ejecutar código con privilegios elevados.

Dubbed Looney Tunables, Qualys discovered a buffer overflow vulnerability in the glibc dynamic loader's processing of the GLIBC_TUNABLES environment variable. This vulnerability was introduced in April 2021 (glibc 2.34) by commit 2ed18c.

GNU C Library's dynamic loader ld.so contains a buffer overflow vulnerability when processing the GLIBC_TUNABLES environment variable, allowing a local attacker to execute code with elevated privileges.

*Credits: Red Hat would like to thank Qualys Research Labs for reporting this issue.

CVSS Scores

NISTv3.1 7.8

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2023-09-12 CVE Reserved
2023-10-03 CVE Published
2023-10-03 First Exploit
2023-11-21 Exploited in Wild
2023-12-12 KEV Due Date
2024-09-16 CVE Updated
2024-09-18 EPSS Updated

CWE

CWE-122: Heap-based Buffer Overflow
CWE-787: Out-of-bounds Write

CAPEC

References (41)

URL	Tag	Source
http://www.openwall.com/lists/oss-security/2023/10/05/1	Mailing List
http://www.openwall.com/lists/oss-security/2023/10/13/11	Mailing List
http://www.openwall.com/lists/oss-security/2023/10/14/3	Mailing List
http://www.openwall.com/lists/oss-security/2023/10/14/5	Mailing List
http://www.openwall.com/lists/oss-security/2023/10/14/6	Third Party Advisory
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/NDAQWHTSVOCOZ5K6KPIWKRT3JX4RTZUR	Mailing List
https://security.gentoo.org/glsa/202310-03	Third Party Advisory
https://security.netapp.com/advisory/ntap-20231013-0006	Mailing List
https://www.debian.org/security/2023/dsa-5514	Third Party Advisory
https://www.qualys.com/cve-2023-4911	Third Party Advisory
https://haxx.in/files/gnu-acme.py
https://security-tracker.debian.org/tracker/CVE-2023-4911
https://ubuntu.com/security/CVE-2023-4911

URL	Date	SRC
https://github.com/leesh3288/CVE-2023-4911	2023-10-04
https://github.com/ruycr4ft/CVE-2023-4911	2023-10-11
https://github.com/guffre/CVE-2023-4911	2023-12-09
https://github.com/NishanthAnand21/CVE-2023-4911-PoC	2024-01-20
https://github.com/RickdeJager/CVE-2023-4911	2023-10-04
https://github.com/hadrian3689/looney-tunables-CVE-2023-4911	2023-10-15
https://github.com/Green-Avocado/CVE-2023-4911	2023-10-05
https://github.com/xiaoQ1z/CVE-2023-4911	2023-10-08
https://github.com/Diego-AltF4/CVE-2023-4911	2023-10-29
https://github.com/KernelKrise/CVE-2023-4911	2023-10-25
https://github.com/yanfernandess/Looney-Tunables-CVE-2023-4911	2024-01-19
https://github.com/puckiestyle/CVE-2023-4911	2023-10-04
http://packetstormsecurity.com/files/174986/glibc-ld.so-Local-Privilege-Escalation.html	2024-02-22
http://packetstormsecurity.com/files/176288/Glibc-Tunables-Privilege-Escalation.html	2024-02-22
http://seclists.org/fulldisclosure/2023/Oct/11	2024-02-22
http://www.openwall.com/lists/oss-security/2023/10/03/2	2024-02-22
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/DFG4P76UHHZEWQ26FWBXG76N2QLKKPZA	2024-02-22
https://www.qualys.com/2023/10/03/cve-2023-4911/looney-tunables-local-privilege-escalation-glibc-ld-so.txt	2024-09-16
https://raw.githubusercontent.com/rapid7/metasploit-framework/master/modules/exploits/linux/local/glibc_tunables_priv_esc.rb	2023-10-03

URL	Date	SRC
http://www.openwall.com/lists/oss-security/2023/10/03/3	2024-02-22
https://bugzilla.redhat.com/show_bug.cgi?id=2238352	2024-01-03

URL	Date	SRC
https://access.redhat.com/errata/RHSA-2023:5453	2024-02-22
https://access.redhat.com/errata/RHSA-2023:5454	2024-02-22
https://access.redhat.com/errata/RHSA-2023:5455	2024-02-22
https://access.redhat.com/errata/RHSA-2023:5476	2024-02-22
https://access.redhat.com/errata/RHSA-2024:0033	2024-02-22
https://access.redhat.com/security/cve/CVE-2023-4911	2024-01-03

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Gnu Search vendor "Gnu"		Glibc Search vendor "Gnu" for product "Glibc"				>= 2.34 < 2.39 Search vendor "Gnu" for product "Glibc" and version " >= 2.34 < 2.39"		-		Affected
Fedoraproject Search vendor "Fedoraproject"		Fedora Search vendor "Fedoraproject" for product "Fedora"				37 Search vendor "Fedoraproject" for product "Fedora" and version "37"		-		Affected
Fedoraproject Search vendor "Fedoraproject"		Fedora Search vendor "Fedoraproject" for product "Fedora"				38 Search vendor "Fedoraproject" for product "Fedora" and version "38"		-		Affected
Fedoraproject Search vendor "Fedoraproject"		Fedora Search vendor "Fedoraproject" for product "Fedora"				39 Search vendor "Fedoraproject" for product "Fedora" and version "39"		-		Affected
Redhat Search vendor "Redhat"		Codeready Linux Builder Eus Search vendor "Redhat" for product "Codeready Linux Builder Eus"				8.6 Search vendor "Redhat" for product "Codeready Linux Builder Eus" and version "8.6"		-		Affected
Redhat Search vendor "Redhat"		Codeready Linux Builder For Arm64 Eus Search vendor "Redhat" for product "Codeready Linux Builder For Arm64 Eus"				8.6 Search vendor "Redhat" for product "Codeready Linux Builder For Arm64 Eus" and version "8.6"		-		Affected
Redhat Search vendor "Redhat"		Codeready Linux Builder For Ibm Z Systems Eus Search vendor "Redhat" for product "Codeready Linux Builder For Ibm Z Systems Eus"				8.6 Search vendor "Redhat" for product "Codeready Linux Builder For Ibm Z Systems Eus" and version "8.6"		-		Affected
Redhat Search vendor "Redhat"		Codeready Linux Builder For Power Little Endian Eus Search vendor "Redhat" for product "Codeready Linux Builder For Power Little Endian Eus"				8.6 Search vendor "Redhat" for product "Codeready Linux Builder For Power Little Endian Eus" and version "8.6"		-		Affected
Redhat Search vendor "Redhat"		Virtualization Search vendor "Redhat" for product "Virtualization"				4.0 Search vendor "Redhat" for product "Virtualization" and version "4.0"		-		Affected
Redhat Search vendor "Redhat"		Virtualization Host Search vendor "Redhat" for product "Virtualization Host"				4.0 Search vendor "Redhat" for product "Virtualization Host" and version "4.0"		-		Affected
Redhat Search vendor "Redhat"		Enterprise Linux Search vendor "Redhat" for product "Enterprise Linux"				8.0 Search vendor "Redhat" for product "Enterprise Linux" and version "8.0"		-		Affected
Redhat Search vendor "Redhat"		Enterprise Linux Search vendor "Redhat" for product "Enterprise Linux"				9.0 Search vendor "Redhat" for product "Enterprise Linux" and version "9.0"		-		Affected
Redhat Search vendor "Redhat"		Enterprise Linux Eus Search vendor "Redhat" for product "Enterprise Linux Eus"				8.6 Search vendor "Redhat" for product "Enterprise Linux Eus" and version "8.6"		-		Affected
Redhat Search vendor "Redhat"		Enterprise Linux For Arm 64 Eus Search vendor "Redhat" for product "Enterprise Linux For Arm 64 Eus"				8.6_aarch64 Search vendor "Redhat" for product "Enterprise Linux For Arm 64 Eus" and version "8.6_aarch64"		-		Affected
Redhat Search vendor "Redhat"		Enterprise Linux For Ibm Z Systems Eus S390x Search vendor "Redhat" for product "Enterprise Linux For Ibm Z Systems Eus S390x"				8.6 Search vendor "Redhat" for product "Enterprise Linux For Ibm Z Systems Eus S390x" and version "8.6"		-		Affected
Redhat Search vendor "Redhat"		Enterprise Linux For Power Big Endian Eus Search vendor "Redhat" for product "Enterprise Linux For Power Big Endian Eus"				8.6_ppc64le Search vendor "Redhat" for product "Enterprise Linux For Power Big Endian Eus" and version "8.6_ppc64le"		-		Affected
Redhat Search vendor "Redhat"		Enterprise Linux Server Aus Search vendor "Redhat" for product "Enterprise Linux Server Aus"				8.6 Search vendor "Redhat" for product "Enterprise Linux Server Aus" and version "8.6"		-		Affected
Redhat Search vendor "Redhat"		Enterprise Linux Server Tus Search vendor "Redhat" for product "Enterprise Linux Server Tus"				8.6 Search vendor "Redhat" for product "Enterprise Linux Server Tus" and version "8.6"		-		Affected