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.
Published 2023-10-03 18:15:10
Updated 2024-09-17 19:46:46
Source Red Hat, Inc.
View at NVD,   CVE.org
Vulnerability category: OverflowExecute code

Products affected by CVE-2023-4911

CVE-2023-4911 is in the CISA Known Exploited Vulnerabilities Catalog

CISA vulnerability name:
GNU C Library Buffer Overflow Vulnerability
CISA required action:
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
CISA description:
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.
Notes:
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=1056e5b4c3f2d90ed2
Added on 2023-11-21 Action due date 2023-12-12

Exploit prediction scoring system (EPSS) score for CVE-2023-4911

3.29%
Probability of exploitation activity in the next 30 days EPSS Score History
~ 92 %
Percentile, the proportion of vulnerabilities that are scored at or less

Metasploit modules for CVE-2023-4911

  • Glibc Tunables Privilege Escalation CVE-2023-4911 (aka Looney Tunables)
    Disclosure Date: 2023-10-03
    First seen: 2024-01-23
    exploit/linux/local/glibc_tunables_priv_esc
    A buffer overflow exists in the GNU C Library's dynamic loader ld.so while processing the GLIBC_TUNABLES environment variable. This issue allows an local attacker to use maliciously crafted GLIBC_TUNABLES when launching binaries with SUID permission to execute code in

CVSS scores for CVE-2023-4911

Base Score Base Severity CVSS Vector Exploitability Score Impact Score Score Source First Seen
7.8
HIGH CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
1.8
5.9
NIST
7.8
HIGH CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
1.8
5.9
Red Hat, Inc.
7.8
HIGH CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
N/A
N/A
RedHat-CVE-2023-4911

CWE ids for CVE-2023-4911

  • A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc().
    Assigned by: secalert@redhat.com (Secondary)
  • The product writes data past the end, or before the beginning, of the intended buffer.
    Assigned by: nvd@nist.gov (Primary)

References for CVE-2023-4911

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