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id : CVE-2023-4911
info :
2023-11-07 09:04:06 +00:00
name : Looney Tunables Linux - Local Privilege Escalation
2023-10-26 14:04:37 +00:00
author : nybble04
severity : high
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.
reference :
- https://nvd.nist.gov/vuln/detail/CVE-2023-4911
- https://www.qualys.com/2023/10/03/cve-2023-4911/looney-tunables-local-privilege-escalation-glibc-ld-so.txt
- https://www.youtube.com/watch?v=1iV-CD9Apn8
classification :
cvss-metrics : CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
cvss-score : 7.8
cve-id : CVE-2023-4911
cwe-id : CWE-787
cpe : cpe:2.3:a:gnu:glibc:-:*:*:*:*:*:*:*
metadata :
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max-request : 1
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vendor : glibc
2023-11-07 09:04:06 +00:00
tags : cve,cve2023,glibc,looneytunables,linux,privesc,local
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self-contained : true
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code :
- engine :
- sh
- bash
source : |
env -i "GLIBC_TUNABLES=glibc.malloc.mxfast=glibc.malloc.mxfast=A" "Z=`printf '%08192x' 1`" /usr/bin/su --help
echo $?
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matchers :
- type : word
words :
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- "139" # Segmentation Fault Exit Code
2023-11-07 14:25:13 +00:00
# digest: 490a0046304402201719449500de78562751e6fa107a395190764f89a1711df4b18f1a3bc537855602205a04095c8ca4b9380d43892c0c115cc3dca7b4e2e7e494e355f3bfd08166df0b:922c64590222798bb761d5b6d8e72950
