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42 lines
1.7 KiB
YAML
42 lines
1.7 KiB
YAML
id: CVE-2023-4911
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info:
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name: Looney Tunables Linux - Local Privilege Escalation
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author: nybble04
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severity: high
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description: |
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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.
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reference:
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- https://nvd.nist.gov/vuln/detail/CVE-2023-4911
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- https://www.qualys.com/2023/10/03/cve-2023-4911/looney-tunables-local-privilege-escalation-glibc-ld-so.txt
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- https://www.youtube.com/watch?v=1iV-CD9Apn8
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- http://www.openwall.com/lists/oss-security/2023/10/05/1
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- http://www.openwall.com/lists/oss-security/2023/10/13/11
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classification:
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cvss-metrics: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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cvss-score: 7.8
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cve-id: CVE-2023-4911
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cwe-id: CWE-787,CWE-122
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epss-score: 0.78156
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epss-percentile: 0.98452
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cpe: cpe:2.3:a:gnu:glibc:*:*:*:*:*:*:*:*
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metadata:
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max-request: 1
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vendor: gnu
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product: glibc
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tags: cve,cve2023,code,glibc,looneytunables,linux,privesc,local,kev,gnu
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self-contained: true
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code:
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- engine:
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- sh
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- bash
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source: |
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env -i "GLIBC_TUNABLES=glibc.malloc.mxfast=glibc.malloc.mxfast=A" "Z=`printf '%08192x' 1`" /usr/bin/su --help
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echo $?
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matchers:
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- type: word
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words:
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- "139" # Segmentation Fault Exit Code
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# digest: 4a0a0047304502200467c526f6043a379948d8ced51cc69e62cda1e931a681fe275eb9860d715f37022100f445b6a72ea04c499b20fe826724ee120544d715795d1445709b8145a9895277:922c64590222798bb761d5b6d8e72950 |