fkie_cve-2019-19726
Vulnerability from fkie_nvd
Published
2019-12-12 01:15
Modified
2024-11-21 04:35
Severity ?
Summary
OpenBSD through 6.6 allows local users to escalate to root because a check for LD_LIBRARY_PATH in setuid programs can be defeated by setting a very small RLIMIT_DATA resource limit. When executing chpass or passwd (which are setuid root), _dl_setup_env in ld.so tries to strip LD_LIBRARY_PATH from the environment, but fails when it cannot allocate memory. Thus, the attacker is able to execute their own library code as root.
References
{
"configurations": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:openbsd:openbsd:*:*:*:*:*:*:*:*",
"matchCriteriaId": "4586CE9D-A387-4255-8777-F1461913AD2B",
"versionEndIncluding": "6.6",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "OpenBSD through 6.6 allows local users to escalate to root because a check for LD_LIBRARY_PATH in setuid programs can be defeated by setting a very small RLIMIT_DATA resource limit. When executing chpass or passwd (which are setuid root), _dl_setup_env in ld.so tries to strip LD_LIBRARY_PATH from the environment, but fails when it cannot allocate memory. Thus, the attacker is able to execute their own library code as root."
},
{
"lang": "es",
"value": "OpenBSD versiones hasta 6.6, permite a usuarios locales escalar a root porque una comprobaci\u00f3n de LD_LIBRARY_PATH en los programas setuid puede ser vencida estableciendo un l\u00edmite de recursos de RLIMIT_DATA muy peque\u00f1o. Al ejecutar chpass o passwd (que son root de setuid), en la funci\u00f3n _dl_setup_env en el archivo ld.so intenta eliminar LD_LIBRARY_PATH del entorno, pero presenta un fallo cuando no puede asignar memoria. Por lo tanto, el atacante es capaz de ejecutar su propio c\u00f3digo de biblioteca como root."
}
],
"id": "CVE-2019-19726",
"lastModified": "2024-11-21T04:35:15.750",
"metrics": {
"cvssMetricV2": [
{
"acInsufInfo": false,
"baseSeverity": "HIGH",
"cvssData": {
"accessComplexity": "LOW",
"accessVector": "LOCAL",
"authentication": "NONE",
"availabilityImpact": "COMPLETE",
"baseScore": 7.2,
"confidentialityImpact": "COMPLETE",
"integrityImpact": "COMPLETE",
"vectorString": "AV:L/AC:L/Au:N/C:C/I:C/A:C",
"version": "2.0"
},
"exploitabilityScore": 3.9,
"impactScore": 10.0,
"obtainAllPrivilege": false,
"obtainOtherPrivilege": false,
"obtainUserPrivilege": false,
"source": "nvd@nist.gov",
"type": "Primary",
"userInteractionRequired": false
}
],
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 7.8,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"exploitabilityScore": 1.8,
"impactScore": 5.9,
"source": "nvd@nist.gov",
"type": "Primary"
}
]
},
"published": "2019-12-12T01:15:10.823",
"references": [
{
"source": "cve@mitre.org",
"tags": [
"Exploit",
"Third Party Advisory",
"VDB Entry"
],
"url": "http://packetstormsecurity.com/files/155658/Qualys-Security-Advisory-OpenBSD-Dynamic-Loader-Privilege-Escalation.html"
},
{
"source": "cve@mitre.org",
"tags": [
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],
"url": "http://packetstormsecurity.com/files/155764/OpenBSD-Dynamic-Loader-chpass-Privilege-Escalation.html"
},
{
"source": "cve@mitre.org",
"url": "http://packetstormsecurity.com/files/174986/glibc-ld.so-Local-Privilege-Escalation.html"
},
{
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"tags": [
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"url": "http://seclists.org/fulldisclosure/2019/Dec/31"
},
{
"source": "cve@mitre.org",
"url": "http://seclists.org/fulldisclosure/2023/Oct/11"
},
{
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"url": "http://www.openwall.com/lists/oss-security/2023/10/03/2"
},
{
"source": "cve@mitre.org",
"tags": [
"Exploit",
"Mailing List",
"Third Party Advisory"
],
"url": "https://seclists.org/bugtraq/2019/Dec/25"
},
{
"source": "cve@mitre.org",
"tags": [
"Patch",
"Vendor Advisory"
],
"url": "https://www.openbsd.org/errata66.html"
},
{
"source": "cve@mitre.org",
"tags": [
"Mailing List",
"Third Party Advisory"
],
"url": "https://www.openwall.com/lists/oss-security/2019/12/11/9"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
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"url": "http://packetstormsecurity.com/files/155658/Qualys-Security-Advisory-OpenBSD-Dynamic-Loader-Privilege-Escalation.html"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
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],
"url": "http://packetstormsecurity.com/files/155764/OpenBSD-Dynamic-Loader-chpass-Privilege-Escalation.html"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"url": "http://packetstormsecurity.com/files/174986/glibc-ld.so-Local-Privilege-Escalation.html"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
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"Third Party Advisory"
],
"url": "http://seclists.org/fulldisclosure/2019/Dec/31"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"url": "http://seclists.org/fulldisclosure/2023/Oct/11"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"url": "http://www.openwall.com/lists/oss-security/2023/10/03/2"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Exploit",
"Mailing List",
"Third Party Advisory"
],
"url": "https://seclists.org/bugtraq/2019/Dec/25"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Patch",
"Vendor Advisory"
],
"url": "https://www.openbsd.org/errata66.html"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Mailing List",
"Third Party Advisory"
],
"url": "https://www.openwall.com/lists/oss-security/2019/12/11/9"
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],
"sourceIdentifier": "cve@mitre.org",
"vulnStatus": "Modified",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-269"
}
],
"source": "nvd@nist.gov",
"type": "Primary"
}
]
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
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- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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