CVE-2019-19726 - Vulnerability Details - OpenCVE

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.

No CVSS v4.0

Attack Vector Local

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction None

No CVSS v3.0

Access Vector Local

Access Complexity Low

Authentication None

Confidentiality Impact Complete

Integrity Impact Complete

Availability Impact Complete

This CVE is not in the KEV list.

Key SSVC decision points have not yet been added.

Vendors	Products
Openbsd	Openbsd

Configuration 1 [-]

cpe:2.3:o:openbsd:openbsd:*:*:*:*:*:*:*:*

No data.

References

Link	Providers
http://packetstormsecurity.com/files/155658/Qualys-Security-Advisory-OpenBSD-Dynamic-Loader-Privilege-Escalation.html
http://packetstormsecurity.com/files/155764/OpenBSD-Dynamic-Loader-chpass-Privilege-Escalation.html
http://packetstormsecurity.com/files/174986/glibc-ld.so-Local-Privilege-Escalation.html
http://seclists.org/fulldisclosure/2019/Dec/31
http://seclists.org/fulldisclosure/2023/Oct/11
http://www.openwall.com/lists/oss-security/2023/10/03/2
https://seclists.org/bugtraq/2019/Dec/25
https://www.openbsd.org/errata66.html
https://www.openwall.com/lists/oss-security/2019/12/11/9

History

No history.

MITRE

Status: PUBLISHED

Assigner: mitre

Published: 2019-12-12T00:00:00

Updated: 2024-08-05T02:25:12.567Z

Reserved: 2019-12-11T00:00:00

Link: CVE-2019-19726

Vulnrichment

No data.

NVD

Status : Modified

Published: 2019-12-12T01:15:10.823

Modified: 2024-11-21T04:35:15.750

Link: CVE-2019-19726

Redhat

No data.

{"dataType": "CVE_RECORD", "dataVersion": "5.1", "cveMetadata": {"state": "PUBLISHED", "cveId": "CVE-2019-19726", "assignerOrgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca", "assignerShortName": "mitre", "dateUpdated": "2024-08-05T02:25:12.567Z", "dateReserved": "2019-12-11T00:00:00", "datePublished": "2019-12-12T00:00:00"}, "containers": {"cna": {"providerMetadata": {"orgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca", "shortName": "mitre", "dateUpdated": "2023-10-06T16:06:13.389413"}, "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."}], "affected": [{"vendor": "n/a", "product": "n/a", "versions": [{"version": "n/a", "status": "affected"}]}], "references": [{"url": "https://www.openbsd.org/errata66.html"}, {"url": "https://www.openwall.com/lists/oss-security/2019/12/11/9"}, {"name": "20191212 Local Privilege Escalation in OpenBSD's dynamic loader (CVE-2019-19726)", "tags": ["mailing-list"], "url": "https://seclists.org/bugtraq/2019/Dec/25"}, {"url": "http://packetstormsecurity.com/files/155658/Qualys-Security-Advisory-OpenBSD-Dynamic-Loader-Privilege-Escalation.html"}, {"name": "20191213 Local Privilege Escalation in OpenBSD's dynamic loader (CVE-2019-19726)", "tags": ["mailing-list"], "url": "http://seclists.org/fulldisclosure/2019/Dec/31"}, {"url": "http://packetstormsecurity.com/files/155764/OpenBSD-Dynamic-Loader-chpass-Privilege-Escalation.html"}, {"name": "[oss-security] 20231003 CVE-2023-4911: Local Privilege Escalation in the glibc's ld.so", "tags": ["mailing-list"], "url": "http://www.openwall.com/lists/oss-security/2023/10/03/2"}, {"name": "20231005 CVE-2023-4911: Local Privilege Escalation in the glibc's ld.so", "tags": ["mailing-list"], "url": "http://seclists.org/fulldisclosure/2023/Oct/11"}, {"url": "http://packetstormsecurity.com/files/174986/glibc-ld.so-Local-Privilege-Escalation.html"}], "problemTypes": [{"descriptions": [{"type": "text", "lang": "en", "description": "n/a"}]}]}, "adp": [{"providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-05T02:25:12.567Z"}, "title": "CVE Program Container", "references": [{"url": "https://www.openbsd.org/errata66.html", "tags": ["x_transferred"]}, {"url": "https://www.openwall.com/lists/oss-security/2019/12/11/9", "tags": ["x_transferred"]}, {"name": "20191212 Local Privilege Escalation in OpenBSD's dynamic loader (CVE-2019-19726)", "tags": ["mailing-list", "x_transferred"], "url": "https://seclists.org/bugtraq/2019/Dec/25"}, {"url": "http://packetstormsecurity.com/files/155658/Qualys-Security-Advisory-OpenBSD-Dynamic-Loader-Privilege-Escalation.html", "tags": ["x_transferred"]}, {"name": "20191213 Local Privilege Escalation in OpenBSD's dynamic loader (CVE-2019-19726)", "tags": ["mailing-list", "x_transferred"], "url": "http://seclists.org/fulldisclosure/2019/Dec/31"}, {"url": "http://packetstormsecurity.com/files/155764/OpenBSD-Dynamic-Loader-chpass-Privilege-Escalation.html", "tags": ["x_transferred"]}, {"name": "[oss-security] 20231003 CVE-2023-4911: Local Privilege Escalation in the glibc's ld.so", "tags": ["mailing-list", "x_transferred"], "url": "http://www.openwall.com/lists/oss-security/2023/10/03/2"}, {"name": "20231005 CVE-2023-4911: Local Privilege Escalation in the glibc's ld.so", "tags": ["mailing-list", "x_transferred"], "url": "http://seclists.org/fulldisclosure/2023/Oct/11"}, {"url": "http://packetstormsecurity.com/files/174986/glibc-ld.so-Local-Privilege-Escalation.html", "tags": ["x_transferred"]}]}]}}

{"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"}]}], "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": ["Third Party Advisory", "VDB Entry"], "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"}, {"source": "cve@mitre.org", "tags": ["Exploit", "Mailing List", "Third Party Advisory"], "url": "http://seclists.org/fulldisclosure/2019/Dec/31"}, {"source": "cve@mitre.org", "url": "http://seclists.org/fulldisclosure/2023/Oct/11"}, {"source": "cve@mitre.org", "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": ["Exploit", "Third Party Advisory", "VDB Entry"], "url": "http://packetstormsecurity.com/files/155658/Qualys-Security-Advisory-OpenBSD-Dynamic-Loader-Privilege-Escalation.html"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory", "VDB Entry"], "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": ["Exploit", "Mailing List", "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"}], "sourceIdentifier": "cve@mitre.org", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-269"}], "source": "nvd@nist.gov", "type": "Primary"}]}