CVE-2006-6164 - Vulnerability Details - OpenCVE

The _dl_unsetenv function in loader.c in the ELF ld.so in OpenBSD 3.9 and 4.0 does not properly remove duplicate environment variables, which allows local users to pass dangerous variables such as LD_PRELOAD to loading processes, which might be leveraged to gain privileges.

No CVSS v4.0

No CVSS v3.1

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.

The EPSS score is 0.00047.

Key SSVC decision points have not yet been added.

Vendors	Products
Openbsd	Openbsd

Configuration 1 [-]

OR	cpe:2.3:o:openbsd:openbsd:3.9:::::::*
	cpe:2.3:o:openbsd:openbsd:4.0:::::::*

No data.

No data.

Advisories

Source	ID	Title
EUVD	EUVD-2006-6147	The _dl_unsetenv function in loader.c in the ELF ld.so in OpenBSD 3.9 and 4.0 does not properly remove duplicate environment variables, which allows local users to pass dangerous variables such as LD_PRELOAD to loading processes, which might be leveraged to gain privileges.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References

Link	Providers
http://secunia.com/advisories/22993
http://securitytracker.com/id?1017253
http://www.matasano.com/log/592/finger-79tcp-mcdonald-dowd-and-schuh-challenge-part-2/
http://www.openbsd.org/errata.html#ldso
http://www.openbsd.org/errata39.html#ldso
http://www.securityfocus.com/archive/1/452371/100/0/threaded
http://www.securityfocus.com/archive/1/452428/100/0/threaded
http://www.securityfocus.com/bid/21188
https://exchange.xforce.ibmcloud.com/vulnerabilities/30441

History

No history.

MITRE

Status: PUBLISHED

Assigner: mitre

Published: 2006-11-29T01:00:00

Updated: 2024-08-07T20:19:34.560Z

Reserved: 2006-11-28T00:00:00

Link: CVE-2006-6164

Vulnrichment

No data.

NVD

Status : Deferred

Published: 2006-11-29T01:28:00.000

Modified: 2025-04-09T00:30:58.490

Link: CVE-2006-6164

Redhat

No data.

OpenCVE Enrichment

No data.

{"containers": {"cna": {"affected": [{"product": "n/a", "vendor": "n/a", "versions": [{"status": "affected", "version": "n/a"}]}], "datePublic": "2006-11-19T00:00:00", "descriptions": [{"lang": "en", "value": "The _dl_unsetenv function in loader.c in the ELF ld.so in OpenBSD 3.9 and 4.0 does not properly remove duplicate environment variables, which allows local users to pass dangerous variables such as LD_PRELOAD to loading processes, which might be leveraged to gain privileges."}], "problemTypes": [{"descriptions": [{"description": "n/a", "lang": "en", "type": "text"}]}], "providerMetadata": {"dateUpdated": "2018-10-17T20:57:01", "orgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca", "shortName": "mitre"}, "references": [{"name": "[3.9] 016: SECURITY FIX: November 19, 2006", "tags": ["vendor-advisory", "x_refsource_OPENBSD"], "url": "http://www.openbsd.org/errata39.html#ldso"}, {"tags": ["x_refsource_MISC"], "url": "http://www.matasano.com/log/592/finger-79tcp-mcdonald-dowd-and-schuh-challenge-part-2/"}, {"name": "20061123 Re: Lack of environment sanitization in the FreeBSD, OpenBSD, NetBSD dynamic loaders.", "tags": ["mailing-list", "x_refsource_BUGTRAQ"], "url": "http://www.securityfocus.com/archive/1/452428/100/0/threaded"}, {"name": "22993", "tags": ["third-party-advisory", "x_refsource_SECUNIA"], "url": "http://secunia.com/advisories/22993"}, {"name": "21188", "tags": ["vdb-entry", "x_refsource_BID"], "url": "http://www.securityfocus.com/bid/21188"}, {"name": "[4.0] 005: SECURITY FIX: November 19, 2006", "tags": ["vendor-advisory", "x_refsource_OPENBSD"], "url": "http://www.openbsd.org/errata.html#ldso"}, {"name": "20061122 Lack of environment sanitization in the FreeBSD, OpenBSD, NetBSD dynamic loaders.", "tags": ["mailing-list", "x_refsource_BUGTRAQ"], "url": "http://www.securityfocus.com/archive/1/452371/100/0/threaded"}, {"name": "1017253", "tags": ["vdb-entry", "x_refsource_SECTRACK"], "url": "http://securitytracker.com/id?1017253"}, {"name": "openbsd-elf-privilege-escalation(30441)", "tags": ["vdb-entry", "x_refsource_XF"], "url": "https://exchange.xforce.ibmcloud.com/vulnerabilities/30441"}], "x_legacyV4Record": {"CVE_data_meta": {"ASSIGNER": "cve@mitre.org", "ID": "CVE-2006-6164", "STATE": "PUBLIC"}, "affects": {"vendor": {"vendor_data": [{"product": {"product_data": [{"product_name": "n/a", "version": {"version_data": [{"version_value": "n/a"}]}}]}, "vendor_name": "n/a"}]}}, "data_format": "MITRE", "data_type": "CVE", "data_version": "4.0", "description": {"description_data": [{"lang": "eng", "value": "The _dl_unsetenv function in loader.c in the ELF ld.so in OpenBSD 3.9 and 4.0 does not properly remove duplicate environment variables, which allows local users to pass dangerous variables such as LD_PRELOAD to loading processes, which might be leveraged to gain privileges."}]}, "problemtype": {"problemtype_data": [{"description": [{"lang": "eng", "value": "n/a"}]}]}, "references": {"reference_data": [{"name": "[3.9] 016: SECURITY FIX: November 19, 2006", "refsource": "OPENBSD", "url": "http://www.openbsd.org/errata39.html#ldso"}, {"name": "http://www.matasano.com/log/592/finger-79tcp-mcdonald-dowd-and-schuh-challenge-part-2/", "refsource": "MISC", "url": "http://www.matasano.com/log/592/finger-79tcp-mcdonald-dowd-and-schuh-challenge-part-2/"}, {"name": "20061123 Re: Lack of environment sanitization in the FreeBSD, OpenBSD, NetBSD dynamic loaders.", "refsource": "BUGTRAQ", "url": "http://www.securityfocus.com/archive/1/452428/100/0/threaded"}, {"name": "22993", "refsource": "SECUNIA", "url": "http://secunia.com/advisories/22993"}, {"name": "21188", "refsource": "BID", "url": "http://www.securityfocus.com/bid/21188"}, {"name": "[4.0] 005: SECURITY FIX: November 19, 2006", "refsource": "OPENBSD", "url": "http://www.openbsd.org/errata.html#ldso"}, {"name": "20061122 Lack of environment sanitization in the FreeBSD, OpenBSD, NetBSD dynamic loaders.", "refsource": "BUGTRAQ", "url": "http://www.securityfocus.com/archive/1/452371/100/0/threaded"}, {"name": "1017253", "refsource": "SECTRACK", "url": "http://securitytracker.com/id?1017253"}, {"name": "openbsd-elf-privilege-escalation(30441)", "refsource": "XF", "url": "https://exchange.xforce.ibmcloud.com/vulnerabilities/30441"}]}}}, "adp": [{"providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-07T20:19:34.560Z"}, "title": "CVE Program Container", "references": [{"name": "[3.9] 016: SECURITY FIX: November 19, 2006", "tags": ["vendor-advisory", "x_refsource_OPENBSD", "x_transferred"], "url": "http://www.openbsd.org/errata39.html#ldso"}, {"tags": ["x_refsource_MISC", "x_transferred"], "url": "http://www.matasano.com/log/592/finger-79tcp-mcdonald-dowd-and-schuh-challenge-part-2/"}, {"name": "20061123 Re: Lack of environment sanitization in the FreeBSD, OpenBSD, NetBSD dynamic loaders.", "tags": ["mailing-list", "x_refsource_BUGTRAQ", "x_transferred"], "url": "http://www.securityfocus.com/archive/1/452428/100/0/threaded"}, {"name": "22993", "tags": ["third-party-advisory", "x_refsource_SECUNIA", "x_transferred"], "url": "http://secunia.com/advisories/22993"}, {"name": "21188", "tags": ["vdb-entry", "x_refsource_BID", "x_transferred"], "url": "http://www.securityfocus.com/bid/21188"}, {"name": "[4.0] 005: SECURITY FIX: November 19, 2006", "tags": ["vendor-advisory", "x_refsource_OPENBSD", "x_transferred"], "url": "http://www.openbsd.org/errata.html#ldso"}, {"name": "20061122 Lack of environment sanitization in the FreeBSD, OpenBSD, NetBSD dynamic loaders.", "tags": ["mailing-list", "x_refsource_BUGTRAQ", "x_transferred"], "url": "http://www.securityfocus.com/archive/1/452371/100/0/threaded"}, {"name": "1017253", "tags": ["vdb-entry", "x_refsource_SECTRACK", "x_transferred"], "url": "http://securitytracker.com/id?1017253"}, {"name": "openbsd-elf-privilege-escalation(30441)", "tags": ["vdb-entry", "x_refsource_XF", "x_transferred"], "url": "https://exchange.xforce.ibmcloud.com/vulnerabilities/30441"}]}]}, "cveMetadata": {"assignerOrgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca", "assignerShortName": "mitre", "cveId": "CVE-2006-6164", "datePublished": "2006-11-29T01:00:00", "dateReserved": "2006-11-28T00:00:00", "dateUpdated": "2024-08-07T20:19:34.560Z", "state": "PUBLISHED"}, "dataType": "CVE_RECORD", "dataVersion": "5.1"}

{"configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:openbsd:openbsd:3.9:*:*:*:*:*:*:*", "matchCriteriaId": "F5BB6C5D-4C43-4BB8-B1CE-A70BBE650CA1", "vulnerable": true}, {"criteria": "cpe:2.3:o:openbsd:openbsd:4.0:*:*:*:*:*:*:*", "matchCriteriaId": "CC77812C-D84E-493E-9D21-1BA6C2129E70", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "The _dl_unsetenv function in loader.c in the ELF ld.so in OpenBSD 3.9 and 4.0 does not properly remove duplicate environment variables, which allows local users to pass dangerous variables such as LD_PRELOAD to loading processes, which might be leveraged to gain privileges."}, {"lang": "es", "value": "La funci\u00f3n _dl_unsetenv en loader.c en el ELF ld.so en OpenBSD 3.9 y 4.0 no borra adecuadamente variables de entorno duplicadas, lo cual permite a usuarios locales pasar variables peligrosas como LD_PRELOAD a procesos de carga, lo cual puede ser utilizado para obtener privilegios."}], "id": "CVE-2006-6164", "lastModified": "2025-04-09T00:30:58.490", "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": true, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "source": "nvd@nist.gov", "type": "Primary", "userInteractionRequired": false}]}, "published": "2006-11-29T01:28:00.000", "references": [{"source": "cve@mitre.org", "url": "http://secunia.com/advisories/22993"}, {"source": "cve@mitre.org", "tags": ["Patch"], "url": "http://securitytracker.com/id?1017253"}, {"source": "cve@mitre.org", "url": "http://www.matasano.com/log/592/finger-79tcp-mcdonald-dowd-and-schuh-challenge-part-2/"}, {"source": "cve@mitre.org", "tags": ["Patch"], "url": "http://www.openbsd.org/errata.html#ldso"}, {"source": "cve@mitre.org", "tags": ["Patch"], "url": "http://www.openbsd.org/errata39.html#ldso"}, {"source": "cve@mitre.org", "url": "http://www.securityfocus.com/archive/1/452371/100/0/threaded"}, {"source": "cve@mitre.org", "url": "http://www.securityfocus.com/archive/1/452428/100/0/threaded"}, {"source": "cve@mitre.org", "url": "http://www.securityfocus.com/bid/21188"}, {"source": "cve@mitre.org", "url": "https://exchange.xforce.ibmcloud.com/vulnerabilities/30441"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "http://secunia.com/advisories/22993"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "http://securitytracker.com/id?1017253"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "http://www.matasano.com/log/592/finger-79tcp-mcdonald-dowd-and-schuh-challenge-part-2/"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "http://www.openbsd.org/errata.html#ldso"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "http://www.openbsd.org/errata39.html#ldso"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "http://www.securityfocus.com/archive/1/452371/100/0/threaded"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "http://www.securityfocus.com/archive/1/452428/100/0/threaded"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "http://www.securityfocus.com/bid/21188"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://exchange.xforce.ibmcloud.com/vulnerabilities/30441"}], "sourceIdentifier": "cve@mitre.org", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-Other"}], "source": "nvd@nist.gov", "type": "Primary"}]}