CVE-2019-19521

libc in OpenBSD 6.6 allows authentication bypass via the -schallenge username, as demonstrated by smtpd, ldapd, or radiusd. This is related to gen/auth_subr.c and gen/authenticate.c in libc (and login/login.c and xenocara/app/xenodm/greeter/verify.c).

CVSS v3.0 9.8 CRITICAL
CVSS v2.0 7.5 HIGH

9.8^/10

CVSS v3.0 : CRITICAL

Vector :

Exploitability : 3.9 / Impact : 5.9

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

7.5^/10

CVSS v2.0 : HIGH

Vector : AV:N/AC:L/Au:N/C:P/I:P/A:P

Exploitability : 10.0 / Impact : 6.4

Access Vector NETWORK

Access Complexity LOW

Authentication NONE

Confidentiality Impact PARTIAL

Integrity Impact PARTIAL

Availability Impact PARTIAL

References

Link	Resource
https://www.openbsd.org/errata66.html	Vendor Advisory
https://www.openwall.com/lists/oss-security/2019/12/04/5	Exploit Mailing List Third Party Advisory
http://www.openwall.com/lists/oss-security/2019/12/04/6	Mailing List
http://www.openwall.com/lists/oss-security/2019/12/04/5	Exploit Mailing List Third Party Advisory
https://seclists.org/bugtraq/2019/Dec/8	Exploit Mailing List Third Party Advisory
http://packetstormsecurity.com/files/155572/Qualys-Security-Advisory-OpenBSD-Authentication-Bypass-Privilege-Escalation.html	Third Party Advisory
http://seclists.org/fulldisclosure/2019/Dec/14	Third Party Advisory

Advertisement

Configurations

Configuration 1 (hide)

cpe:2.3:o:openbsd:openbsd:6.6:*:*:*:*:*:*:*

Information

Published : 2019-12-04 16:15

Updated : 2019-12-12 07:55

NVD link : CVE-2019-19521

Mitre link : CVE-2019-19521

JSON object : View

CWE

CWE-287

Improper Authentication

Advertisement

Products Affected

openbsd

openbsd

{"cve": {"data_type": "CVE", "references": {"reference_data": [{"url": "https://www.openbsd.org/errata66.html", "name": "https://www.openbsd.org/errata66.html", "tags": ["Vendor Advisory"], "refsource": "MISC"}, {"url": "https://www.openwall.com/lists/oss-security/2019/12/04/5", "name": "https://www.openwall.com/lists/oss-security/2019/12/04/5", "tags": ["Exploit", "Mailing List", "Third Party Advisory"], "refsource": "MISC"}, {"url": "http://www.openwall.com/lists/oss-security/2019/12/04/6", "name": "[oss-security] 20191204 Re: Authentication vulnerabilities in OpenBSD", "tags": ["Mailing List"], "refsource": "MLIST"}, {"url": "http://www.openwall.com/lists/oss-security/2019/12/04/5", "name": "[oss-security] 20191204 Authentication vulnerabilities in OpenBSD", "tags": ["Exploit", "Mailing List", "Third Party Advisory"], "refsource": "MLIST"}, {"url": "https://seclists.org/bugtraq/2019/Dec/8", "name": "20191205 Authentication vulnerabilities in OpenBSD", "tags": ["Exploit", "Mailing List", "Third Party Advisory"], "refsource": "BUGTRAQ"}, {"url": "http://packetstormsecurity.com/files/155572/Qualys-Security-Advisory-OpenBSD-Authentication-Bypass-Privilege-Escalation.html", "name": "http://packetstormsecurity.com/files/155572/Qualys-Security-Advisory-OpenBSD-Authentication-Bypass-Privilege-Escalation.html", "tags": ["Third Party Advisory"], "refsource": "MISC"}, {"url": "http://seclists.org/fulldisclosure/2019/Dec/14", "name": "20191206 Authentication vulnerabilities in OpenBSD", "tags": ["Third Party Advisory"], "refsource": "FULLDISC"}]}, "data_format": "MITRE", "description": {"description_data": [{"lang": "en", "value": "libc in OpenBSD 6.6 allows authentication bypass via the -schallenge username, as demonstrated by smtpd, ldapd, or radiusd. This is related to gen/auth_subr.c and gen/authenticate.c in libc (and login/login.c and xenocara/app/xenodm/greeter/verify.c)."}]}, "problemtype": {"problemtype_data": [{"description": [{"lang": "en", "value": "CWE-287"}]}]}, "data_version": "4.0", "CVE_data_meta": {"ID": "CVE-2019-19521", "ASSIGNER": "cve@mitre.org"}}, "impact": {"baseMetricV2": {"cvssV2": {"version": "2.0", "baseScore": 7.5, "accessVector": "NETWORK", "vectorString": "AV:N/AC:L/Au:N/C:P/I:P/A:P", "authentication": "NONE", "integrityImpact": "PARTIAL", "accessComplexity": "LOW", "availabilityImpact": "PARTIAL", "confidentialityImpact": "PARTIAL"}, "severity": "HIGH", "acInsufInfo": false, "impactScore": 6.4, "obtainAllPrivilege": false, "exploitabilityScore": 10.0, "obtainUserPrivilege": false, "obtainOtherPrivilege": false, "userInteractionRequired": false}, "baseMetricV3": {"cvssV3": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 9.8, "attackVector": "NETWORK", "baseSeverity": "CRITICAL", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}, "impactScore": 5.9, "exploitabilityScore": 3.9}}, "publishedDate": "2019-12-05T00:15Z", "configurations": {"nodes": [{"children": [], "operator": "OR", "cpe_match": [{"cpe23Uri": "cpe:2.3:o:openbsd:openbsd:6.6:*:*:*:*:*:*:*", "cpe_name": [], "vulnerable": true}]}], "CVE_data_version": "4.0"}, "lastModifiedDate": "2019-12-12T15:55Z"}