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cuando no es posible acceder directamente a las contrase\u00f1as, permite a usuarios locales enumerar los nombres de usuario o causar una denegaci\u00f3n de servicio (colgado) a trav\u00e9s de una contrase\u00f1a larga."}], "id": "CVE-2015-3238", "lastModified": "2025-04-12T10:46:40.837", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "MEDIUM", "cvssData": {"accessComplexity": "MEDIUM", "accessVector": "NETWORK", "authentication": "NONE", "availabilityImpact": "PARTIAL", "baseScore": 5.8, "confidentialityImpact": "PARTIAL", "integrityImpact": "NONE", "vectorString": "AV:N/AC:M/Au:N/C:P/I:N/A:P", "version": "2.0"}, "exploitabilityScore": 8.6, "impactScore": 4.9, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "source": "nvd@nist.gov", "type": "Primary", "userInteractionRequired": false}], "cvssMetricV30": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "LOW", "baseScore": 6.5, 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{"source": "secalert@redhat.com", "url": "http://www.securityfocus.com/bid/75428"}, {"source": "secalert@redhat.com", "url": "http://www.ubuntu.com/usn/USN-2935-1"}, {"source": "secalert@redhat.com", "url": "http://www.ubuntu.com/usn/USN-2935-2"}, {"source": "secalert@redhat.com", "url": "http://www.ubuntu.com/usn/USN-2935-3"}, {"source": "secalert@redhat.com", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1228571"}, {"source": "secalert@redhat.com", "url": "https://security.gentoo.org/glsa/201605-05"}, {"source": "secalert@redhat.com", "tags": ["Exploit"], "url": "https://www.trustwave.com/Resources/Security-Advisories/Advisories/TWSL2015-011/?fid=6551"}, {"source": "secalert@redhat.com", "tags": ["Exploit"], "url": "https://www.trustwave.com/Resources/SpiderLabs-Blog/Username-Enumeration-against-OpenSSH-SELinux-with-CVE-2015-3238/"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "http://lists.fedoraproject.org/pipermail/package-announce/2015-July/161350.html"}, 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{"acknowledgement": "Red Hat would like to thank Sebastien Macke (Trustwave SpiderLabs) for reporting this issue.", "affected_release": [{"advisory": "RHSA-2015:1640", "cpe": "cpe:/o:redhat:enterprise_linux:6", "package": "pam-0:1.1.1-20.el6_7.1", "product_name": "Red Hat Enterprise Linux 6", "release_date": "2015-08-18T00:00:00Z"}, {"advisory": "RHSA-2015:1640", "cpe": "cpe:/o:redhat:enterprise_linux:7", "package": "pam-0:1.1.8-12.el7_1.1", "product_name": "Red Hat Enterprise Linux 7", "release_date": "2015-08-18T00:00:00Z"}], "bugzilla": {"description": "pam: DoS/user enumeration due to blocking pipe in pam_unix module", "id": "1228571", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1228571"}, "csaw": false, "cvss": {"cvss_base_score": "6.4", "cvss_scoring_vector": "AV:N/AC:L/Au:N/C:P/I:N/A:P", "status": "verified"}, "cwe": "CWE-833->CWE-203", "details": ["The _unix_run_helper_binary function in the pam_unix module in Linux-PAM (aka pam) before 1.2.1, when unable to directly access passwords, allows local users to enumerate usernames or cause a denial of service (hang) via a large password.", "It was discovered that the _unix_run_helper_binary() function of PAM's unix_pam module could write to a blocking pipe, possibly causing the function to become unresponsive. An attacker able to supply large passwords to the unix_pam module could use this flaw to enumerate valid user accounts, or cause a denial of service on the system."], "name": "CVE-2015-3238", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:5", "fix_state": "Will not fix", "package_name": "pam", "product_name": "Red Hat Enterprise Linux 5"}], "public_date": "2015-06-25T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2015-3238\nhttps://nvd.nist.gov/vuln/detail/CVE-2015-3238"], "threat_severity": "Moderate"}