CVE-2011-0539

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{"affected": [{"affectedData": [{"product": "n/a", "vendor": "n/a", "versions": [{"status": "affected", "version": "n/a"}]}], "source": "secalert@redhat.com"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:openbsd:openssh:5.6:*:*:*:*:*:*:*", "matchCriteriaId": "0C5D4A9B-1194-4D63-AAC2-8701C890BB0D", "vulnerable": true}, {"criteria": "cpe:2.3:a:openbsd:openssh:5.7:*:*:*:*:*:*:*", "matchCriteriaId": "F75DB5AE-E99D-4827-B290-823E015AEE34", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "The key_certify function in usr.bin/ssh/key.c in OpenSSH 5.6 and 5.7, when generating legacy certificates using the -t command-line option in ssh-keygen, does not initialize the nonce field, which might allow remote attackers to obtain sensitive stack memory contents or make it easier to conduct hash collision attacks."}, {"lang": "es", "value": "La funci\u00f3n key_certify en usr.bin/ssh/key.c en OpenSSH v5.6 y v5.7 al generar los certificados de herencia con la opci\u00f3n de l\u00ednea de comandos -t en ssh-keygen, no se inicializa el campo nonce, que podr\u00eda permitir a atacantes remotos obtener contenido sensible de la pila de memoria o que sea m\u00e1s f\u00e1cil de llevar a cabo ataques de colisi\u00f3n hash."}], "id": "CVE-2011-0539", "lastModified": "2026-06-16T23:27:35.500", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "MEDIUM", "cvssData": {"accessComplexity": "LOW", "accessVector": "NETWORK", "authentication": "NONE", "availabilityImpact": "NONE", "baseScore": 5.0, "confidentialityImpact": "PARTIAL", "integrityImpact": "NONE", "vectorString": "AV:N/AC:L/Au:N/C:P/I:N/A:N", "version": "2.0"}, "exploitabilityScore": 10.0, "impactScore": 2.9, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "source": "nvd@nist.gov", "type": "Primary", "userInteractionRequired": false}], "cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2011-0539", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-05-29T20:34:38.891519Z", "version": "2.0.3"}}]}, "published": "2011-02-10T18:00:57.660", "references": [{"source": "secalert@redhat.com", "url": "http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?objectID=c02794777"}, {"source": "secalert@redhat.com", "url": 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{"bugzilla": {"description": "OpenSSH: legacy certificate generation information leak", "id": "675254", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=675254"}, "csaw": false, "details": ["The key_certify function in usr.bin/ssh/key.c in OpenSSH 5.6 and 5.7, when generating legacy certificates using the -t command-line option in ssh-keygen, does not initialize the nonce field, which might allow remote attackers to obtain sensitive stack memory contents or make it easier to conduct hash collision attacks."], "name": "CVE-2011-0539", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:4", "fix_state": "Not affected", "package_name": "openssh", "product_name": "Red Hat Enterprise Linux 4"}, {"cpe": "cpe:/o:redhat:enterprise_linux:5", "fix_state": "Not affected", "package_name": "openssh", "product_name": "Red Hat Enterprise Linux 5"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "openssh", "product_name": "Red Hat Enterprise Linux 6"}], "public_date": "2011-02-04T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2011-0539\nhttps://nvd.nist.gov/vuln/detail/CVE-2011-0539"], "statement": "Not vulnerable. This issue did not affect the versions of openssh as shipped with Red Hat Enterprise Linux 4, 5, or 6.", "threat_severity": "Low"}

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