CVE-2016-0787

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\"bits/bytes confusion bug\"."}], "id": "CVE-2016-0787", "lastModified": "2026-06-17T00:38:13.797", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "MEDIUM", "cvssData": {"accessComplexity": "MEDIUM", "accessVector": "NETWORK", "authentication": "NONE", "availabilityImpact": "NONE", "baseScore": 4.3, "confidentialityImpact": "PARTIAL", "integrityImpact": "NONE", "vectorString": "AV:N/AC:M/Au:N/C:P/I:N/A:N", "version": "2.0"}, "exploitabilityScore": 8.6, "impactScore": 2.9, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "source": "nvd@nist.gov", "type": "Primary", "userInteractionRequired": false}], "cvssMetricV30": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 5.9, "baseSeverity": "MEDIUM", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N", "version": "3.0"}, "exploitabilityScore": 2.2, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2016-04-13T17:59:10.930", "references": [{"source": "secalert@redhat.com", "url": "http://lists.fedoraproject.org/pipermail/package-announce/2016-February/177980.html"}, {"source": "secalert@redhat.com", "url": "http://lists.fedoraproject.org/pipermail/package-announce/2016-March/178573.html"}, {"source": "secalert@redhat.com", "url": "http://lists.opensuse.org/opensuse-updates/2016-03/msg00008.html"}, {"source": "secalert@redhat.com", "url": "http://www.debian.org/security/2016/dsa-3487"}, {"source": "secalert@redhat.com", "url": "http://www.oracle.com/technetwork/topics/security/linuxbulletinjan2016-2867209.html"}, {"source": "secalert@redhat.com", "url": "http://www.securityfocus.com/bid/82514"}, {"source": "secalert@redhat.com", "url": "https://bto.bluecoat.com/security-advisory/sa120"}, {"source": 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{"acknowledgement": "Red Hat would like to thank Aris Adamantiadis for reporting this issue.", "affected_release": [{"advisory": "RHSA-2016:0428", "cpe": "cpe:/o:redhat:enterprise_linux:6", "package": "libssh2-0:1.4.2-2.el6_7.1", "product_name": "Red Hat Enterprise Linux 6", "release_date": "2016-03-10T00:00:00Z"}, {"advisory": "RHSA-2016:0428", "cpe": "cpe:/o:redhat:enterprise_linux:7", "package": "libssh2-0:1.4.3-10.el7_2.1", "product_name": "Red Hat Enterprise Linux 7", "release_date": "2016-03-10T00:00:00Z"}], "bugzilla": {"description": "libssh2: bits/bytes confusion resulting in truncated Diffie-Hellman secret length", "id": "1306021", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1306021"}, "csaw": false, "cvss": {"cvss_base_score": "5.8", "cvss_scoring_vector": "AV:N/AC:M/Au:N/C:P/I:P/A:N", "status": "verified"}, "cwe": "CWE-704", "details": ["The diffie_hellman_sha256 function in kex.c in libssh2 before 1.7.0 improperly truncates secrets to 128 or 256 bits, which makes it easier for man-in-the-middle attackers to decrypt or intercept SSH sessions via unspecified vectors, aka a \"bits/bytes confusion bug.\"", "A type confusion issue was found in the way libssh2 generated ephemeral secrets for the diffie-hellman-group1 and diffie-hellman-group14 key exchange methods. This would cause an SSHv2 Diffie-Hellman handshake to use significantly less secure random parameters."], "name": "CVE-2016-0787", "public_date": "2016-02-23T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2016-0787\nhttps://nvd.nist.gov/vuln/detail/CVE-2016-0787\nhttp://www.libssh2.org/adv_20160223.html"], "threat_severity": "Moderate"}

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