CVE-2019-17498

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{}

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A crafted SSH server may be able to disclose sensitive information or cause a denial of service condition on the client system when a user connects to the server."}, {"lang": "es", "value": "En libssh2 versi\u00f3n v1.9.0 y anteriores, la l\u00f3gica de la funci\u00f3n SSH_MSG_DISCONNECT en el archivo packet.c presenta un desbordamiento de enteros en una comprobaci\u00f3n de l\u00edmites, lo que permite a un atacante especificar un desplazamiento arbitrario (fuera de l\u00edmites) para una lectura de memoria posterior. Un servidor SSH dise\u00f1ado puede ser capaz de revelar informaci\u00f3n confidencial o causar una condici\u00f3n de denegaci\u00f3n de servicio en el sistema del cliente cuando un usuario conecta con el servidor."}], "id": "CVE-2019-17498", "lastModified": "2026-10-14T07:16:48.780", "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": true}], "cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.1, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 5.2, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2019-10-21T22:15:10.523", "references": [{"source": "cve@mitre.org", "tags": ["Mailing List", "Third Party Advisory"], "url": "http://lists.opensuse.org/opensuse-security-announce/2019-11/msg00026.html"}, {"source": "cve@mitre.org", "url": "http://packetstormsecurity.com/files/172835/libssh2-1.9.0-Out-Of-Bounds-Read.html"}, {"source": "cve@mitre.org", "tags": ["Broken Link"], "url": "https://blog.semmle.com/libssh2-integer-overflow-CVE-2019-17498/"}, {"source": "cve@mitre.org", "tags": ["Exploit", "Third Party Advisory"], "url": 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{"affected_release": [{"advisory": "RHSA-2020:3915", "cpe": "cpe:/o:redhat:enterprise_linux:7", "package": "libssh2-0:1.8.0-4.el7", "product_name": "Red Hat Enterprise Linux 7", "release_date": "2020-09-29T00:00:00Z"}, {"advisory": "RHSA-2021:0949", "cpe": "cpe:/a:redhat:openshift_do:1.0::el7", "package": "openshiftdo/odo-init-image-rhel7:1.1.3-2", "product_name": "Red Hat OpenShift Do", "release_date": "2021-03-22T00:00:00Z"}], "bugzilla": {"description": "libssh2: integer overflow in SSH_MSG_DISCONNECT logic in packet.c", "id": "1766898", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1766898"}, "csaw": false, "cvss3": {"cvss3_base_score": "6.5", "cvss3_scoring_vector": "CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N", "status": "verified"}, "cwe": "(CWE-190|CWE-200|CWE-400)", "details": ["In libssh2 v1.9.0 and earlier versions, the SSH_MSG_DISCONNECT logic in packet.c has an integer overflow in a bounds check, enabling an attacker to specify an arbitrary (out-of-bounds) offset for a subsequent memory read. A crafted SSH server may be able to disclose sensitive information or cause a denial of service condition on the client system when a user connects to the server."], "name": "CVE-2019-17498", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "libssh2", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "virt:rhel/libssh2", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/a:redhat:advanced_virtualization:8::el8", "fix_state": "Will not fix", "package_name": "virt:8.0/libssh2", "product_name": "Red Hat Enterprise Linux 8 Advanced Virtualization"}], "public_date": "2019-10-16T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2019-17498\nhttps://nvd.nist.gov/vuln/detail/CVE-2019-17498\nhttps://blog.semmle.com/libssh2-integer-overflow-CVE-2019-17498/"], "statement": "This flaw needs a malicious MITM SSH server. When an application compiled with libssh2 connects to such a MITM SSH server, the server can trigger an integer overflow leading to an OOB read in the SSH_MSG_DISCONNECT logic. This can cause the application compiled with libssh2 to crash. This is strictly a client side crash and the SSH server may not be affected.\nAlso note that when a user connects to a malicious MITM server there is already a risk of disclosing password/keys irrespective of the flaw.", "threat_severity": "Moderate"}

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