CVE-2019-8266

UltraVNC revision 1207 has multiple out-of-bounds access vulnerabilities connected with improper usage of ClientConnection::Copybuffer function in VNC client code, which can potentially result in code execution. This attack appears to be exploitable via network connectivity. User interaction is required to trigger these vulnerabilities. These vulnerabilities have been fixed in revision 1208.

CVSS v3 9.8 CRITICAL
CVSS v2.0 7.5 HIGH

9.8^/10

CVSS v3 : CRITICAL

Vector : AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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://cert-portal.siemens.com/productcert/pdf/ssa-927095.pdf
https://ics-cert.kaspersky.com/advisories/klcert-advisories/2019/03/01/klcert-19-013-ultravnc-access-of-memory-location-after-end-of-buffer/	Third Party Advisory
https://www.us-cert.gov/ics/advisories/icsa-20-161-06

Configurations

Configuration 1 (hide)

cpe:2.3:a:uvnc:ultravnc:*:*:*:*:*:*:*:*

History

No history.

Information

Published : 2019-03-08 23:29

Updated : 2023-12-10 12:59

NVD link : CVE-2019-8266

Mitre link : CVE-2019-8266

CVE.ORG link : CVE-2019-8266

JSON object : View

Products Affected

uvnc

ultravnc

CWE

CWE-125

Out-of-bounds Read

CWE-787

Out-of-bounds Write

CWE-788

Access of Memory Location After End of Buffer

{"id": "CVE-2019-8266", "metrics": {"cvssMetricV2": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"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"}, "acInsufInfo": false, "impactScore": 6.4, "baseSeverity": "HIGH", "obtainAllPrivilege": false, "exploitabilityScore": 10.0, "obtainUserPrivilege": false, "obtainOtherPrivilege": false, "userInteractionRequired": false}], "cvssMetricV30": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "UNCHANGED", "version": "3.0", "baseScore": 9.8, "attackVector": "NETWORK", "baseSeverity": "CRITICAL", "vectorString": "CVSS:3.0/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}]}, "published": "2019-03-08T23:29:00.547", "references": [{"url": "https://cert-portal.siemens.com/productcert/pdf/ssa-927095.pdf", "source": "vulnerability@kaspersky.com"}, {"url": "https://ics-cert.kaspersky.com/advisories/klcert-advisories/2019/03/01/klcert-19-013-ultravnc-access-of-memory-location-after-end-of-buffer/", "tags": ["Third Party Advisory"], "source": "vulnerability@kaspersky.com"}, {"url": "https://www.us-cert.gov/ics/advisories/icsa-20-161-06", "source": "vulnerability@kaspersky.com"}], "vulnStatus": "Modified", "weaknesses": [{"type": "Primary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "CWE-125"}, {"lang": "en", "value": "CWE-787"}]}, {"type": "Secondary", "source": "vulnerability@kaspersky.com", "description": [{"lang": "en", "value": "CWE-788"}]}], "descriptions": [{"lang": "en", "value": "UltraVNC revision 1207 has multiple out-of-bounds access vulnerabilities connected with improper usage of ClientConnection::Copybuffer function in VNC client code, which can potentially result in code execution. This attack appears to be exploitable via network connectivity. User interaction is required to trigger these vulnerabilities. These vulnerabilities have been fixed in revision 1208."}, {"lang": "es", "value": "UltraVNC, en su revisi\u00f3n 1207, tiene m\u00faltiples vulnerabilidades de acceso fuera de l\u00edmites conectadas al uso incorrecto de la funci\u00f3n ClientConnection::Copybuffer en el c\u00f3digo VNC del cliente, lo que podr\u00eda resultar en una ejecuci\u00f3n de c\u00f3digo. Este ataque parece ser explotable mediante la conectividad de red. Se requiere la interacci\u00f3n del usuario para desencadenar estas vulnerabilidades. Se han solucionado estas vulnerabilidades en la revisi\u00f3n 1208."}], "lastModified": "2020-06-12T21:15:10.193", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:uvnc:ultravnc:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "555D034F-3D64-4ED1-9B63-F8D59199E99C", "versionEndExcluding": "1.2.2.3"}], "operator": "OR"}]}], "sourceIdentifier": "vulnerability@kaspersky.com"}