CVE-2018-20764

A buffer overflow exists in HelpSystems tcpcrypt on Linux, used for BoKS encrypted telnet through BoKS version 6.7.1. Since tcpcrypt is setuid, exploitation leads to privilege escalation.

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://community.helpsystems.com/knowledge-base/fox-technologies/hotfix/515/	Vendor Advisory
https://community.helpsystems.com/knowledge-base/fox-technologies/hotfix/515/	Vendor Advisory

Configurations

Configuration 1 (hide)

AND

cpe:2.3:a:helpsystems:boks:*:*:*:*:*:*:*:*

cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*

History

21 Nov 2024, 04:02

Type	Values Removed	Values Added
References	~~() https://community.helpsystems.com/knowledge-base/fox-technologies/hotfix/515/ - Vendor Advisory~~	() https://community.helpsystems.com/knowledge-base/fox-technologies/hotfix/515/ - Vendor Advisory

Information

Published : 2019-02-08 17:29

Updated : 2024-11-21 04:02

NVD link : CVE-2018-20764

Mitre link : CVE-2018-20764

CVE.ORG link : CVE-2018-20764

JSON object : View

Products Affected

helpsystems

boks

linux

linux_kernel

CWE

NVD-CWE-noinfo

{"id": "CVE-2018-20764", "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": "2019-02-08T17:29:00.303", "references": [{"url": "https://community.helpsystems.com/knowledge-base/fox-technologies/hotfix/515/", "tags": ["Vendor Advisory"], "source": "cve@mitre.org"}, {"url": "https://community.helpsystems.com/knowledge-base/fox-technologies/hotfix/515/", "tags": ["Vendor Advisory"], "source": "af854a3a-2127-422b-91ae-364da2661108"}], "vulnStatus": "Modified", "weaknesses": [{"type": "Primary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "NVD-CWE-noinfo"}]}], "descriptions": [{"lang": "en", "value": "A buffer overflow exists in HelpSystems tcpcrypt on Linux, used for BoKS encrypted telnet through BoKS version 6.7.1. Since tcpcrypt is setuid, exploitation leads to privilege escalation."}, {"lang": "es", "value": "Existe un desbordamiento de b\u00fafer en el tcpcrypt HelpSystems en Linux, empleado para el telnet cifrado de BoKS, hasta la versi\u00f3n 6.7.1 de BoKS. Como tcpcrypt es setuid, su explotaci\u00f3n conduce al escalado de privilegios."}], "lastModified": "2024-11-21T04:02:07.300", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:helpsystems:boks:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "31C953A8-5743-4F62-8622-06D10879B384", "versionEndIncluding": "6.7.1", "versionStartIncluding": "6.6.0"}], "operator": "OR"}, {"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*", "vulnerable": false, "matchCriteriaId": "703AF700-7A70-47E2-BC3A-7FD03B3CA9C1"}], "operator": "OR"}], "operator": "AND"}], "sourceIdentifier": "cve@mitre.org"}