CVE-2020-26117

In rfb/CSecurityTLS.cxx and rfb/CSecurityTLS.java in TigerVNC before 1.11.0, viewers mishandle TLS certificate exceptions. They store the certificates as authorities, meaning that the owner of a certificate could impersonate any server after a client had added an exception.

CVSS v3.0 8.1 HIGH
CVSS v2.0 5.8 MEDIUM

8.1^/10

CVSS v3.0 : HIGH

Vector :

Exploitability : 2.8 / Impact : 5.2

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction REQUIRED

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact NONE

Scope UNCHANGED

5.8^/10

CVSS v2.0 : MEDIUM

Vector : AV:N/AC:M/Au:N/C:P/I:P/A:N

Exploitability : 8.6 / Impact : 4.9

Access Vector NETWORK

Access Complexity MEDIUM

Authentication NONE

Confidentiality Impact PARTIAL

Integrity Impact PARTIAL

Availability Impact NONE

References

Link	Resource
https://github.com/TigerVNC/tigervnc/commit/20dea801e747318525a5859fe4f37c52b05310cb	Patch Third Party Advisory
https://github.com/TigerVNC/tigervnc/commit/b30f10c681ec87720cff85d490f67098568a9cba	Patch Third Party Advisory
https://github.com/TigerVNC/tigervnc/releases/tag/v1.11.0	Release Notes Third Party Advisory
https://github.com/TigerVNC/tigervnc/commit/f029745f63ac7d22fb91639b2cb5b3ab56134d6e	Patch Third Party Advisory
https://bugzilla.opensuse.org/show_bug.cgi?id=1176733	Issue Tracking Third Party Advisory
https://github.com/TigerVNC/tigervnc/commit/7399eab79a4365434d26494fa1628ce1eb91562b	Patch Third Party Advisory
https://lists.debian.org/debian-lts-announce/2020/10/msg00007.html	Mailing List Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00025.html	Broken Link Mailing List Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-11/msg00024.html	Broken Link Mailing List Third Party Advisory

Advertisement

Configurations

Configuration 1 (hide)

cpe:2.3:a:tigervnc:tigervnc:*:*:*:*:*:*:*:*

Configuration 2 (hide)

OR	cpe:2.3:o:debian:debian_linux:9.0:::::::*
	cpe:2.3:o:opensuse:leap:15.2:::::::*

Information

Published : 2020-09-26 21:15

Updated : 2022-11-16 06:13

NVD link : CVE-2020-26117

Mitre link : CVE-2020-26117

JSON object : View

CWE

CWE-295

Improper Certificate Validation

Advertisement

Products Affected

debian

debian_linux

tigervnc

tigervnc

opensuse

leap

{"cve": {"data_type": "CVE", "references": {"reference_data": [{"url": "https://github.com/TigerVNC/tigervnc/commit/20dea801e747318525a5859fe4f37c52b05310cb", "name": "https://github.com/TigerVNC/tigervnc/commit/20dea801e747318525a5859fe4f37c52b05310cb", "tags": ["Patch", "Third Party Advisory"], "refsource": "MISC"}, {"url": "https://github.com/TigerVNC/tigervnc/commit/b30f10c681ec87720cff85d490f67098568a9cba", "name": "https://github.com/TigerVNC/tigervnc/commit/b30f10c681ec87720cff85d490f67098568a9cba", "tags": ["Patch", "Third Party Advisory"], "refsource": "MISC"}, {"url": "https://github.com/TigerVNC/tigervnc/releases/tag/v1.11.0", "name": "https://github.com/TigerVNC/tigervnc/releases/tag/v1.11.0", "tags": ["Release Notes", "Third Party Advisory"], "refsource": "MISC"}, {"url": "https://github.com/TigerVNC/tigervnc/commit/f029745f63ac7d22fb91639b2cb5b3ab56134d6e", "name": "https://github.com/TigerVNC/tigervnc/commit/f029745f63ac7d22fb91639b2cb5b3ab56134d6e", "tags": ["Patch", "Third Party Advisory"], "refsource": "MISC"}, {"url": "https://bugzilla.opensuse.org/show_bug.cgi?id=1176733", "name": "https://bugzilla.opensuse.org/show_bug.cgi?id=1176733", "tags": ["Issue Tracking", "Third Party Advisory"], "refsource": "MISC"}, {"url": "https://github.com/TigerVNC/tigervnc/commit/7399eab79a4365434d26494fa1628ce1eb91562b", "name": "https://github.com/TigerVNC/tigervnc/commit/7399eab79a4365434d26494fa1628ce1eb91562b", "tags": ["Patch", "Third Party Advisory"], "refsource": "MISC"}, {"url": "https://lists.debian.org/debian-lts-announce/2020/10/msg00007.html", "name": "[debian-lts-announce] 20201006 [SECURITY] [DLA 2396-1] tigervnc security update", "tags": ["Mailing List", "Third Party Advisory"], "refsource": "MLIST"}, {"url": "http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00025.html", "name": "openSUSE-SU-2020:1666", "tags": ["Broken Link", "Mailing List", "Third Party Advisory"], "refsource": "SUSE"}, {"url": "http://lists.opensuse.org/opensuse-security-announce/2020-11/msg00024.html", "name": "openSUSE-SU-2020:1841", "tags": ["Broken Link", "Mailing List", "Third Party Advisory"], "refsource": "SUSE"}]}, "data_format": "MITRE", "description": {"description_data": [{"lang": "en", "value": "In rfb/CSecurityTLS.cxx and rfb/CSecurityTLS.java in TigerVNC before 1.11.0, viewers mishandle TLS certificate exceptions. They store the certificates as authorities, meaning that the owner of a certificate could impersonate any server after a client had added an exception."}]}, "problemtype": {"problemtype_data": [{"description": [{"lang": "en", "value": "CWE-295"}]}]}, "data_version": "4.0", "CVE_data_meta": {"ID": "CVE-2020-26117", "ASSIGNER": "cve@mitre.org"}}, "impact": {"baseMetricV2": {"cvssV2": {"version": "2.0", "baseScore": 5.8, "accessVector": "NETWORK", "vectorString": "AV:N/AC:M/Au:N/C:P/I:P/A:N", "authentication": "NONE", "integrityImpact": "PARTIAL", "accessComplexity": "MEDIUM", "availabilityImpact": "NONE", "confidentialityImpact": "PARTIAL"}, "severity": "MEDIUM", "acInsufInfo": false, "impactScore": 4.9, "obtainAllPrivilege": false, "exploitabilityScore": 8.6, "obtainUserPrivilege": false, "obtainOtherPrivilege": false, "userInteractionRequired": true}, "baseMetricV3": {"cvssV3": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 8.1, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N", "integrityImpact": "HIGH", "userInteraction": "REQUIRED", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}, "impactScore": 5.2, "exploitabilityScore": 2.8}}, "publishedDate": "2020-09-27T04:15Z", "configurations": {"nodes": [{"children": [], "operator": "OR", "cpe_match": [{"cpe23Uri": "cpe:2.3:a:tigervnc:tigervnc:*:*:*:*:*:*:*:*", "cpe_name": [], "vulnerable": true, "versionEndExcluding": "1.11.0"}]}, {"children": [], "operator": "OR", "cpe_match": [{"cpe23Uri": "cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*", "cpe_name": [], "vulnerable": true}, {"cpe23Uri": "cpe:2.3:o:opensuse:leap:15.2:*:*:*:*:*:*:*", "cpe_name": [], "vulnerable": true}]}], "CVE_data_version": "4.0"}, "lastModifiedDate": "2022-11-16T14:13Z"}