Vulnerability CVE-2011-1775

Vulnerability Name:

CVE-2011-1775 (CCN-67311)

Assigned:

2011-05-04

Published:

2011-05-04

Updated:

2023-02-13

Summary:

The CSecurityTLS::processMsg function in common/rfb/CSecurityTLS.cxx in the vncviewer component in TigerVNC 1.1beta1 does not properly verify the server's X.509 certificate, which allows man-in-the-middle attackers to spoof a TLS VNC server via an arbitrary certificate.

CVSS v3 Severity:

5.3 Medium (CCN CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N)

Exploitability Metrics:	Attack Vector (AV): Network Attack Complexity (AC): Low Privileges Required (PR): None User Interaction (UI): None
Scope:	Scope (S): Unchanged
Impact Metrics:	Confidentiality (C): None Integrity (I): Low Availibility (A): None

CVSS v2 Severity:

5.8 Medium (CVSS v2 Vector: AV:N/AC:M/Au:N/C:P/I:P/A:N)
4.3 Medium (Temporal CVSS v2 Vector: AV:N/AC:M/Au:N/C:P/I:P/A:N/E:U/RL:OF/RC:C)

Exploitability Metrics:	Access Vector (AV): Network Access Complexity (AC): Medium Authentication (Au): None
Impact Metrics:	Confidentiality (C): Partial Integrity (I): Partial Availibility (A): None

4.3 Medium (CCN CVSS v2 Vector: AV:N/AC:M/Au:N/C:N/I:P/A:N)
3.2 Low (CCN Temporal CVSS v2 Vector: AV:N/AC:M/Au:N/C:N/I:P/A:N/E:U/RL:OF/RC:C)

Exploitability Metrics:	Access Vector (AV): Network Access Complexity (AC): Medium Athentication (Au): None
Impact Metrics:	Confidentiality (C): None Integrity (I): Partial Availibility (A): None

2.6 Low (REDHAT CVSS v2 Vector: AV:N/AC:H/Au:N/C:P/I:N/A:N)
1.9 Low (REDHAT Temporal CVSS v2 Vector: AV:N/AC:H/Au:N/C:P/I:N/A:N/E:U/RL:OF/RC:C)

Exploitability Metrics:	Access Vector (AV): Network Access Complexity (AC): High Authentication (Au): None
Impact Metrics:	Confidentiality (C): Partial Integrity (I): None Availibility (A): None

Vulnerability Consequences:

Bypass Security

References:

Source: MITRE
Type: CNA
CVE-2011-1775

Source: secalert@redhat.com
Type: UNKNOWN
secalert@redhat.com

Source: secalert@redhat.com
Type: UNKNOWN
secalert@redhat.com

Source: secalert@redhat.com
Type: UNKNOWN
secalert@redhat.com

Source: CCN
Type: RHSA-2011-0871
Moderate: tigervnc security update

Source: CCN
Type: TigerVNC Web site
TigerVNC

Source: secalert@redhat.com
Type: UNKNOWN
secalert@redhat.com

Source: secalert@redhat.com
Type: UNKNOWN
secalert@redhat.com

Source: secalert@redhat.com
Type: UNKNOWN
secalert@redhat.com

Source: CCN
Type: OSVDB ID: 73119
TigerVNC CSecurityTLS::processMsg Function common/rfb/CSecurityTLS.cxx X.509 Certificate MiTM Account Credentials Disclosure

Source: secalert@redhat.com
Type: UNKNOWN
secalert@redhat.com

Source: CCN
Type: BID-47738
TigerVNC SSL Certificate Validation Security Bypass Vulnerability

Source: secalert@redhat.com
Type: UNKNOWN
secalert@redhat.com

Source: CCN
Type: Red Hat Bugzilla Bug 702470
tigervnc: vncviewer can send password to server without proper validation of the X.509 certificate

Source: secalert@redhat.com
Type: UNKNOWN
secalert@redhat.com

Source: secalert@redhat.com
Type: UNKNOWN
secalert@redhat.com

Source: XF
Type: UNKNOWN
tigervnc-ssl-security-bypass(67311)

Vulnerable Configuration:

Configuration RedHat 1:

cpe:/o:redhat:enterprise_linux:6:*:*:*:*:*:*:*

Configuration RedHat 2:

cpe:/o:redhat:enterprise_linux:6::server:*:*:*:*:*

Configuration CCN 1:

cpe:/a:tigervnc:tigervnc:1.1.0:*:*:*:*:*:*:*

AND

cpe:/o:redhat:enterprise_linux:6:*:server:*:*:*:*:*

OR cpe:/o:redhat:enterprise_linux:6:*:workstation:*:*:*:*:*

OR cpe:/o:redhat:enterprise_linux_desktop:6:*:*:*:*:*:*:*

OR cpe:/o:redhat:enterprise_linux_hpc_node:6:*:*:*:*:*:*:*

OR cpe:/o:redhat:enterprise_linux_server_eus:6.1.z:*:*:*:*:*:*:*

Denotes that component is vulnerable

Oval Definitions

Definition ID	Class	Title	Last Modified
oval:org.mitre.oval:def:23428	P	ELSA-2011:0871: tigervnc security update (Moderate)	2014-05-26
oval:org.mitre.oval:def:21963	P	RHSA-2011:0871: tigervnc security update (Moderate)	2014-02-24
oval:com.redhat.rhsa:def:20110871	P	RHSA-2011:0871: tigervnc security update (Moderate)	2011-06-15

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