Input validation error in TigerVNC - CVE-2011-1775
Published: May 26, 2011 / Updated: August 11, 2020
Vulnerability identifier: #VU45014
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2011-1775
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote non-authenticated attacker to read and manipulate data.
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.
Affected software
TigerVNC
How to mitigate CVE-2011-1775
Install update from vendor's website.
External References
- http://lists.fedoraproject.org/pipermail/package-announce/2011-May/060567.html
- http://openwall.com/lists/oss-security/2011/05/06/2
- http://openwall.com/lists/oss-security/2011/05/09/7
- http://secunia.com/advisories/44939
- http://www.mail-archive.com/tigervnc-devel@lists.sourceforge.net/msg01342.html
- http://www.mail-archive.com/tigervnc-devel@lists.sourceforge.net/msg01345.html
- http://www.mail-archive.com/tigervnc-devel@lists.sourceforge.net/msg01347.html
- http://www.redhat.com/support/errata/RHSA-2011-0871.html
- http://www.securityfocus.com/bid/47738
- https://bugzilla.redhat.com/show_bug.cgi?id=702470
- https://bugzilla.redhat.com/show_bug.cgi?id=702672