Input validation error in TigerVNC

1) Input validation error

EUVDB-ID: #VU45014

Risk: Medium

CVSSv4.0: 2.7 [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/E:U/U:Green]

CVE-ID: CVE-2011-1775

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

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.

Mitigation

Install update from vendor's website.

Vulnerable software versions

TigerVNC: 1.1

CPE2.3

• cpe:2.3:a:tigervnc.org:tigervnc:1.1:*:*:*:*:*:*:*

External links

https://lists.fedoraproject.org/pipermail/package-announce/2011-May/060567.html
https://openwall.com/lists/oss-security/2011/05/06/2
https://openwall.com/lists/oss-security/2011/05/09/7
https://secunia.com/advisories/44939
https://www.mail-archive.com/tigervnc-devel@lists.sourceforge.net/msg01342.html
https://www.mail-archive.com/tigervnc-devel@lists.sourceforge.net/msg01345.html
https://www.mail-archive.com/tigervnc-devel@lists.sourceforge.net/msg01347.html
https://www.redhat.com/support/errata/RHSA-2011-0871.html
https://www.securityfocus.com/bid/47738
https://bugzilla.redhat.com/show_bug.cgi?id=702470
https://bugzilla.redhat.com/show_bug.cgi?id=702672

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.