Denial of service in LibVNCServer

1) NULL pointer dereference

EUVDB-ID: #VU29386

Risk: Medium

CVSSv4.0: 4.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2010-5304

CWE-ID: CWE-476 - NULL Pointer Dereference

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to a NULL pointer dereference error in the way LibVNCServer handles certain ClientCutText messages. A remote attacker could use this flaw to crash the VNC server by sending a specially crafted ClientCutText message from a VNC client.

Mitigation

Install update from vendor's website.

Vulnerable software versions

LibVNCServer: 0.9.0 - 0.9.8.2

CPE2.3

• cpe:2.3:a:libvnc:libvncserver:0.9.0:*:*:*:*:*:*:*
• cpe:2.3:a:libvnc:libvncserver:0.9.1:*:*:*:*:*:*:*
• cpe:2.3:a:libvnc:libvncserver:0.9.2:*:*:*:*:*:*:*

External links

https://lists.fedoraproject.org/pipermail/package-announce/2014-October/139654.html
https://lists.fedoraproject.org/pipermail/package-announce/2014-October/139814.html
https://lists.fedoraproject.org/pipermail/package-announce/2014-October/140219.html
https://lists.fedoraproject.org/pipermail/package-announce/2014-September/139445.html
https://seclists.org/oss-sec/2014/q3/639
https://www.openwall.com/lists/oss-security/2014/09/23/6

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected application in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

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