#VU29386 NULL pointer dereference in LibVNCServer - CVE-2010-5304

Vulnerability identifier: #VU29386

Vulnerability 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

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
LibVNCServer
Server applications / Remote management servers, RDP, SSH

Vendor: LibVNC

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

---

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.

Is there known malware, which exploits this vulnerability?

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