Vulnerability identifier: #VU9517

Vulnerability risk: High

CVSSv3.1: 8.3 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2017-16612

CWE-ID: CWE-190

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
libXcursor
Universal components / Libraries / Libraries used by multiple products

Vendor: X.org

Description

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to integer overflow when processing malicious cursors in libXcursor library. A remote attacker can use a specially crafted cursor to trigger heap-based buffer overflow and execute arbitrary code on the target system via the application, which uses the vulnerable library, such as GIMP.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Mitigation
Update to version 1.1.15.

Vulnerable software versions

libXcursor: 1.1.5.2 - 1.1.14

---

External links
http://cgit.freedesktop.org/xorg/lib/libXcursor/commit/?id=4794b5dd34688158fb51a2943032569d3780c4b8
http://www.openwall.com/lists/oss-security/2017/11/28/6

---

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.