#VU15546 Out-of-bounds write in WebKitGTK+ - CVE-2018-12911

Vulnerability identifier: #VU15546

Vulnerability risk: High

CVSSv4.0: 8.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2018-12911

CWE-ID: CWE-787

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
WebKitGTK+
Server applications / Frameworks for developing and running applications

Vendor: WebKitGTK

Description
The vulnerability allows a remote attacker to execute arbitrary code with elevated privileges.

The weakness exists due to an off-by-one error in the get_simple_globs functions in ThirdParty/xdgmime/src/xdgmimecache.c and ThirdParty/xdgmime/src/xdgmimeglob.c. A remote attacker can trigger out-of-bounds write and execute arbitrary code with elevated privileges.

Successful exploitation of the vulnerability may result in system compromise.

Mitigation
Install update from vendor's website.

Vulnerable software versions

WebKitGTK+: 2.20.3

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External links
https://trac.webkit.org/changeset/233404/webkit

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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.