#VU18301 Buffer overflow in WebKitGTK+ - CVE-2019-8375

Vulnerability identifier: #VU18301

Vulnerability risk: High

CVSSv4.0: 8.9 [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:P/U:Amber]

CVE-ID: CVE-2019-8375

CWE-ID: CWE-119

Exploitation vector: Network

Exploit availability: Yes

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

Vendor: WebKitGTK

Description

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

The vulnerability exists due to a boundary error within the UIProcess subsystem when processing an overly large script dialog size that exceeds the web view size. A remote attacker can send a specially crafted request to the affected application, trigger memory corruption and execute arbitrary code on the target system.

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

Mitigation
Install updates from vendor's website.

Vulnerable software versions

WebKitGTK+: 2.22.0 - 2.23.90

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External links
https://lists.opensuse.org/opensuse-security-announce/2019-04/msg00058.html
https://bugs.webkit.org/show_bug.cgi?id=184875
https://github.com/WebKit/webkit/commit/6f9b511a115311b13c06eb58038ddc2c78da5531
https://trac.webkit.org/changeset/241515/webkit
https://usn.ubuntu.com/3948-1/
https://www.exploit-db.com/exploits/46465/
https://www.inputzero.io/2019/02/fuzzing-webkit.html

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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. However, proof of concept for this vulnerability is available.