#VU32874 Input validation error in WebKitGTK+ and WPE WebKit - CVE-2020-13753

Vulnerability identifier: #VU32874

Vulnerability risk: High

CVSSv4.0: 6.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2020-13753

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: No

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

Vendor: WebKitGTK

Description

The vulnerability allows a remote non-authenticated attacker to execute arbitrary code.

The bubblewrap sandbox of WebKitGTK and WPE WebKit, prior to 2.28.3, failed to properly block access to CLONE_NEWUSER and the TIOCSTI ioctl. CLONE_NEWUSER could potentially be used to confuse xdg-desktop-portal, which allows access outside the sandbox. TIOCSTI can be used to directly execute commands outside the sandbox by writing to the controlling terminal's input buffer, similar to CVE-2017-5226.

Mitigation
Install update from vendor's website.

Vulnerable software versions

WebKitGTK+: 2.28.0 - 2.28.2

WPE WebKit: 2.28.0 - 2.28.2

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External links
https://lists.opensuse.org/opensuse-security-announce/2020-07/msg00074.html
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/GER2ATKZXDHM7FFYJH67ZPNZZX5VOUVM/
https://security.gentoo.org/glsa/202007-11
https://trac.webkit.org/changeset/262368/webkit
https://usn.ubuntu.com/4422-1/
https://www.debian.org/security/2020/dsa-4724
https://www.openwall.com/lists/oss-security/2020/07/10/1

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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.