Input validation error in gnome-shell

1) Input validation error

EUVDB-ID: #VU39101

Risk: High

CVSSv4.0: 7.2 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2017-8288

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

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

gnome-shell 3.22 through 3.24.1 mishandles extensions that fail to reload, which can lead to leaving extensions enabled in the lock screen. With these extensions, a bystander could launch applications (but not interact with them), see information from the extensions (e.g., what applications you have opened or what music you were playing), or even execute arbitrary commands. It all depends on what extensions a user has enabled. The problem is caused by lack of exception handling in js/ui/extensionSystem.js.

Mitigation

Install update from vendor's website.

Vulnerable software versions

gnome-shell: 3.22.0 - 3.24.1

CPE2.3

• cpe:2.3:a:gnome:gnome-shell:3.24.1:*:*:*:*:*:*:*

External links

https://www.securityfocus.com/bid/98070
https://bugs.kali.org/view.php?id=2513
https://bugzilla.gnome.org/show_bug.cgi?id=781728
https://github.com/EasyScreenCast/EasyScreenCast/issues/46
https://github.com/GNOME/gnome-shell/commit/ff425d1db7082e2755d2a405af53861552acf2a1

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.