Denial of service in Cairo

Published: 2019-01-21 | Updated: 2021-07-13

Risk	Low
Patch available	YES
Number of vulnerabilities	2
CVE-ID	CVE-2019-6462 CVE-2019-6461
CWE-ID	CWE-835 CWE-617
Exploitation vector	Network
Public exploit	Public exploit code for vulnerability #1 is available. Public exploit code for vulnerability #2 is available.
Vulnerable software Subscribe	Cairo Universal components / Libraries / Libraries used by multiple products
Vendor	cairographics

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) Infinite loop

EUVDB-ID: #VU17099

Risk: Low

CVSSv3.1: 6.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C]

CVE-ID: CVE-2019-6462

CWE-ID: CWE-835 - Loop with Unreachable Exit Condition ('Infinite Loop')

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to infinite loop in the function _arc_error_normalized in the file cairo-arc.c, related to _arc_max_angle_for_tolerance_normalized. A remote attacker can consume all available system resources and cause denial of service conditions.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Cairo: 1.16.0

External links

http://github.com/TeamSeri0us/pocs/tree/master/gerbv
http://gitlab.freedesktop.org/cairo/cairo/issues/353

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.

2) Reachable Assertion

EUVDB-ID: #VU17100