Denial of service in Mozilla Bleach

1) Resource management error

EUVDB-ID: #VU26415

Risk: Low

CVSSv3.1: 3.8 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-6817

CWE-ID: CWE-399 - Resource Management Errors

Exploit availability: No

Description

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

The vulnerability exists due to improper input validation when parsing style attrbitues. A remote attacker can create a specially crafted web page that can result in regular expression denial of service (ReDoS).

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Bleach: 2.1 - 3.1.3

External links

http://github.com/mozilla/bleach/releases/tag/v3.1.4
http://bugzilla.mozilla.org/show_bug.cgi?id=1623633
http://github.com/mozilla/bleach/commit/d6018f2539d271963c3e7f54f36ef11900363c69

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.