#VU26415 Resource management error in Bleach - CVE-2020-6817

Vulnerability identifier: #VU26415

Vulnerability risk: Low

CVSSv4.0: 1.2 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2020-6817

CWE-ID: CWE-399

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Bleach
Universal components / Libraries / Libraries used by multiple products

Vendor: Mozilla

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