Denial of service in Action Mailer

1) Inefficient regular expression complexity

EUVDB-ID: #VU99670

Risk: Medium

CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2024-47889

CWE-ID: CWE-1333 - Inefficient Regular Expression Complexity

Exploit availability: No

Description

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

The vulnerability exists due to insufficient input validation when processing untrusted input with a regular expressions in the block_format helper. A remote attacker can pass specially crafted data to the application and perform regular expression denial of service (ReDos) attack.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Action Mailer: 3.0.0 - 7.2.1

CPE2.3

• cpe:2.3:a:rails:actionmailer:7.1.4:*:*:*:*:*:*:*
• cpe:2.3:a:rails:actionmailer:7.2.1:*:*:*:*:*:*:*
• cpe:2.3:a:rails:actionmailer:7.2.0:*:*:*:*:*:*:*

External links

http://github.com/rails/rails/security/advisories/GHSA-h47h-mwp9-c6q6
http://github.com/rails/rails/commit/0e5694f4d32544532d2301a9b4084eacb6986e94
http://github.com/rails/rails/commit/3612e3eb3fbafed4f85e1c6ea4c7b6addbb0fdd3
http://github.com/rails/rails/commit/985f1923fa62806ff676e41de67c3b4552131ab9
http://github.com/rails/rails/commit/be898cc996986decfe238341d96b2a6573b8fd2e

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.