Vulnerability identifier: #VU52846

Vulnerability risk: Medium

CVSSv3.1: 4.6 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-31866

CWE-ID: CWE-200

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Redmine
Web applications / CRM systems

Vendor: Ruby

Description

The vulnerability allows a remote attacker to gain access to potentially sensitive information.

The vulnerability exists due to excessive data output by the application. A remote attacker can learn the values of internal authentication keys by observing timing differences in string comparison operations within SysController and MailHandlerController.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Redmine: 4.0.0, 4.0.1, 4.0.2, 4.0.3, 4.0.4, 4.0.5, 4.0.6, 4.0.7, 4.0.8, 4.1.0, 4.1.1, 4.1.2

CPE

• cpe:2.3:a:ruby:redmine:4.0.0:*:*:*:*::*:*
• cpe:2.3:a:ruby:redmine:4.0.1:*:*:*:*::*:*
• cpe:2.3:a:ruby:redmine:4.0.2:*:*:*:*::*:*
• cpe:2.3:a:ruby:redmine:4.0.3:*:*:*:*::*:*
• cpe:2.3:a:ruby:redmine:4.0.4:*:*:*:*::*:*
• cpe:2.3:a:ruby:redmine:4.0.5:*:*:*:*::*:*
• cpe:2.3:a:ruby:redmine:4.0.6:*:*:*:*::*:*
• cpe:2.3:a:ruby:redmine:4.0.7:*:*:*:*::*:*
• cpe:2.3:a:ruby:redmine:4.0.8:*:*:*:*::*:*
• cpe:2.3:a:ruby:redmine:4.1.2:*:*:*:*::*:*
• cpe:2.3:a:ruby:redmine:4.1.1:*:*:*:*::*:*
• cpe:2.3:a:ruby:redmine:4.1.0:*:*:*:*::*:*

External links
https://www.redmine.org/projects/redmine/wiki/Security_Advisories
https://www.redmine.org/news/131

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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.