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CVE-2021-32763— Regular Expression Denial of Service in OpenProject forum messages

Quick assessment

Affected
opf openproject
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

OpenProject是一套开源的基于Web的项目管理软件。该软件具有项目规划、任务管理、错误跟踪和成本预算等功能。 OpenProject 中存在安全漏洞。该漏洞源于网络系统或产品对系统资源（如内存、磁盘空间、文件等）的管理不当。

CVSS 4.3 · Medium EPSS 0.92% · P59

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2021-32763

Vulnerability Information
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Vulnerability Title
Regular Expression Denial of Service in OpenProject forum messages
Source: CVE Program / CVE List V5
Vulnerability Description
OpenProject is open-source, web-based project management software. In versions prior to 11.3.3, the `MessagesController` class of OpenProject has a `quote` method that implements the logic behind the Quote button in the discussion forums, and it uses a regex to strip `<pre>` tags from the message being quoted. The `(.|\s)` part can match a space character in two ways, so an unterminated `<pre>` tag containing `n` spaces causes Ruby's regex engine to backtrack to try 2<sup>n</sup> states in the NFA. This will result in a Regular Expression Denial of Service. The issue is fixed in OpenProject 11.3.3. As a workaround, one may install the patch manually.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5
Vulnerability Title
OpenProject安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
OpenProject是一套开源的基于Web的项目管理软件。该软件具有项目规划、任务管理、错误跟踪和成本预算等功能。 OpenProject 中存在安全漏洞。该漏洞源于网络系统或产品对系统资源（如内存、磁盘空间、文件等）的管理不当。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
opf openproject < 11.3.3 -

II. Public POCs for CVE-2021-32763

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III. Intelligence Information for CVE-2021-32763

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Patches & Fixes for CVE-2021-32763 (1)

Vendor Advisories for CVE-2021-32763 (1)

IV. Related Vulnerabilities

Same product: openproject
Same vendor: opf
Same weakness: CWE-400

V. Comments for CVE-2021-32763

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