Executive Summary

This vulnerability exists in OpenProject, a web-based project management software, prior to versions 16.6.7 and 17.0.3. It is an arbitrary file write vulnerability in the repository changes endpoint when rendering the "latest changes" view via git log.

An attacker can supply a specially crafted 'rev' value that injects git log command-line options. When OpenProject executes the SCM command, Git interprets this attacker-controlled input as an option and writes output to a file path chosen by the attacker.

Any user with the :browse_repository permission can create or overwrite arbitrary files that the OpenProject process user can write to. The contents written are git log output, but by crafting custom commits, an attacker can upload valid shell scripts, leading to remote code execution (RCE).

This RCE allows the attacker to create a reverse shell to the target host and access confidential files outside of OpenProject, such as /etc/passwd.

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Impact Analysis

This vulnerability can have severe impacts including unauthorized file creation or overwriting on the server running OpenProject.

It enables remote code execution, allowing attackers to execute arbitrary commands on the server.

Attackers can gain a reverse shell, potentially leading to full system compromise.

Confidential files outside of OpenProject, such as system files like /etc/passwd, can be accessed by the attacker.

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Compliance Impact

I don't know

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Detection Guidance

I don't know

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Mitigation Strategies

The vulnerability has been patched in OpenProject versions 16.6.7 and 17.0.3. Immediate mitigation involves upgrading your OpenProject installation to at least one of these versions.

Additionally, restrict the :browse_repository permission to trusted users only, as any user with this permission can exploit the vulnerability.

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