Mageia 9 Security Update: Critical djvulibre Vulnerability Patched (CVE-2025-53367)

 

Mageia 9 patches critical djvulibre vulnerability (CVE-2025-53367)—an out-of-bounds write flaw allowing remote code execution. Learn how to update, mitigate risks, and secure Linux systems against DJVU-based exploits. Includes patch links & security best practices.

Critical Out-of-Bounds Write Vulnerability Fixed in djvulibre

A severe security flaw in djvulibre, a widely used document viewer for DJVU files, has been patched in Mageia Linux 9. 

The vulnerability, tracked as CVE-2025-53367, involved an out-of-bounds write in the MMRDecoder::scanruns method, which could allow arbitrary code execution when a user opens a maliciously crafted document.

This security update (MGASA-2025-0209) addresses the issue, preventing potential exploitation on Linux desktop systems.

🔹 Why is this important?

• Affects Linux users relying on djvulibre for document viewing.

• Exploitable via specially crafted DJVU files, leading to remote code execution (RCE).

• Patched in Mageia 9, with updates available in the core repository.

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Technical Breakdown of the Vulnerability

Root Cause: Out-of-Bounds Write in MMRDecoder

The flaw resided in the MMRDecoder::scanruns function, where improper boundary checks allowed memory corruption. Attackers could craft a malicious DJVU file to trigger this vulnerability, leading to:

• Arbitrary code execution (full system compromise).

• Denial-of-service (DoS) attacks (application crashes).

Affected Systems & Mitigation

Component	Risk Level	Patch Status
djvulibre (Linux)	Critical (RCE)	Fixed in Mageia 9
Ubuntu (via USN-7631-1)	High	Patched

✅ Resolution:
Mageia has released updated djvulibre-3.5.29-1.mga9 packages. Users should apply the patch immediately via:

bash

sudo urpmi --auto-update djvulibre

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Security References & Further Reading

For administrators and security professionals, here are key resources:

• Mageia Bug Report #34423

• Openwall OSS-Security Advisory

• Ubuntu Security Notice (USN-7631-1)

• CVE-2025-53367 Details (MITRE)

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Best Practices for Linux Security

To minimize risks from similar vulnerabilities:

1. Enable automatic security updates (urpmi --auto-update).

2. Avoid opening untrusted DJVU files from unknown sources.

3. Monitor security advisories for Mageia and related Linux distributions.

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FAQ: djvulibre Vulnerability (CVE-2025-53367)

❓ How do I check if my system is vulnerable?

A: Run:

bash

rpm -q djvulibre  

Ensure the version is 3.5.29-1.mga9 or later.

❓ Is this vulnerability being actively exploited?

A: No confirmed attacks yet, but proof-of-concept (PoC) exploits may emerge.

❓ Are other Linux distributions affected?

A: Yes, Ubuntu has patched it (USN-7631-1). Check your distro’s security updates.