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CVE-2024-54143 is a critical vulnerability discovered within the OpenWrt Attended SysUpgrade server framework.
The Attended SysUpgrade system enables automated firmware builds and updates for network devices.
It allows users to upgrade their routers while preserving existing packages and configurations.
The vulnerability specifically involves a truncated SHA-256 hash collision weakness.
Attackers can manipulate firmware compilation to generate matching truncated hash values.
This cryptographic weakness allows malicious actors to poison the build artifact cache.
When a legitimate upgrade request is processed, the server serves the malicious image instead.
The system accepts the compromised binary because the truncated verification check succeeds.
Unsuspecting users download and install the malicious firmware onto their network routers.
Successful exploitation grants the attacker full control over the affected OpenWrt device.
The flaw bypasses standard integrity checks implemented in older ASU server versions.
Remediation requires upgrading the validation logic to use full-length cryptographic hashes.
Security advisories were rapidly issued by the OpenWrt project to address this critical risk.
Administrators managing custom ASU instances must update their software immediately.
Failing to patch leaves connected IoT and enterprise networking infrastructure vulnerable.
Automated tools and vulnerability scanners help identify outdated firmware build pipelines.
Timesys Vigiles and similar platforms assist in tracking package vulnerabilities effectively.
Proper cryptographic verification is essential for secure automated firmware delivery systems.
The incident underscores the dangers of relying on shortened cryptographic hash strings.
Security teams continue to monitor build servers for signs of unauthorized cache tampering.
DailyCVE Form:
Platform: OpenWrt ASU Server
Version: Prior to 2024
Vulnerability: Hash collision flaw
Severity: Critical severity level
Date: December 12 2024
Prediction: Patched in December
What Undercode Say:
git clone https://github.com/TimesysGit/vigiles-openwrt.git cd vigiles-openwrt ./vigiles-openwrt.py -b /path/to/openwrt -o /path/to/output
Verify full SHA-256 integrity instead of truncated hashes import hashlib def verify_full_hash(file_path, expected_hash): sha256_hash = hashlib.sha256() with open(file_path, "rb") as f: for byte_block in iter(lambda: f.read(4096), b""): sha256_hash.update(byte_block) return sha256_hash.hexdigest() == expected_hash
Exploit: (Educational Purposes!)
Conceptual demonstration of collision testing against vulnerable truncation checks openssl dgst -sha256 firmware.bin Truncated hash extraction simulation for testing validation routines sha256sum firmware.bin | cut -c1-16
Protection: from this CVE
Update the Attended SysUpgrade server to the latest secure version immediately.
Enforce full-length SHA-256 hash verification instead of truncated hash checks.
Implement strict cache validation mechanisms to prevent artifact poisoning.
Monitor build server logs for anomalous firmware generation requests.
Impact:
Complete remote compromise of affected OpenWrt router installations.
Unauthorized execution of arbitrary firmware code on networking devices.
Potential widespread supply chain attacks via poisoned build caches.
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Sources:
Reported By: github.com
Extra Source Hub:
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