CVE-2021-28874
📋 TL;DR
This vulnerability allows remote attackers to execute arbitrary code or cause a denial of service via a crafted file that triggers a buffer overflow in SerenityOS's LibTextCode library. It affects users who open untrusted files in SerenityOS. The vulnerability is fixed in the specified commit.
💻 Affected Systems
- SerenityOS
📦 What is this software?
Serenityos by Serenityos
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete system compromise if exploited successfully.
Likely Case
Application crash or denial of service when processing malicious files.
If Mitigated
No impact if patched or if untrusted files are not opened.
🎯 Exploit Status
Exploitation requires user to open a crafted file; no authentication needed but user interaction is required.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Commit c9f25bca048443e317f1994ba9b106f2386688c3 and later
Vendor Advisory: https://github.com/SerenityOS/serenity/commit/c9f25bca048443e317f1994ba9b106f2386688c3
Restart Required: Yes
Instructions:
1. Update SerenityOS to commit c9f25bca048443e317f1994ba9b106f2386688c3 or later. 2. Rebuild and reinstall the OS. 3. Restart the system.
🔧 Temporary Workarounds
Restrict file opening
allAvoid opening untrusted files in SerenityOS applications that use LibTextCode.
🧯 If You Can't Patch
- Implement strict file type validation and sandboxing for file processing applications.
- Monitor for crashes in applications using LibTextCode and investigate any anomalies.
🔍 How to Verify
Check if Vulnerable:
Check if SerenityOS version is before commit c9f25bca048443e317f1994ba9b106f2386688c3 using git log or version command.Check Version:
git log --oneline -1Verify Fix Applied:
Verify the system is running commit c9f25bca048443e317f1994ba9b106f2386688c3 or later.📡 Detection & Monitoring
Log Indicators:
- Application crashes or segmentation faults when opening files
- Unexpected process terminations in LibTextCode-related applications
Network Indicators:
- Inbound file transfers followed by application crashes
SIEM Query:
Process:Terminated AND (ImagePath:*serenity* OR CommandLine:*LibTextCode*)🔗 References
- https://github.com/SerenityOS/serenity/commit/c9f25bca048443e317f1994ba9b106f2386688c3
- https://github.com/SerenityOS/serenity/issues/5769
- https://github.com/SerenityOS/serenity/pull/5802
- https://github.com/SerenityOS/serenity/commit/c9f25bca048443e317f1994ba9b106f2386688c3
- https://github.com/SerenityOS/serenity/issues/5769
- https://github.com/SerenityOS/serenity/pull/5802
