CVE-2025-2887
📋 TL;DR
This vulnerability in the tough library allows clients to fetch target files from incorrect sources during delegated target rollbacks, potentially leading to altered file contents. It affects systems using tough versions before 0.20.0 for software update verification. Users of AWS services or other software relying on tough for secure software updates are impacted.
💻 Affected Systems
- tough library
- AWS services using tough
- software using tough for updates
📦 What is this software?
Tough by Amazon
⚠️ Risk & Real-World Impact
Worst Case
Attackers could serve malicious software updates to clients, leading to system compromise, data theft, or supply chain attacks.
Likely Case
Clients receive outdated or incorrect software updates, causing functionality issues or security gaps.
If Mitigated
With proper network segmentation and monitoring, impact is limited to update failures rather than compromise.
🎯 Exploit Status
Requires control of update infrastructure or man-in-the-middle position to exploit.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: tough 0.20.0 or later
Vendor Advisory: https://github.com/awslabs/tough/security/advisories/GHSA-q6r9-r9pw-4cf7
Restart Required: No
Instructions:
1. Update tough dependency to version 0.20.0 or later. 2. Rebuild and redeploy affected applications. 3. Verify update integrity after deployment.
🔧 Temporary Workarounds
Disable delegated targets
allTemporarily disable delegated target functionality if not required
Modify tough configuration to use direct targets only
🧯 If You Can't Patch
- Implement strict network controls around update servers
- Monitor update logs for unexpected source changes
🔍 How to Verify
Check if Vulnerable:
Check tough version in dependency files or runtime: grep -r "tough" package.json Cargo.toml requirements.txtCheck Version:
cargo tree | grep tough # for Rust projectsVerify Fix Applied:
Confirm tough version >= 0.20.0 in dependencies and test rollback scenarios📡 Detection & Monitoring
Log Indicators:
- Unexpected source URLs in update logs
- Rollback failures in tough logs
Network Indicators:
- Update requests to unexpected domains/IPs
- Unusual update traffic patterns
SIEM Query:
source="tough" AND (event="rollback" OR event="target_fetch") AND status="error"