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This vulnerability occurs in Rust’s user management crate when handling group listings. If a user or process has fewer than 1024 groups, the system erroneously appends the `root` group to the access list. This misclassification allows unauthorized privilege escalation, as processes or users gain unintended root-level permissions. The flaw stems from improper boundary checks in group enumeration logic, where an off-by-one error or incorrect buffer handling injects the `root` group ID (GID 0) into non-privileged contexts. Attackers exploiting this can escalate privileges, modify system files, or bypass security restrictions.
DailyCVE Form:
Platform: GitHub
Version: Rust user crate
Vulnerability: Privilege escalation
Severity: High
Date: Jun 6, 2025
Prediction: Patch by Jun 20, 2025
What Undercode Say:
Analytics:
- Exploitability: Moderate (requires group enumeration)
- Attack Vector: Local privilege escalation
- Impact: Full root compromise
Exploit Commands:
1. List groups to trigger flaw:
id -Gn <target_user>
2. Force group enumeration via Rust:
use users::Groups; let _ = Users::current().groups().unwrap();
Mitigation Code:
- Patch check in Rust:
fn validate_groups(groups: &[bash]) -> bool { !groups.contains(&0) }
Temporary Fix:
- Revoke unnecessary group memberships:
sudo gpasswd -d <user> root
Detection Script:
!/bin/sh if id -Gn | grep -q "root"; then echo "Vulnerable: root group appended"; fi
Log Monitoring:
grep "group.0" /var/log/auth.log
Patch Verification:
assert!(Users::current().groups().unwrap().iter().all(|g| g.id() != 0));
Sources:
Reported By: github.com
Extra Source Hub:
Undercode
