CVE-2021-28879
📋 TL;DR
This vulnerability in Rust's standard library before version 1.52.0 involves an integer overflow in the Zip iterator implementation. When a consumed Zip iterator is reused, it can report incorrect size information, potentially leading to buffer overflow conditions. This affects any Rust application using the standard library's Zip functionality.
💻 Affected Systems
- Rust programming language standard library
📦 What is this software?
Fedora by Fedoraproject
Fedora by Fedoraproject
Fedora by Fedoraproject
Rust by Rust Lang
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete system compromise, data theft, or service disruption.
Likely Case
Application crashes, denial of service, or memory corruption leading to unpredictable behavior.
If Mitigated
Limited impact with proper memory protections and sandboxing, potentially just crashes.
🎯 Exploit Status
Exploitation requires specific conditions with Zip iterator reuse, but public details exist in the GitHub issue.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Rust 1.52.0 and later
Vendor Advisory: https://github.com/rust-lang/rust/issues/82282
Restart Required: Yes
Instructions:
1. Update Rust toolchain to version 1.52.0 or later using rustup update. 2. Recompile all Rust applications with the updated toolchain. 3. Redeploy updated applications.
🔧 Temporary Workarounds
Avoid Zip Iterator Reuse
allModify code to avoid reusing consumed Zip iterators
🧯 If You Can't Patch
- Implement strict input validation and sanitization for all data processed by Zip iterators
- Deploy applications in sandboxed environments with memory protection features enabled
🔍 How to Verify
Check if Vulnerable:
Check Rust version with 'rustc --version' and verify it's below 1.52.0Check Version:
rustc --versionVerify Fix Applied:
Verify Rust version is 1.52.0 or higher with 'rustc --version'📡 Detection & Monitoring
Log Indicators:
- Application crashes with segmentation faults
- Memory access violation errors
- Unexpected termination of Rust applications
Network Indicators:
- Unusual traffic patterns to Rust-based services
- Exploit attempt signatures if known
SIEM Query:
source="application_logs" AND ("segmentation fault" OR "memory violation" OR "rust panic")🔗 References
- https://github.com/rust-lang/rust/issues/82282
- https://github.com/rust-lang/rust/pull/82289
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CZ337CM4GFJLRDFVQCGC7J25V65JXOG5/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TFUO3URYCO73D2Q4WYJBWAMJWGGVXQO4/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VZG65GUW6Z2CYOQHF7T3TB5CZKIX6ZJE/
- https://security.gentoo.org/glsa/202210-09
- https://github.com/rust-lang/rust/issues/82282
- https://github.com/rust-lang/rust/pull/82289
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CZ337CM4GFJLRDFVQCGC7J25V65JXOG5/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TFUO3URYCO73D2Q4WYJBWAMJWGGVXQO4/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VZG65GUW6Z2CYOQHF7T3TB5CZKIX6ZJE/
- https://security.gentoo.org/glsa/202210-09
