CVE-2020-35342
📋 TL;DR
CVE-2020-35342 is an uninitialized heap vulnerability in GNU Binutils' tic4x disassembler that allows attackers to leak sensitive information from memory. This affects systems using Binutils for binary analysis or development tools. The vulnerability could expose process memory contents including potentially sensitive data.
💻 Affected Systems
- GNU Binutils
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Attackers could extract sensitive information like encryption keys, passwords, or other process memory contents, potentially leading to further system compromise.
Likely Case
Information disclosure of random heap memory contents, which may include fragments of sensitive data or application state.
If Mitigated
Limited impact with proper access controls and isolation of Binutils tools from sensitive systems.
🎯 Exploit Status
Exploitation requires the attacker to trigger the vulnerable disassembler function with specific malformed input.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 2.34 and later
Vendor Advisory: https://sourceware.org/bugzilla/show_bug.cgi?id=25319
Restart Required: No
Instructions:
1. Update Binutils package using system package manager (apt-get upgrade binutils, yum update binutils, etc.)
2. Verify installation of version 2.34 or later
3. Recompile any tools or applications that statically link Binutils libraries
🔧 Temporary Workarounds
Disable tic4x disassembler
linuxRemove or restrict access to the vulnerable component if tic4x architecture support is not needed
# Check if tic4x support is present
objdump --info | grep tic4x
# Consider removing or restricting permissions to Binutils tools
🧯 If You Can't Patch
- Isolate Binutils tools from production systems and sensitive data
- Implement strict access controls and monitoring on systems with vulnerable Binutils
🔍 How to Verify
Check if Vulnerable:
Check Binutils version: ld --version | head -1Check Version:
ld --version | head -1Verify Fix Applied:
Verify version is 2.34 or higher: ld --version | grep -q '2\.3[4-9]\|2\.[4-9]' && echo 'Patched'📡 Detection & Monitoring
Log Indicators:
- Unusual process memory access patterns
- Multiple failed disassembly attempts on tic4x binaries
Network Indicators:
- Not network exploitable - local vulnerability
SIEM Query:
Process execution of objdump, readelf, or other Binutils tools with unusual arguments or error conditions