CVE-2023-46316: Buc Traceroute Command Parsing Vulnerability

CVE-2023-46316 Overview

CVE-2023-46316 is an improper input validation vulnerability affecting buc Traceroute versions 2.0.12 through 2.1.2. The vulnerability exists in the wrapper scripts which do not properly parse command lines, potentially allowing local attackers to manipulate the application's behavior. This flaw can be exploited by authenticated local users to cause a denial of service condition or potentially escalate privileges on affected systems.

Critical Impact

Local attackers can exploit improper command line parsing in Traceroute wrapper scripts to cause denial of service or potentially escalate privileges on Linux systems running vulnerable versions.

Affected Products

• buc Traceroute versions 2.0.12 through 2.1.2
• Debian Linux 10.0
• Debian Linux 11.0
• Debian Linux 12.0

Discovery Timeline

• 2023-10-25 - CVE-2023-46316 published to NVD
• 2024-11-21 - Last updated in NVD database

Technical Details for CVE-2023-46316

Vulnerability Analysis

The vulnerability stems from improper handling of command line arguments within the Traceroute wrapper scripts. When processing user-supplied input, these scripts fail to adequately validate and sanitize command line parameters before passing them to the underlying traceroute binary. This parsing weakness creates an opportunity for local users to inject malicious arguments or manipulate the execution flow of the application.

The traceroute utility is commonly installed with elevated privileges (setuid) on Linux systems to allow network diagnostic operations that require raw socket access. When the wrapper scripts improperly handle command line arguments, attackers can potentially abuse this privileged execution context to cause system instability or gain elevated access.

Root Cause

The root cause of CVE-2023-46316 lies in CWE-234 (Failure to Handle Missing Parameter) combined with general input validation deficiencies in the wrapper scripts. The scripts do not implement robust parsing logic to handle edge cases, malformed input, or specially crafted command line arguments. This oversight allows attackers to pass unexpected parameters that bypass security controls or trigger unintended behavior in the privileged traceroute process.

Attack Vector

This vulnerability requires local access to exploit, meaning an attacker must have an authenticated session on the target system. The attack complexity is low, requiring no special conditions or significant technical expertise to exploit. An attacker can craft malicious command line arguments and pass them through the vulnerable wrapper scripts.

The exploitation path involves:

1. Identifying a system running vulnerable Traceroute versions (2.0.12 through 2.1.2)
2. Crafting command line arguments that exploit the parsing weakness
3. Executing the traceroute wrapper script with the malicious arguments
4. Achieving denial of service through resource exhaustion or potentially escalating privileges

For detailed technical analysis and exploit methodology, refer to the Packet Storm Exploit Report.

Detection Methods for CVE-2023-46316

Indicators of Compromise

• Unusual traceroute process executions with malformed or suspicious command line arguments
• Unexpected privilege escalation attempts involving the traceroute binary
• System logs showing repeated traceroute failures or abnormal error messages
• Process crashes or resource exhaustion related to traceroute wrapper scripts

Detection Strategies

• Monitor system calls and command executions involving /usr/bin/traceroute and associated wrapper scripts for anomalous argument patterns
• Implement file integrity monitoring on traceroute binaries and wrapper scripts to detect unauthorized modifications
• Deploy endpoint detection solutions that can identify privilege escalation attempts via setuid binaries
• Review system authentication logs for suspicious local user activity preceding traceroute executions

Monitoring Recommendations

• Configure audit rules to log all executions of traceroute and related utilities with full command line arguments
• Implement process monitoring to detect traceroute processes spawned with unusual parent processes or execution contexts
• Set up alerts for repeated traceroute failures or crashes that may indicate exploitation attempts
• Monitor for unexpected network diagnostic tool usage patterns that deviate from baseline behavior

How to Mitigate CVE-2023-46316

Immediate Actions Required

• Upgrade buc Traceroute to version 2.1.3 or later immediately on all affected systems
• Audit systems to identify all instances of vulnerable Traceroute versions (2.0.12 through 2.1.2)
• Restrict local shell access to trusted users only until patches are applied
• Review recent system logs for any indicators of exploitation attempts

Patch Information

The vulnerability has been addressed in buc Traceroute version 2.1.3. The patched version includes fixes for the command line parsing issues in the wrapper scripts. Administrators should download the updated package from the official SourceForge repository.

For Debian-based systems, consult the Debian Security Tracker for distribution-specific patch availability and update instructions.

Workarounds

• Remove setuid permissions from the traceroute binary if network diagnostics requiring raw sockets are not needed: chmod u-s /usr/bin/traceroute
• Restrict execution permissions on wrapper scripts to trusted administrators only
• Consider using alternative network diagnostic tools that are not affected by this vulnerability until patching is complete
• Implement application whitelisting to prevent unauthorized execution of traceroute with suspicious arguments

# Temporary mitigation: Remove setuid and restrict permissions
chmod u-s /usr/bin/traceroute
chmod 750 /usr/bin/traceroute
chown root:admin /usr/bin/traceroute

# Verify Traceroute version
traceroute --version

# Update on Debian-based systems
apt update && apt upgrade traceroute