CVE-2024-52005: Git XSS via ANSI Escape Sequences Vulnerability

CVE-2024-52005 Overview

CVE-2024-52005 is a high-severity vulnerability in Git, the widely-used source code management tool. The vulnerability exists in Git's "sideband channel," which is used to transport informational or error messages from a remote Git server to the client during clone, fetch, or push operations. These messages are prefixed with "remote:" and printed directly to the standard error output without proper sanitization of ANSI escape sequences.

Since most modern terminals interpret ANSI control sequences, a malicious actor operating a Git server can inject carefully crafted escape sequences into sideband messages. This can be exploited to hide or misrepresent information displayed to the user, or potentially mislead users into executing untrusted scripts.

Critical Impact

Attackers can leverage malicious Git servers to inject ANSI escape sequences that manipulate terminal output, potentially deceiving users into running untrusted code or hiding malicious activity during Git operations.

Affected Products

• Git (multiple versions affected)
• Git-based tools and applications that process sideband messages
• Development environments using Git for source control

Discovery Timeline

• January 15, 2025 - CVE-2024-52005 published to NVD
• December 18, 2025 - Last updated in NVD database

Technical Details for CVE-2024-52005

Vulnerability Analysis

This vulnerability is classified as CWE-116 (Improper Encoding or Escaping of Output). The core issue stems from Git's failure to sanitize ANSI escape sequences in messages received through the sideband channel during client-server communications.

When a user performs Git operations that communicate with a remote server (such as git clone, git fetch, or git push), the server can send messages through a dedicated sideband channel. These messages are intended for informational purposes and are displayed directly in the user's terminal with a "remote:" prefix.

The vulnerability requires network access and user interaction (the user must initiate a Git operation against a malicious server). When exploited, an attacker can achieve high impact on confidentiality, integrity, and availability by manipulating what the user sees during Git operations.

Root Cause

The root cause is insufficient output encoding when Git processes sideband messages. Git fails to escape or filter ANSI control sequences before writing them to standard error, trusting that server-provided content is safe for terminal display. Modern terminals interpret these escape sequences for cursor positioning, text color changes, screen clearing, and other display manipulations that can be abused by attackers.

Attack Vector

The attack vector is network-based, requiring a malicious Git server to deliver the payload. An attacker could:

1. Set up a malicious Git repository server
2. Trick a victim into cloning or fetching from this server
3. Send crafted sideband messages containing ANSI escape sequences
4. Manipulate the terminal display to hide malicious content, display fake information, or deceive the user into taking harmful actions

The vulnerability is particularly dangerous in scenarios involving recursive clones from untrusted sources, where submodule URLs could point to attacker-controlled servers.

A proof-of-concept exploit is publicly available. Exploitation involves crafting sideband messages with ANSI escape sequences that can overwrite terminal content, hide warnings, or display misleading information to users. Technical details are available in the GitHub Security Advisory.

Detection Methods for CVE-2024-52005

Indicators of Compromise

• Unexpected terminal behavior during Git clone, fetch, or push operations
• Terminal output that appears manipulated, cleared, or contains unusual formatting
• Git operations connecting to unfamiliar or suspicious remote URLs
• Submodule configurations pointing to untrusted external repositories

Detection Strategies

• Monitor Git command execution for connections to unexpected or untrusted remote servers
• Implement network monitoring to detect Git protocol communications to suspicious IP addresses
• Review .gitmodules files in repositories for potentially malicious submodule URLs
• Use endpoint detection to flag unusual terminal escape sequences in process output

Monitoring Recommendations

• Enable logging for all Git operations in development environments
• Monitor for recursive clone operations from external sources
• Track Git configuration changes, particularly remote URL modifications
• Implement alerting for Git operations involving unknown or recently registered domains

How to Mitigate CVE-2024-52005

Immediate Actions Required

• Update Git to the latest patched version immediately
• Audit existing repositories for submodules pointing to untrusted sources
• Educate developers about the risks of cloning from untrusted repositories
• Consider restricting Git operations to approved repository sources in enterprise environments

Patch Information

A security patch has been developed and discussed on the public Git mailing list. Users should update Git to the latest available version that includes the fix. Refer to the GitHub Security Advisory for specific version information and patch details.

Additional technical discussion is available on the Kernel Mailing List.

Workarounds

• Avoid recursive clones (--recursive or --recurse-submodules) unless the source repository is fully trusted
• Manually inspect .gitmodules files before initializing submodules
• Use terminal emulators with ANSI escape sequence filtering capabilities when performing Git operations
• Consider using Git in non-interactive modes or redirecting output when working with untrusted sources

# Safe cloning practice - avoid recursive clone for untrusted sources
git clone --no-recurse-submodules <repository-url>

# Inspect submodules before initializing
cat .gitmodules
git submodule status

# Only initialize after verifying submodule URLs are trusted
git submodule update --init