提出 #773796: sigmade Git-MCP-Server <=1.0.0 Command Injection

A command injection vulnerability exists in Git-MCP-Server due to unsafe use of child_process.exec when constructing Git commands with user-controlled input. Successful exploitation allows attackers to execute arbitrary shell commands with the privileges of the MCP server process.
The following MCP tools construct command strings using user-supplied parameters and execute them via child_process.exec:
 show_merge_diff: interpolates fromBranch and toBranch parameters
 quick_merge_summary: interpolates branch parameter
 show_file_diff: interpolates filename, fromBranch, and toBranch parameters
Because exec invokes commands through a system shell, specially crafted input containing shell metacharacters (such as `;`, `&`, or `|`) may be interpreted as additional commands rather than treated as data.
For example, an attacker could supply a malicious value in fromBranch to inject arbitrary shell commands, which would then be executed with the privileges of the MCP server process.
The vulnerability results from shell-based command execution combined with direct interpolation of untrusted input. In MCP environments, LLM-generated tool parameters influenced by external content may trigger execution of injected commands without direct local user interaction.
Vulnerable lines of code (show_merge_diff):
(Command construction with user input): https://github.com/sigmade/Git-MCP-Server/blob/ma
ster/src/gitUtils.ts#L36-L39
(Parameter definition without validation): https://github.com/sigmade/Git-MCP-Server/blob/ma
ster/src/index.ts#L28-L50
(Unsafe execSync() call): https://github.com/sigmade/Git-MCP-Server/blob/master/src/gitUtils.t
s#L14-L16

• ソース: ⚠️ https://github.com/sigmade/Git-MCP-Server/issues/1
• ユーザー: Yinci Chen (UID 94659)
• 送信: 2026年03月06日 08:10 (3 月 ago)
• モデレーション: 2026年03月20日 10:16 (14 days later)
• ステータス: 承諾済み
• VulDBエントリ: 352045 [sigmade Git-MCP-Server 迄 785aa159f262a02d5791a5d8a8e13c507ac42880 src/gitUtils.ts child_process.exec 特権昇格]
• ポイント: 20