Security: executable archives downloaded over plain HTTP with hash verification disabled (nohash) - MITM code execution
维护者通常 1 天内回复
还没有人认领这个 Issue。
评估
- 难度
- 4/5
- 预计耗时
- 3-5 天
- 新手友好度
- 52/100
调研方向
先从 lgsm/modules/core_steamcmd.sh、update_mta.sh 和 command_install_resources_mta.sh 中受影响的调用点开始，然后阅读 core_dl.sh 第 217 行和第 445 行附近的内容。比较 install_server_files.sh 中的校验和处理方式。完成的标准是：这些可执行归档在解压前使用 HTTPS 并进行校验和验证，同时 SteamCMD 和 MTA 的安装或更新路径仍能正常工作。
由索引模型根据 Issue 内容生成。
描述
Security report (responsible disclosure)
Executable archives fetched over plain HTTP with hash verification disabled (nohash) — MITM code execution
Affected files:
lgsm/modules/core_steamcmd.sh:17-19lgsm/modules/update_mta.sh:12-13lgsm/modules/command_install_resources_mta.sh:17-18
fn_fetch_file "http://media.steampowered.com/client/steamcmd_linux.tar.gz" "" "" "" "${tmpdir}" "steamcmd_linux.tar.gz" "nochmodx" "norun" "noforce" "nohash"
fn_dl_extract "${tmpdir}" "steamcmd_linux.tar.gz" "${steamcmddir}"
chmod +x "${steamcmddir}/steamcmd.sh"
fn_fetch_file "http://linux.mtasa.com/dl/multitheftauto_linux_x64.tar.gz" ... "force" "nohash"
Chain
curl -L over plain HTTP (core_dl.sh:445) on first steamcmd install and on MTA updates → nohash bypasses fn_dl_hash entirely (core_dl.sh:217) → archive extracted into ${steamcmddir} / ${serverfiles} → steamcmd.sh is chmod +x'd and executed by every subsequent update/start; MTA binaries run at server start, and MTA resources execute as Lua inside the game server.
Any network attacker on path (or DNS hijack — no TLS involved) replaces the payload and gets shell execution as the LinuxGSM user, re-triggered automatically by update crons.
Severity
High — unauthenticated network position → persistent code execution.
Suggested fix
Serve both URLs over HTTPS (both hosts support it), and pin sha256 checksums the way install_server_files.sh already does for its tarballs. The existing MD5 pinning there is better than nothing but sha256 would be the modern baseline.
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