Description

MajorDoMo (aka Major Domestic Module) is vulnerable to unauthenticated OS command injection via rc/index.php. The $param variable from user input is interpolated into a command string within double quotes without sanitization via escapeshellarg(). The command is inserted into a database queue by safe_exec(), which performs no sanitization. The cycle_execs.php script, which is web-accessible without authentication, retrieves queued commands and passes them directly to exec(). An attacker can exploit a race condition by first triggering cycle_execs.php (which purges the queue and enters a polling loop), then injecting a malicious command via the rc endpoint while the worker is polling. The injected shell metacharacters expand inside double quotes, achieving remote code execution within one second.

Weaknesses 1

Affected Products 1

References 3

• chocapikk.com https://chocapikk.com/posts/2026/majordomo-revisited/
  Third Party AdvisoryExploit
• github.com https://github.com/sergejey/majordomo/pull/1177
  Issue TrackingExploit
• vulncheck.com https://www.vulncheck.com/advisories/majordomo-command-injection-in-rcindexphp-via-race-condition
  Third Party Advisory

Remediation