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Jacob Baines

Principal Research Engineer, Zero Day Research

Jacob Baines's picture

Jacob joined Tenable in 2015 as a reverse engineer for the Nessus plugins team where he analyzed remote code execution vulnerabilities and developed plugins. He was very involved in the team’s malware scanning and YARA implementations. Since joining Tenable, Jacob has 64 CVEs and 51 research advisories credited to his name. He is the founding member of the Zero Day Research team.

In his free time, Jacob enjoys running (slowly), reading, good beer, occasionally contributing to open source projects, and maintaining a regrettably large garden.

[R1] Crestron AM-100 Authentication Bypass

While doing patch analysis on the Crestron AM-100, Tenable discovered a backdoor had been removed in the most recent firmware version (1.6.0.2). Tenable found no documentation for this patch. After sharing this finding with Creston, they confirmed the issue and released a new security advisory.

The backdoor exists in the web interface's return.cgi binary. The logic looks for a noNeedSeid XML node containing the text "SetFlag" where the authenticated user's token should be:

[R2] Netatalk Out-of-bounds Write

Tenable discovered an out-of-bounds write in Netatalk's dsi_opensession() function in dsi_opensess.c. The vulnerable code follows:

memcpy(&dsi->attn_quantum, dsi->commands + i + 1, dsi->commands[i]);

The attn_quantum variable is a 32 bit integer and dsi->commands is attacker controlled. A remote unauthenticated attacker can leverage this to write 251 bytes beyond the attn_quantum in the dsi struct and control code execution.

[R1] Mikrotik RouterOS Multiple Authenticated Vulnerabilities

Tenable has discovered multiple authenticated vulnerabilities in Mikrotik's RouterOS.

CVE-2018-1156: Stack buffer overflow in licupgr

The licupgr binary has a sprintf call that an authenticated user can use to trigger a remote stack buffer overflow. The sprintf is used on the following string:

GET /ssl_conn.php?usrname=%s&passwd=%s&softid=%s&level=%d&pay_type=%d&board=%d HTTP/1.0

Where the user has control of the username and password strings. Tenable's proof of concept results in the following crash dump:

[R1] OpenVPN Windows Service Double Free

Windows installations of OpenVPN are split into three parts:

  1. OpenVPN Service (openvpnserv.exe)
  2. Userland OpenVPN (openvpn.exe)
  3. User Interface

The project is broken up in this way so that non-admin users can establish VPN connections. The user interface communicates with OpenVPN service over a pipe and the service spawns instances of openvpn.exe when escalated privileges are no longer needed.

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