ABB IDAL FTP Server Buffer Overflow

XL-19-007 - ABB IDAL FTP Server Buffer Overflow Vulnerability
========================== XL-19-007 - ABB IDAL FTP Server Buffer Overflow Vulnerability


CVSS Score
6.5 (AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)

Affected vendor

Eldar Marcussen - xen1thLabs - Software Labs

Vulnerability summary
The IDAL FTP server is vulnerable to a buffer overflow where a large string is sent by an authenticated attacker that causes a buffer overflow. This overflow is handled, but terminates the process.

Technical details
An authenticated attacker can send a FTP command string of 472 bytes or more to overflow a buffer causing an exception that terminates the server. An unauthenticated attacker can take advantage of the hardcoded or default credential pair exor/exor to become an authenticated attacker.

Proof of concept
perl -e 'print "USER exor PASS exor " . "A" x 472 . " ";' | nc targetip 22

Affected systems
PB610 Panel Builder 600, order code: 1SAP500900R0101, versions 1.91 ...

Apply the patches and instructions from vendor:
- ABB PB610 -

Disclosure timeline
04/02/2019 - Contacted ABB requesting disclosure coordination
05/02/2019 - Provided vulnerability details
05/06/2019 - Patch available
13/06/2019 - ABB Updated advisory to include this vulnerability
17/06/2019 - xen1thLabs public disclosure

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