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ABB IDAL FTP Server Buffer Overflow

ABB IDAL FTP Server Buffer Overflow
Posted Jun 21, 2019
Authored by Eldar Marcussen

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. 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.

tags | exploit, overflow
advisories | CVE-2019-7231
MD5 | fc10a0c030b5fa18e687345426253408

ABB IDAL FTP Server Buffer Overflow

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

Identifiers
-----------
XL-19-007
CVE-2019-7231
ABBVU-IAMF-1902010


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


Affected vendor
---------------
ABB (new.abb.com)


Credit
------
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\r\nPASS exor\r\n" . "A" x 472 . "\r\n";' | nc targetip 22
```

Affected systems
----------------
PB610 Panel Builder 600, order code: 1SAP500900R0101, versions 1.91 ... 2.8.0.367

Solution
--------
Apply the patches and instructions from vendor:
- ABB PB610 - https://search.abb.com/library/Download.aspx?DocumentID=3ADR010377&LanguageCode=en&DocumentPartId=&Action=Launch


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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