FreeXL 'read_biff_next_record()' Function Heap Buffer Overflow Vulnerability

Bugtraq ID:	100807
Class:	Boundary Condition Error
CVE:	CVE-2017-2923
Remote:	Yes
Local:	No
Published:	Sep 11 2017 12:00AM
Updated:	Sep 11 2017 12:00AM
Credit:	Marcin 'Icewall' Noga of Cisco Talos.
Vulnerable:	FreeXL FreeXL 1.0.3
Not Vulnerable:

FreeXL 'read_biff_next_record()' Function Heap Buffer Overflow Vulnerability

FreeXL is prone to a heap-based buffer-overflow vulnerability because it fails to adequately bounds-check user-supplied data before copying it into an insufficiently sized buffer.

Attackers can exploit this issue to execute arbitrary code in the context of the affected application. Failed exploit attempts will result in denial-of-service conditions.

FreeXL 1.0.3 is vulnerable; other versions may also be affected.

FreeXL 'read_biff_next_record()' Function Heap Buffer Overflow Vulnerability

The researcher has created a proof-of-concept to demonstrate the issue. Please see the references for more information.

FreeXL 'read_biff_next_record()' Function Heap Buffer Overflow Vulnerability

Solution:
Currently, we are not aware of any vendor-supplied patches. If you feel we are in error or if you are aware of more recent information, please mail us at: [email protected].

FreeXL 'read_biff_next_record()' Function Heap Buffer Overflow Vulnerability

References:

• FreeXL Homepage (FreeXL)
  
• TALOS-2017-0430 FreeXL read_biff_next_record Code Execution Vulnerability (Talos Intelligence)