Home / vulnerabilities firefoxzaptel-dos.txt
Posted on 23 October 2007
Source : packetstormsecurity.org Link
Eleytt Research
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Overview:
====================
Michal Bucko, Eleytt, http://www.eleytt.com/michal.bucko
Tomasz Polis, Eleytt, http://www.eleytt.com/
Credit:
====================
Michal Bucko, Eleytt, www.eleytt.com/michal.bucko
Vulnerability Table
===================
1. Firefox 2.0.0.7 ParseFTPList Remote Denial of Service Vulnerability
2. Zaptel 1.4.5.1 SetHDLC.c Local Buffer Overflow Vulnerability
Vulnerability Details
=========================
=========================
1. Firefox 2.0.0.7 ParseFTPList Remote Denial of Service Vulnerability
===================================================================
Firefox 2.0.0.7 is prone to remote denial of service vulnerability. This
can be achieved via enticing the unaware victim to open a specially
crafted ftp server. While listing files (ParseFTPList.cpp), reading
from invalid pointer occurs that results in denial of service conditions.
004C848E |. 8985 5CFFFFFF |MOV DWORD PTR SS:[EBP-A4],EAX
004C8494 |. 8B00 |MOV EAX,DWORD PTR DS:[EAX]
004C8496 |. 0FBE00 |MOVSX EAX,BYTE PTR DS:[EAX]; here is the crash
In ParseFTPList.cpp 'pos' is not properly sanitized, thus
an out of
bounds array access (on line 1039; 'pos' can be greater than the
number of indices in the 'tokens' array).
The exploitation of the vulnerability has been proven using a FTP
server and a specially crafted file. Firefox failed to handle the
FTP list parsing.
Note that Firefox 2.0.0.8 is not vulnerable. Special thanks to
iDefense and Mozilla community for the cooperation.
2. Zaptel 1.4.5.1 SetHDLC.c Local Buffer Overflow Vulnerability
====================================================================
Zaptel 1.4.5.1 is prone to buffer overflow vulnerability when copying
user-supplied device name to req.ifr_name (sethdlc.c), where req is an
object of ifreq (type).
Linux supports some standard ioctls to configure network devices. They
can be used on any socket's file descriptor regardless of the family
or type. They pass an ifreq structure:
struct ifreq {
char ifr_name[IFNAMSIZ];/* Interface name */
..
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==========
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