Apache 2.0 Encoded Backslash Directory Traversal Vulnerability

BID:5434

Info

Apache 2.0 Encoded Backslash Directory Traversal Vulnerability

Bugtraq ID: 5434
Class: Input Validation Error
CVE: CVE-2002-0661
Remote: Yes
Local: No
Published: Aug 09 2002 12:00AM
Updated: Jul 11 2009 02:56PM
Credit: This issue was announced by the Apache Software Foundation. Discovery of this issue is credited to Auriemma Luigi <[email protected]>.
Vulnerable: Apache Apache 2.0.39
Apache Apache 2.0.38
Apache Apache 2.0.37
Apache Apache 2.0.36
Apache Apache 2.0.35
Apache Apache 2.0.34 -BETA
- Microsoft Windows 2000 Advanced Server SP2
 - Microsoft Windows 2000 Advanced Server SP2
 - Microsoft Windows 2000 Advanced Server SP1
 - Microsoft Windows 2000 Advanced Server SP1
 - Microsoft Windows 2000 Advanced Server
- Microsoft Windows 2000 Advanced Server
- Microsoft Windows 2000 Datacenter Server SP2
 - Microsoft Windows 2000 Datacenter Server SP2
 - Microsoft Windows 2000 Datacenter Server SP1
 - Microsoft Windows 2000 Datacenter Server SP1
 - Microsoft Windows 2000 Datacenter Server
- Microsoft Windows 2000 Datacenter Server
- Microsoft Windows 2000 Professional SP2
 - Microsoft Windows 2000 Professional SP2
 - Microsoft Windows 2000 Professional SP1
 - Microsoft Windows 2000 Professional SP1
 - Microsoft Windows 2000 Professional
- Microsoft Windows 2000 Professional
- Microsoft Windows 2000 Server SP2
 - Microsoft Windows 2000 Server SP2
 - Microsoft Windows 2000 Server SP1
 - Microsoft Windows 2000 Server SP1
 - Microsoft Windows 2000 Server
- Microsoft Windows 2000 Server
- Microsoft Windows 95
- Microsoft Windows 98
- Microsoft Windows NT Enterprise Server 4.0 SP6a
 - Microsoft Windows NT Enterprise Server 4.0 SP6a
 - Microsoft Windows NT Enterprise Server 4.0 SP6
 - Microsoft Windows NT Enterprise Server 4.0 SP6
 - Microsoft Windows NT Enterprise Server 4.0 SP5
 - Microsoft Windows NT Enterprise Server 4.0 SP5
 - Microsoft Windows NT Enterprise Server 4.0 SP4
 - Microsoft Windows NT Enterprise Server 4.0 SP4
 - Microsoft Windows NT Enterprise Server 4.0 SP3
 - Microsoft Windows NT Enterprise Server 4.0 SP3
 - Microsoft Windows NT Enterprise Server 4.0 SP2
 - Microsoft Windows NT Enterprise Server 4.0 SP2
 - Microsoft Windows NT Enterprise Server 4.0 SP1
 - Microsoft Windows NT Enterprise Server 4.0 SP1
 - Microsoft Windows NT Enterprise Server 4.0
 - Microsoft Windows NT Enterprise Server 4.0
 - Microsoft Windows NT Server 4.0 SP6a
 - Microsoft Windows NT Server 4.0 SP6a
 - Microsoft Windows NT Server 4.0 SP6
 - Microsoft Windows NT Server 4.0 SP6
 - Microsoft Windows NT Server 4.0 SP5
 - Microsoft Windows NT Server 4.0 SP5
 - Microsoft Windows NT Server 4.0 SP4
 - Microsoft Windows NT Server 4.0 SP4
 - Microsoft Windows NT Server 4.0 SP3
 - Microsoft Windows NT Server 4.0 SP3
 - Microsoft Windows NT Server 4.0 SP2
 - Microsoft Windows NT Server 4.0 SP2
 - Microsoft Windows NT Server 4.0 SP1
 - Microsoft Windows NT Server 4.0 SP1
 - Microsoft Windows NT Server 4.0
 - Microsoft Windows NT Server 4.0
 - Microsoft Windows NT Terminal Server 4.0 SP6a
 - Microsoft Windows NT Terminal Server 4.0 SP6
 - Microsoft Windows NT Terminal Server 4.0 SP6
 - Microsoft Windows NT Terminal Server 4.0 SP5
 - Microsoft Windows NT Terminal Server 4.0 SP5
 - Microsoft Windows NT Terminal Server 4.0 SP4
 - Microsoft Windows NT Terminal Server 4.0 SP4
 - Microsoft Windows NT Terminal Server 4.0 SP3
 - Microsoft Windows NT Terminal Server 4.0 SP3
 - Microsoft Windows NT Terminal Server 4.0 SP2
 - Microsoft Windows NT Terminal Server 4.0 SP2
 - Microsoft Windows NT Terminal Server 4.0 SP1
 - Microsoft Windows NT Terminal Server 4.0 SP1
 - Microsoft Windows NT Terminal Server 4.0
 - Microsoft Windows NT Terminal Server 4.0
 - Microsoft Windows NT Workstation 4.0 SP6a
 - Microsoft Windows NT Workstation 4.0 SP6
 - Microsoft Windows NT Workstation 4.0 SP6
 - Microsoft Windows NT Workstation 4.0 SP5
 - Microsoft Windows NT Workstation 4.0 SP5
 - Microsoft Windows NT Workstation 4.0 SP4
 - Microsoft Windows NT Workstation 4.0 SP4
 - Microsoft Windows NT Workstation 4.0 SP3
 - Microsoft Windows NT Workstation 4.0 SP3
 - Microsoft Windows NT Workstation 4.0 SP2
 - Microsoft Windows NT Workstation 4.0 SP2
 - Microsoft Windows NT Workstation 4.0 SP1
 - Microsoft Windows NT Workstation 4.0 SP1
 - Microsoft Windows NT Workstation 4.0
 - Microsoft Windows NT Workstation 4.0
 - Microsoft Windows XP Home
- Microsoft Windows XP Home
- Microsoft Windows XP Professional
- Microsoft Windows XP Professional
Apache Apache 2.0.32 -BETA
- Microsoft Windows 2000 Datacenter Server SP2
 - Microsoft Windows 2000 Datacenter Server SP2
 - Microsoft Windows 2000 Datacenter Server SP1
 - Microsoft Windows 2000 Datacenter Server SP1
 - Microsoft Windows 2000 Datacenter Server
- Microsoft Windows 2000 Datacenter Server
- Microsoft Windows 2000 Professional SP2
 - Microsoft Windows 2000 Professional SP2
 - Microsoft Windows 2000 Professional SP1
 - Microsoft Windows 2000 Professional SP1
 - Microsoft Windows 2000 Professional
- Microsoft Windows 2000 Professional
- Microsoft Windows 2000 Server SP2
 - Microsoft Windows 2000 Server SP2
 - Microsoft Windows 2000 Server SP1
 - Microsoft Windows 2000 Server SP1
 - Microsoft Windows 2000 Server
- Microsoft Windows 2000 Server
- Microsoft Windows 95
- Microsoft Windows 98
- Microsoft Windows NT Enterprise Server 4.0 SP6a
 - Microsoft Windows NT Enterprise Server 4.0 SP6a
 - Microsoft Windows NT Enterprise Server 4.0 SP6
 - Microsoft Windows NT Enterprise Server 4.0 SP6
 - Microsoft Windows NT Enterprise Server 4.0 SP5
 - Microsoft Windows NT Enterprise Server 4.0 SP5
 - Microsoft Windows NT Enterprise Server 4.0 SP4
 - Microsoft Windows NT Enterprise Server 4.0 SP4
 - Microsoft Windows NT Enterprise Server 4.0 SP3
 - Microsoft Windows NT Enterprise Server 4.0 SP3
 - Microsoft Windows NT Enterprise Server 4.0 SP2
 - Microsoft Windows NT Enterprise Server 4.0 SP2
 - Microsoft Windows NT Enterprise Server 4.0 SP1
 - Microsoft Windows NT Enterprise Server 4.0 SP1
 - Microsoft Windows NT Enterprise Server 4.0
 - Microsoft Windows NT Enterprise Server 4.0
 - Microsoft Windows NT Server 4.0 SP6a
 - Microsoft Windows NT Server 4.0 SP6a
 - Microsoft Windows NT Server 4.0 SP6
 - Microsoft Windows NT Server 4.0 SP6
 - Microsoft Windows NT Server 4.0 SP5
 - Microsoft Windows NT Server 4.0 SP5
 - Microsoft Windows NT Server 4.0 SP4
 - Microsoft Windows NT Server 4.0 SP4
 - Microsoft Windows NT Server 4.0 SP3
 - Microsoft Windows NT Server 4.0 SP3
 - Microsoft Windows NT Server 4.0 SP2
 - Microsoft Windows NT Server 4.0 SP2
 - Microsoft Windows NT Server 4.0 SP1
 - Microsoft Windows NT Server 4.0 SP1
 - Microsoft Windows NT Server 4.0
 - Microsoft Windows NT Server 4.0
 - Microsoft Windows NT Terminal Server 4.0 SP6a
 - Microsoft Windows NT Terminal Server 4.0 SP6
 - Microsoft Windows NT Terminal Server 4.0 SP6
 - Microsoft Windows NT Terminal Server 4.0 SP5
 - Microsoft Windows NT Terminal Server 4.0 SP5
 - Microsoft Windows NT Terminal Server 4.0 SP4
 - Microsoft Windows NT Terminal Server 4.0 SP4
 - Microsoft Windows NT Terminal Server 4.0 SP3
 - Microsoft Windows NT Terminal Server 4.0 SP3
 - Microsoft Windows NT Terminal Server 4.0 SP2
 - Microsoft Windows NT Terminal Server 4.0 SP2
 - Microsoft Windows NT Terminal Server 4.0 SP1
 - Microsoft Windows NT Terminal Server 4.0 SP1
 - Microsoft Windows NT Terminal Server 4.0
 - Microsoft Windows NT Terminal Server 4.0
 - Microsoft Windows NT Workstation 4.0 SP6a
 - Microsoft Windows NT Workstation 4.0 SP6
 - Microsoft Windows NT Workstation 4.0 SP6
 - Microsoft Windows NT Workstation 4.0 SP5
 - Microsoft Windows NT Workstation 4.0 SP5
 - Microsoft Windows NT Workstation 4.0 SP4
 - Microsoft Windows NT Workstation 4.0 SP4
 - Microsoft Windows NT Workstation 4.0 SP3
 - Microsoft Windows NT Workstation 4.0 SP3
 - Microsoft Windows NT Workstation 4.0 SP2
 - Microsoft Windows NT Workstation 4.0 SP2
 - Microsoft Windows NT Workstation 4.0 SP1
 - Microsoft Windows NT Workstation 4.0 SP1
 - Microsoft Windows NT Workstation 4.0
 - Microsoft Windows NT Workstation 4.0
 - Microsoft Windows XP Home
- Microsoft Windows XP Home
- Microsoft Windows XP Professional
- Microsoft Windows XP Professional
Apache Apache 2.0.32
Apache Apache 2.0.28 -BETA
- Microsoft Windows 2000 Advanced Server SP2
 - Microsoft Windows 2000 Advanced Server SP2
 - Microsoft Windows 2000 Advanced Server SP1
 - Microsoft Windows 2000 Advanced Server SP1
 - Microsoft Windows 2000 Advanced Server
- Microsoft Windows 2000 Advanced Server
- Microsoft Windows 2000 Datacenter Server SP2
 - Microsoft Windows 2000 Datacenter Server SP2
 - Microsoft Windows 2000 Datacenter Server SP1
 - Microsoft Windows 2000 Datacenter Server SP1
 - Microsoft Windows 2000 Datacenter Server
- Microsoft Windows 2000 Datacenter Server
- Microsoft Windows 2000 Professional SP2
 - Microsoft Windows 2000 Professional SP2
 - Microsoft Windows 2000 Professional SP1
 - Microsoft Windows 2000 Professional SP1
 - Microsoft Windows 2000 Professional
- Microsoft Windows 2000 Professional
- Microsoft Windows 2000 Server SP2
 - Microsoft Windows 2000 Server SP2
 - Microsoft Windows 2000 Server SP1
 - Microsoft Windows 2000 Server SP1
 - Microsoft Windows 2000 Server
- Microsoft Windows 2000 Server
- Microsoft Windows 95
- Microsoft Windows 98
- Microsoft Windows NT Enterprise Server 4.0 SP6a
 - Microsoft Windows NT Enterprise Server 4.0 SP6a
 - Microsoft Windows NT Enterprise Server 4.0 SP6
 - Microsoft Windows NT Enterprise Server 4.0 SP6
 - Microsoft Windows NT Enterprise Server 4.0 SP5
 - Microsoft Windows NT Enterprise Server 4.0 SP5
 - Microsoft Windows NT Enterprise Server 4.0 SP4
 - Microsoft Windows NT Enterprise Server 4.0 SP4
 - Microsoft Windows NT Enterprise Server 4.0 SP3
 - Microsoft Windows NT Enterprise Server 4.0 SP3
 - Microsoft Windows NT Enterprise Server 4.0 SP2
 - Microsoft Windows NT Enterprise Server 4.0 SP2
 - Microsoft Windows NT Enterprise Server 4.0 SP1
 - Microsoft Windows NT Enterprise Server 4.0 SP1
 - Microsoft Windows NT Enterprise Server 4.0
 - Microsoft Windows NT Enterprise Server 4.0
 - Microsoft Windows NT Server 4.0 SP6a
 - Microsoft Windows NT Server 4.0 SP6a
 - Microsoft Windows NT Server 4.0 SP6
 - Microsoft Windows NT Server 4.0 SP6
 - Microsoft Windows NT Server 4.0 SP5
 - Microsoft Windows NT Server 4.0 SP5
 - Microsoft Windows NT Server 4.0 SP4
 - Microsoft Windows NT Server 4.0 SP4
 - Microsoft Windows NT Server 4.0 SP3
 - Microsoft Windows NT Server 4.0 SP3
 - Microsoft Windows NT Server 4.0 SP2
 - Microsoft Windows NT Server 4.0 SP2
 - Microsoft Windows NT Server 4.0 SP1
 - Microsoft Windows NT Server 4.0 SP1
 - Microsoft Windows NT Server 4.0
 - Microsoft Windows NT Server 4.0
 - Microsoft Windows NT Terminal Server 4.0 SP6a
 - Microsoft Windows NT Terminal Server 4.0 SP6
 - Microsoft Windows NT Terminal Server 4.0 SP6
 - Microsoft Windows NT Terminal Server 4.0 SP5
 - Microsoft Windows NT Terminal Server 4.0 SP5
 - Microsoft Windows NT Terminal Server 4.0 SP4
 - Microsoft Windows NT Terminal Server 4.0 SP4
 - Microsoft Windows NT Terminal Server 4.0 SP3
 - Microsoft Windows NT Terminal Server 4.0 SP3
 - Microsoft Windows NT Terminal Server 4.0 SP2
 - Microsoft Windows NT Terminal Server 4.0 SP2
 - Microsoft Windows NT Terminal Server 4.0 SP1
 - Microsoft Windows NT Terminal Server 4.0 SP1
 - Microsoft Windows NT Terminal Server 4.0
 - Microsoft Windows NT Terminal Server 4.0
 - Microsoft Windows NT Workstation 4.0 SP6a
 - Microsoft Windows NT Workstation 4.0 SP6
 - Microsoft Windows NT Workstation 4.0 SP6
 - Microsoft Windows NT Workstation 4.0 SP5
 - Microsoft Windows NT Workstation 4.0 SP5
 - Microsoft Windows NT Workstation 4.0 SP4
 - Microsoft Windows NT Workstation 4.0 SP4
 - Microsoft Windows NT Workstation 4.0 SP3
 - Microsoft Windows NT Workstation 4.0 SP3
 - Microsoft Windows NT Workstation 4.0 SP2
 - Microsoft Windows NT Workstation 4.0 SP2
 - Microsoft Windows NT Workstation 4.0 SP1
 - Microsoft Windows NT Workstation 4.0 SP1
 - Microsoft Windows NT Workstation 4.0
 - Microsoft Windows NT Workstation 4.0
 - Microsoft Windows XP Home
- Microsoft Windows XP Home
- Microsoft Windows XP Professional
- Microsoft Windows XP Professional
Apache Apache 2.0.28 Beta
Apache Apache 2.0.28
Apache Apache 2.0
Not Vulnerable: Apache Apache 2.0.40
+ Redhat Linux 9.0 i386
 + Redhat Linux 8.0
+ Terra Soft Solutions Yellow Dog Linux 3.0

Discussion

Apache 2.0 Encoded Backslash Directory Traversal Vulnerability

A directory traversal vulnerability exists in Apache versions 2.0.39 and earlier on non-Unix platforms (potentially including Apache compiled with CYGWIN). Platforms that may be affected by this include Windows, OS2, and Netware.

The issue is related to the failure to properly process the backslash '\' character, which may be used as a directory delimiter under these platforms. By using the URL encoded sequence '%2e%2e%5c', the web root may be escaped.

Exploitation may result in the disclosure of sensitive information. Additionally, arbitrary local programs may be executed with attacker supplied parameters if directory traversal techniques are used to escape the cgi-bin directory.

Exploit / POC

Apache 2.0 Encoded Backslash Directory Traversal Vulnerability

No exploit is required. The following sample requests have been provided by Auriemma Luigi &lt;[email protected]&gt;:

http://127.0.0.1/error/%5c%2e%2e%5c%2e%2e%5c%2e%2e%5c%2e%2e%5cwinnt%5cwin.ini
http://127.0.0.1/cgi-bin/%5c%2e%2e%5cbin%5cwintty.exe?%2dt+HELLO

Solution / Fix

Apache 2.0 Encoded Backslash Directory Traversal Vulnerability

Solution:
This issue is resolved in Apache 2.0.40:


Apache Apache 2.0.28 -BETA

Apache Apache 2.0.28 Beta

Apache Apache 2.0.28

Apache Apache 2.0.32

Apache Apache 2.0.32 -BETA

Apache Apache 2.0.34 -BETA

Apache Apache 2.0.35

Apache Apache 2.0.36

Apache Apache 2.0.37

Apache Apache 2.0.38

Apache Apache 2.0.39

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