Title: Microsoft IIS HTR Chunked Encoding Transfer Heap Overflow Vulnerability
Severity: CRITICAL
Description:
A heap overflow condition in the 'chunked encoding transfer mechanism' related to the ISAPI HTR extension has been discovered in Microsoft IIS (Internet Information Services).
This condition is due to a unchecked buffer, which is dynamically allocated by the ISAPI extension that implements HTR. HTR scripting has largely been abandoned in favor of ASP (Active Server Pages). This vulnerability is only a problem on systems which have the HTR ISAPI filter enabled.
This vulnerability affects IIS 4.0 and IIS 5.0. Exploitation of this vulnerability may result in a denial of service or allow for a remote attacker to execute arbitrary instructions on the victim host. An attacker can possibly initiate a malicious session which is capable of overwriting static global variables, stored function pointers, process management structures, memory management structures, and other data types with attacker-supplied instructions.
On IIS 4.0, arbitrary code execution may result in a full compromise. On IIS 5.0, this issue may allow an attacker to gain fewer yet still significant privileges.
Upon the release of Microsoft Security Bulletin MS02-018, an alert for this issue went out as Bugtraq ID 5003, as it was believed to be a seperate issue. The original discoverer (NGSSoftware) of this issue has confirmed that the two issues are the same. Riley Hassell of eEye Digital Security also discovered this issue independently from NGSSoftware.
** Microsoft has updated MS02-028 to correct the procedure for verifying the patch has been correctly installed under IIS 5.0.
Affected Products:
- Avaya DefinityOne Media Servers
- Avaya IP600 Media Servers
- Avaya S3400 Message Application Server
- Avaya S8100 Media Servers
- Microsoft Windows 2000 Advanced Server
- Microsoft Windows 2000 Advanced Server SP1
- Microsoft Windows 2000 Advanced Server SP2
- Microsoft Windows 2000 Datacenter Server
- Microsoft Windows 2000 Datacenter Server SP1
- Microsoft Windows 2000 Datacenter Server SP2
- Microsoft Windows 2000 Professional
- Microsoft Windows 2000 Professional SP1
- Microsoft Windows 2000 Professional SP2
- Microsoft Windows 2000 Server
- Microsoft Windows 2000 Server SP1
- Microsoft Windows 2000 Server SP2
- Microsoft Windows NT Enterprise Server 4.0
- Microsoft Windows NT Enterprise Server 4.0 SP1
- Microsoft Windows NT Enterprise Server 4.0 SP2
- Microsoft Windows NT Enterprise Server 4.0 SP3
- Microsoft Windows NT Enterprise Server 4.0 SP4
- Microsoft Windows NT Enterprise Server 4.0 SP5
- Microsoft Windows NT Enterprise Server 4.0 SP6
- Microsoft Windows NT Enterprise Server 4.0 SP6a
- Microsoft Windows NT Server 4.0
- Microsoft Windows NT Server 4.0 SP1
- Microsoft Windows NT Server 4.0 SP2
- Microsoft Windows NT Server 4.0 SP3
- Microsoft Windows NT Server 4.0 SP4
- Microsoft Windows NT Server 4.0 SP5
- Microsoft Windows NT Server 4.0 SP6
- Microsoft Windows NT Server 4.0 SP6a
- Microsoft Windows NT Terminal Server 4.0
- Microsoft Windows NT Terminal Server 4.0 SP1
- Microsoft Windows NT Terminal Server 4.0 SP2
- Microsoft Windows NT Terminal Server 4.0 SP3
- Microsoft Windows NT Terminal Server 4.0 SP4
- Microsoft Windows NT Terminal Server 4.0 SP5
- Microsoft Windows NT Terminal Server 4.0 SP6
- Microsoft Windows NT Workstation 4.0
- Microsoft Windows NT Workstation 4.0 SP1
- Microsoft Windows NT Workstation 4.0 SP2
- Microsoft Windows NT Workstation 4.0 SP3
- Microsoft Windows NT Workstation 4.0 SP4
- Microsoft Windows NT Workstation 4.0 SP5
- Microsoft Windows NT Workstation 4.0 SP6
- Microsoft Windows NT Workstation 4.0 SP6a
References:
- CORE Security: IIS HTR ChunkedEncoding exploit
- Microsoft: Microsoft Security Bulletin MS02-028
- Microsoft: Technet Security
- Next Generation Security Software: Internet Information Server
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