Microsoft IIS 4.0/5.0 Chunked Encoding Transfer memory corruption

CVSS Meta Temp Score
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CTI Interest Score
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6.6$0-$5k0.00

Summaryinfo

A vulnerability described as critical has been identified in Microsoft IIS 4.0/5.0. Affected is an unknown function of the component Chunked Encoding Transfer Handler. The manipulation results in memory corruption. This vulnerability is reported as CVE-2002-0079. Moreover, an exploit is present. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability classified as critical has been found in Microsoft IIS 4.0/5.0 (Web Server). Affected is an unknown code block of the component Chunked Encoding Transfer Handler. The manipulation with an unknown input leads to a memory corruption vulnerability. CWE is classifying the issue as CWE-119. The product performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

Buffer overflow in the chunked encoding transfer mechanism in Internet Information Server (IIS) 4.0 and 5.0 Active Server Pages allows attackers to cause a denial of service or execute arbitrary code.

The weakness was disclosed 04/22/2002 by eEye Digital Security with eEye Digital Security as confirmed advisory (CERT.org). The advisory is shared for download at kb.cert.org. This vulnerability is traded as CVE-2002-0079. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. Technical details are unknown but a public exploit is available.

A public exploit has been developed in ANSI C. The exploit is shared for download at securityfocus.com. It is declared as proof-of-concept. As 0-day the estimated underground price was around $25k-$100k. The vulnerability scanner Nessus provides a plugin with the ID 10935 (Microsoft IIS ASP ISAPI Filter Multiple Overflows), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Web Servers and running in the context r. The commercial vulnerability scanner Qualys is able to test this issue with plugin 10570 (Microsoft IIS Chunked Encoding Transfer Heap Overflow Vulnerability (MS02-018)).

Upgrading eliminates this vulnerability. Attack attempts may be identified with Snort ID 1618. Furthermore it is possible to detect and prevent this kind of attack with TippingPoint and the filter 1272.

The vulnerability is also documented in the databases at X-Force (8796), Exploit-DB (21368), Tenable (10935), SecurityFocus (BID 4485†) and Vulnerability Center (SBV-1072†). The entries VDB-18073 and VDB-18075 are pretty similar. VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.3
VulDB Meta Temp Score: 6.6

VulDB Base Score: 7.3
VulDB Temp Score: 6.6
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
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NVD Base Score: 🔍

Exploitinginfo

Class: Memory corruption
CWE: CWE-119
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Access: Public
Status: Proof-of-Concept
Programming Language: 🔍
Download: 🔍

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 10935
Nessus Name: Microsoft IIS ASP ISAPI Filter Multiple Overflows
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

Saint ID: exploit_info/iis_chunked_asp
Saint Name: Microsoft IIS ASP chunked encoding buffer overflow

Qualys ID: 🔍
Qualys Name: 🔍

Exploit-DB: 🔍

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍
Snort ID: 1618
Snort Message: SERVER-IIS .asp chunked Transfer-Encoding
Snort Class: 🔍

Suricata ID: 2101809
Suricata Class: 🔍
Suricata Message: 🔍

TippingPoint: 🔍

McAfee IPS: 🔍
McAfee IPS Version: 🔍

SourceFire IPS: 🔍
ISS Proventia IPS: 🔍
PaloAlto IPS: 🔍
Fortigate IPS: 🔍

Timelineinfo

04/09/2002 🔍
04/10/2002 +1 days 🔍
04/10/2002 +0 days 🔍
04/22/2002 +12 days 🔍
04/22/2002 +0 days 🔍
02/25/2003 +309 days 🔍
07/11/2014 +4154 days 🔍
09/23/2025 +4092 days 🔍

Sourcesinfo

Vendor: microsoft.com

Advisory: kb.cert.org
Researcher: eEye Digital Security
Organization: eEye Digital Security
Status: Confirmed

CVE: CVE-2002-0079 (🔍)
GCVE (CVE): GCVE-0-2002-0079
GCVE (VulDB): GCVE-100-18072

OVAL: 🔍

CERT: 🔍
X-Force: 8796
SecurityFocus: 4485 - Microsoft IIS Chunked Encoding Transfer Heap Overflow Vulnerability
Vulnerability Center: 1072 - [MS02-018] Microsoft IIS Chunked Encoding Transfer Heap Overflow Vulnerability, High

scip Labs: https://www.scip.ch/en/?labs.20161013
See also: 🔍

Entryinfo

Created: 07/11/2014 13:51
Updated: 09/23/2025 04:26
Changes: 07/11/2014 13:51 (88), 05/09/2019 17:36 (2), 01/21/2025 07:48 (17), 06/08/2025 09:41 (1), 09/23/2025 04:26 (2)
Complete: 🔍
Cache ID: 216::103

VulDB is the best source for vulnerability data and more expert information about this specific topic.

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