Microsoft IIS 4.0/5.0 ASP Session Cookie improper authentication

CVSS Meta Temp Score
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CTI Interest Score
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7.0$0-$5k0.00

Summaryinfo

A vulnerability marked as critical has been reported in Microsoft IIS 4.0/5.0. Affected by this vulnerability is an unknown functionality of the component ASP Session Handler. The manipulation leads to improper authentication (Cookie). This vulnerability is documented as CVE-2000-0970. There is not any exploit available. Applying a patch is the recommended action to fix this issue.

Detailsinfo

A vulnerability was found in Microsoft IIS 4.0/5.0 (Web Server). It has been rated as critical. This issue affects an unknown code of the component ASP Session Handler. The manipulation with an unknown input leads to a improper authentication vulnerability (Cookie). Using CWE to declare the problem leads to CWE-287. When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

IIS 4.0 and 5.0 .ASP pages send the same Session ID cookie for secure and insecure web sessions, which could allow remote attackers to hijack the secure web session of the user if that user moves to an insecure session, aka the "Session ID Cookie Marking" vulnerability.

The weakness was released 10/23/2000 by Ron Sires and C. Conrad Cady with ACROS Security as confirmed advisory (Website). The advisory is shared at acrossecurity.com. The identification of this vulnerability is CVE-2000-0970. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Neither technical details nor an exploit are publicly available.

The commercial vulnerability scanner Qualys is able to test this issue with plugin 86099 (Microsoft IIS 4.0/5.0 Session ID Cookie Marking vulnerability).

Applying the patch MS00-080 is able to eliminate this problem. The bugfix is ready for download at technet.microsoft.com.

The vulnerability is also documented in the databases at X-Force (5396), SecurityFocus (BID 1832†), OSVDB (7265†) and Vulnerability Center (SBV-3056†). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Type

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.3
VulDB Meta Temp Score: 7.0

VulDB Base Score: 7.3
VulDB Temp Score: 7.0
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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💳💳💳💳💳💳
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Name: Cookie
Class: Improper authentication / Cookie
CWE: CWE-287
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Patch
Status: 🔍

0-Day Time: 🔍

Patch: MS00-080

Timelineinfo

10/23/2000 🔍
10/23/2000 +0 days 🔍
12/19/2000 +57 days 🔍
12/19/2000 +0 days 🔍
12/01/2003 +1077 days 🔍
04/09/2004 +129 days 🔍
07/01/2014 +3735 days 🔍
10/12/2025 +4120 days 🔍

Sourcesinfo

Vendor: microsoft.com

Advisory: acrossecurity.com
Researcher: Ron Sires, C. Conrad Cady
Organization: ACROS Security
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2000-0970 (🔍)
GCVE (CVE): GCVE-0-2000-0970
GCVE (VulDB): GCVE-100-16181
X-Force: 5396 - Web servers allows attacker to remotely retrieve session ID cookies
SecurityFocus: 1832 - Microsoft IIS 4.0/5.0 Session ID Cookie Disclosure Vulnerability
OSVDB: 7265 - IIS .ASP Session ID Disclosure and Hijacking
Vulnerability Center: 3056 - [MS00-080] IIS 4.0 and 5.0 Allow Session ID Hijacking, High

Entryinfo

Created: 07/02/2014 00:47
Updated: 10/12/2025 01:24
Changes: 07/02/2014 00:47 (61), 08/24/2017 09:10 (10), 10/12/2025 01:24 (18)
Complete: 🔍
Cache ID: 216::103

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