Title: IIS / Site Server Multithread SSL Vulnerability
Severity: MODERATE
Description:
The SSL ISAPI filter that ships with IIS 4 is vulnerable to an error that could allow sensitive, normally encrypted information to be transmitted in plaintext to the client. The error is in the way that the filter handles simultaneous threads. Under heavy load conditions, a multi-threaded client application could cause the server to transmit one buffer of data unencrypted and then to terminate the connection.
While the data is sent only to the client machine, the risk is that an attacker sniffing the connection could also receive the plaintext content.
Affected Products:
- Cisco Building Broadband Service Manager 5.0.0
- Cisco Call Manager 1.0.0
- Cisco Call Manager 2.0.0
- Cisco Call Manager 3.0.0
- Cisco ICS 7750 0.0.0
- Cisco IP/VC 3540 Video Rate Matching Module 0.0.0
- Cisco Unity Server 2.0.0
- Cisco Unity Server 2.2.0
- Cisco Unity Server 2.3.0
- Cisco Unity Server 2.4.0
- Cisco uOne 1.0.0
- Cisco uOne 2.0.0
- Cisco uOne 3.0.0
- Cisco uOne 4.0.0
- Microsoft BackOffice 4.0.0
- Microsoft BackOffice 4.5.0
- Microsoft IIS 4.0.0
- Microsoft Site Server Commerce Edition 3.0.0 alpha
- Microsoft Site Server Commerce Edition 3.0.0 i386
- Microsoft Windows NT 4.0 Option Pack
References:
- Microsoft: Microsoft Security Bulletin MS99-053: Frequently Asked Questions
- Microsoft: Q244613: IIS 4.0 SSL ISAPI Filter Can Leak Single Buffer of Plaintext
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