Signature Detail
Short Name |
HTTP:OVERFLOW:INV-CHUNK-LEN |
|---|---|
Severity |
High |
Recommended |
No |
Recommended Action |
Drop |
Category |
HTTP |
Keywords |
sans top20 |
Release Date |
2003/04/22 |
Update Number |
1213 |
Supported Platforms |
di-5.3+, idp-4.0+, isg-3.0+, j-series-9.5+, mx-9.4+, srx-9.2+, srx-branch-9.4+, vsrx-12.1+ |
HTTP: Invalid Chunk Length
This protocol anomaly triggers when an invalid chunk length specification in a chunked transfer encoded HTTP request is detected. RFC-2616#3.6.1 specifies that the size of a chunk should be represented using hexadecimal notation.
Extended Description
A buffer overflow in the HTR ISAPI extension has been reported for Microsoft IIS (Internet Information Services). This condition affects IIS 4.0, IIS 5.0 and may be effectively mitigated by disabling the extension. 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. A number of Cisco products are affected by this vulnerability, although this issue is not present in the Cisco products themselves.
Affected Products
- Cisco Building Broadband Service Manager (BBSM) 4.0.1
- Cisco Building Broadband Service Manager (BBSM) 4.2.0
- Cisco Building Broadband Service Manager (BBSM) 4.3.0
- Cisco Building Broadband Service Manager (BBSM) 4.4.0
- Cisco Building Broadband Service Manager (BBSM) 4.5.0
- Cisco Building Broadband Service Manager (BBSM) 5.0.0
- Cisco Building Broadband Service Manager (BBSM) 5.1.0
- Cisco Call Manager 3.0.0
- Cisco Call Manager 3.1.0
- Cisco Call Manager 3.2.0
- Cisco Unity Server 2.0.0
- Cisco Unity Server 2.1.0
- Cisco Unity Server 2.2.0
- Cisco Unity Server 2.3.0
- Cisco Unity Server 2.4.0
- Microsoft IIS 4.0
- Microsoft IIS 5.0
- Microsoft IIS 5.1
References