A HTTP/2 implementation built using any version of the Python HPACK library between v1.0.0 and v2.2.0 could be targeted for a denial of service attack, specifically a so-called "HPACK Bomb" attack. This attack occurs when an attacker inserts a header field that is exactly the size of the HPACK dynamic header table into the dynamic header table. The attacker can then send a header block that is simply repeated requests to expand that field in the dynamic table. This can lead to a gigantic compression ratio of 4,096 or better, meaning that 16kB of data can decompress to 64MB of data on the target machine.
References
| Link | Resource |
|---|---|
| http://www.securityfocus.com/bid/92315 | Third Party Advisory VDB Entry |
| https://python-hyper.org/hpack/en/latest/security/CVE-2016-6581.html | Mitigation Vendor Advisory |
| http://www.securityfocus.com/bid/92315 | Third Party Advisory VDB Entry |
| https://python-hyper.org/hpack/en/latest/security/CVE-2016-6581.html | Mitigation Vendor Advisory |
Configurations
Configuration 1 (hide)
|
History
21 Nov 2024, 02:56
| Type | Values Removed | Values Added |
|---|---|---|
| References | () http://www.securityfocus.com/bid/92315 - Third Party Advisory, VDB Entry | |
| References | () https://python-hyper.org/hpack/en/latest/security/CVE-2016-6581.html - Mitigation, Vendor Advisory |
Information
Published : 2017-01-10 15:59
Updated : 2024-11-21 02:56
NVD link : CVE-2016-6581
Mitre link : CVE-2016-6581
CVE.ORG link : CVE-2016-6581
JSON object : View
Products Affected
python
- hpack
- hyper
CWE
CWE-399
Resource Management Errors