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CVE-2016-6581
Detail
Description
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.
NVD Analysts use publicly available information to associate vector strings and CVSS scores. We also display any CVSS information provided within the CVE List from the CNA.
Note: NVD Analysts have published a CVSS score for this CVE based on publicly available information at the time of analysis. The CNA has not provided a score within the CVE List.
NVD Analysts use publicly available information to associate vector strings and CVSS scores. We also display any CVSS information provided within the CVE List from the CNA.
Note: NVD Analysts have published a CVSS score for this CVE based on publicly available information at the time of analysis. The CNA has not provided a score within the CVE List.
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A HTTP/2 implementation built using any version of the Python HPACK library between v1.0.0 and v2.2.0 could be targetted 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 compre
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 compres
Initial Analysis by NIST1/10/2017 11:16:34 PM
Action
Type
Old Value
New Value
Added
CPE Configuration
OR
*cpe:2.3:a:python_software_foundation:hpack:1.0:*:*:*:*:*:*:*
*cpe:2.3:a:python_software_foundation:hpack:2.0:*:*:*:*:*:*:*
*cpe:2.3:a:python_software_foundation:hpack:2.0.1:*:*:*:*:*:*:*
*cpe:2.3:a:python_software_foundation:hpack:2.1.1:*:*:*:*:*:*:*
*cpe:2.3:a:python_software_foundation:hpack:2.2:*:*:*:*:*:*:*
*cpe:2.3:a:python_software_foundation:hyper:0.4:*:*:*:*:*:*:*
*cpe:2.3:a:python_software_foundation:hyper:0.6:*:*:*:*:*:*:*
Added
CVSS V2
(AV:N/AC:L/Au:N/C:N/I:N/A:C)
Added
CVSS V3
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Added
CWE
CWE-399
Changed
Reference Type
http://www.securityfocus.com/bid/92315 No Types Assigned
http://www.securityfocus.com/bid/92315 Third Party Advisory, VDB Entry
Changed
Reference Type
https://python-hyper.org/hpack/en/latest/security/CVE-2016-6581.html No Types Assigned