CVE-2016-6581 – hpack

Package

Manager: pip
Name: hpack
Vulnerable Version: >=1.0.0 <2.3.0

Severity

Level: High

CVSS v3.1: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

EPSS: 0.00373 pctl0.58185

Details

HPACK Denial of Service vulnerability (HPACK Bomb) 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.

Metadata

Created: 2019-07-05T21:11:05Z
Modified: 2024-09-20T21:39:26Z
Source: https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2019/07/GHSA-ffq8-576r-v26g/GHSA-ffq8-576r-v26g.json
CWE IDs: []
Alternative ID: GHSA-ffq8-576r-v26g
Finding: F002
Auto approve: 1