GHSA-ffq8-576r-v26g
Suggest an improvement- Source
- https://github.com/advisories/GHSA-ffq8-576r-v26g
- Import Source
- https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2019/07/GHSA-ffq8-576r-v26g/GHSA-ffq8-576r-v26g.json
- JSON Data
- https://api.osv.dev/v1/vulns/GHSA-ffq8-576r-v26g
- Aliases
- Published
- 2019-07-05T21:11:05Z
- Modified
- 2024-11-30T05:39:01.605415Z
- Severity
-
- 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
- 8.7 (High) CVSS_V4 - 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 CVSS Calculator
- Summary
- HPACK Denial of Service vulnerability (HPACK Bomb)
- Details
-
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.
- Database specific
{ "nvd_published_at": null, "cwe_ids": [], "severity": "HIGH", "github_reviewed": true, "github_reviewed_at": "2020-06-16T21:34:33Z" }- References
-
- https://nvd.nist.gov/vuln/detail/CVE-2016-6581
- https://github.com/advisories/GHSA-ffq8-576r-v26g
- https://github.com/pypa/advisory-database/tree/main/vulns/hpack/PYSEC-2017-87.yaml
- https://github.com/python-hyper/hpack
- https://python-hyper.org/hpack/en/latest/security/CVE-2016-6581.html
- https://web.archive.org/web/20200227233559/http://www.securityfocus.com/bid/92315
- http://python-hyper.org/projects/hpack/en/stable/security/CVE-2016-6581.html
Affected packages
PyPI / hpack
Package
- Name
- hpack
- View open source insights on deps.dev
- Purl
- pkg:pypi/hpack