ghsa-ffq8-576r-v26g
Vulnerability from github
Published
2019-07-05 21:11
Modified
2024-09-20 21:39
Severity ?
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
8.7 (High) - 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
8.7 (High) - 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
VLAI Severity ?
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.
{ "affected": [ { "package": { "ecosystem": "PyPI", "name": "hpack" }, "ranges": [ { "events": [ { "introduced": "1.0.0" }, { "fixed": "2.3.0" } ], "type": "ECOSYSTEM" } ] } ], "aliases": [ "CVE-2016-6581" ], "database_specific": { "cwe_ids": [], "github_reviewed": true, "github_reviewed_at": "2020-06-16T21:34:33Z", "nvd_published_at": null, "severity": "HIGH" }, "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.", "id": "GHSA-ffq8-576r-v26g", "modified": "2024-09-20T21:39:26Z", "published": "2019-07-05T21:11:05Z", "references": [ { "type": "ADVISORY", "url": "https://nvd.nist.gov/vuln/detail/CVE-2016-6581" }, { "type": "ADVISORY", "url": "https://github.com/advisories/GHSA-ffq8-576r-v26g" }, { "type": "WEB", "url": "https://github.com/pypa/advisory-database/tree/main/vulns/hpack/PYSEC-2017-87.yaml" }, { "type": "PACKAGE", "url": "https://github.com/python-hyper/hpack" }, { "type": "WEB", "url": "https://python-hyper.org/hpack/en/latest/security/CVE-2016-6581.html" }, { "type": "WEB", "url": "https://web.archive.org/web/20200227233559/http://www.securityfocus.com/bid/92315" }, { "type": "WEB", "url": "http://python-hyper.org/projects/hpack/en/stable/security/CVE-2016-6581.html" } ], "schema_version": "1.4.0", "severity": [ { "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "type": "CVSS_V3" }, { "score": "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", "type": "CVSS_V4" } ], "summary": "HPACK Denial of Service vulnerability (HPACK Bomb)" }
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Sightings
Author | Source | Type | Date |
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Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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