PT-2017-4103 · Python · Python Priority Library

Published 2017-01-10 · Updated 2022-05-17 · CVE-2016-6580

Positive Technologies (AI Summary)

CVSS v2.0

7.8

High

Base vector

AV:N/AC:L/Au:N/C:N/I:N/A:C

Name of the Vulnerable Software and Affected Versions python priority library versions prior to 1.2.0

Description The issue is related to a resource management error in the python priority library. A malicious peer can exploit this by assigning priority information for every possible HTTP/2 stream ID, causing the priority tree to allocate unbounded amounts of memory. This can lead to extremely high CPU usage and potentially result in a denial of service.

Recommendations For versions prior to 1.2.0, update to version 1.2.0 or later to resolve the issue. As a temporary workaround, consider restricting the ability of peers to assign priority information for HTTP/2 stream IDs to minimize the risk of exploitation.

Fix

Allocation of Resources Without Limits

Weakness Enumeration

CWE-399

CWE-770

Related Identifiers

BDU:2021-03083

CVE-2016-6580

GHSA-H3Q4-6J7F-R24C

PYSEC-2017-93

Affected Products

Python Priority Library

References · 16

• https://osv.dev/vulnerability/PYSEC-2017-93 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2016-6580 · Security Note
• https://osv.dev/vulnerability/CVE-2016-6580 · Vendor Advisory
• https://python-hyper.org/priority/en/latest/security/CVE-2016-6580.html · Vendor Advisory
• https://bdu.fstec.ru/vul/2021-03083 · Security Note
• https://osv.dev/vulnerability/GHSA-h3q4-6j7f-r24c · Vendor Advisory
• https://github.com/pypa/advisory-database/tree/main/vulns/priority/PYSEC-2017-93.yaml · Note
• https://github.com/python-hyper/priority/pull/23 · Note
• https://github.com/python-hyper/priority · Note
• https://github.com/python-hyper/priority/commit/7d01a7dc4db83bce50f20d47caf4f37b403a3ecd · Note
• https://securityfocus.com/bid/92311 · Note
• http://securityfocus.com/bid/92311 · Note
• https://vuldb.com/es/?id.95119 · Note
• https://kb.juniper.net/InfoCenter/index?page=content&id=JSA11176&cat=SIRT_1&actp=LIST&showDraft=false · Note
• https://web.archive.org/web/20160806004329/http://securityfocus.com/bid/92311 · Note