Bug 2004108 (CVE-2021-40839)

Summary:	CVE-2021-40839 python-rencode: an infinite loop in typecode decoding allowing a remote DoS
Product:	[Other] Security Response	Reporter:	Marian Rehak <mrehak>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED UPSTREAM	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	jonathan.underwood, orion
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2021-09-14 18:21:41 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	2004109, 2004110
Bug Blocks:

Description Marian Rehak 2021-09-14 14:00:27 UTC

The rencode package through 1.0.6 for Python allows an infinite loop in typecode decoding (such as via ;\x2f\x7f), enabling a remote attack that consumes CPU and memory.

External Reference:

https://seclists.org/fulldisclosure/2021/Sep/16

Comment 1 Marian Rehak 2021-09-14 14:00:46 UTC

Created python-rencode tracking bugs for this issue:

Affects: epel-all [bug 2004110]
Affects: fedora-all [bug 2004109]

Comment 2 Product Security DevOps Team 2021-09-14 18:21:41 UTC

This CVE Bugzilla entry is for community support informational purposes only as it does not affect a package in a commercially supported Red Hat product. Refer to the dependent bugs for status of those individual community products.