Bug 1946269 (CVE-2021-29421)

Summary:	CVE-2021-29421 pikepdf: XML external entity issue when parsing XMP metadata entries
Product:	[Other] Security Response	Reporter:	Pedro Sampaio <psampaio>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED WONTFIX	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	python-sig, quantum.analyst, ribarry, zdohnal
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	pikepdf 2.10.0	Doc Type:	If docs needed, set a value
Doc Text:	There's a flaw in the pikepdf Python library's XMP metadata parsing functionality. An attacker who is able to submit a crafted PDF file to be processed by pikepdf could trigger an XML External Entity (XXE) injection. The highest threat of this flaw is to confidentiality of data.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2021-11-02 23:26:55 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:	1946270, 1946708
Bug Blocks:	1946271

Description Pedro Sampaio 2021-04-05 16:01:51 UTC

models/metadata.py in the pikepdf package 1.3.0 through 2.9.2 for Python allows XXE when parsing XMP metadata entries.

Upstream patch:

https://github.com/pikepdf/pikepdf/commit/3f38f73218e5e782fe411ccbb3b44a793c0b343a

Comment 1 Pedro Sampaio 2021-04-05 16:02:13 UTC

Created python-pikepdf tracking bugs for this issue:

Affects: fedora-all [bug 1946270]

Comment 2 Todd Cullum 2021-04-06 17:16:11 UTC

*** Bug 1945364 has been marked as a duplicate of this bug. ***

Comment 4 Todd Cullum 2021-04-06 17:29:13 UTC

Statement:

This flaw does not affect any Red Hat shipped commercial products, as pikepdf is not currently shipped.

Comment 5 Todd Cullum 2021-04-06 17:29:15 UTC

External References:

https://github.com/pikepdf/pikepdf/blob/master/docs/release_notes.rst