Bug 887065 (CVE-2021-4249)

Summary:	<dev-haskell/xml-conduit-1.9.1.1: infinite loop via crafted xml
Product:	Gentoo Security	Reporter:	John Helmert III <ajak>
Component:	Vulnerabilities	Assignee:	Gentoo Security <security>
Status:	CONFIRMED ---
Severity:	minor	CC:	haskell
Priority:	Normal	Keywords:	PullRequest
Version:	unspecified
Hardware:	All
OS:	Linux
URL:	https://vuldb.com/?id.216204
See Also:	https://github.com/gentoo/gentoo/pull/36358
Whiteboard:	B4 [glsa?]
Package list:		Runtime testing required:	---

Description John Helmert III archtester

2022-12-18 22:06:45 UTC

CVE-2021-4249:

A vulnerability was found in xml-conduit. It has been classified as problematic. Affected is an unknown function of the file xml-conduit/src/Text/XML/Stream/Parse.hs of the component DOCTYPE Entity Expansion Handler. The manipulation leads to infinite loop. It is possible to launch the attack remotely. Upgrading to version 1.9.1.0 is able to address this issue. The name of the patch is 4be1021791dcdee8b164d239433a2043dc0939ea. It is recommended to upgrade the affected component. The identifier of this vulnerability is VDB-216204.

Patch is: https://github.com/snoyberg/xml/commit/4be1021791dcdee8b164d239433a2043dc0939ea

I see that commit has a tag for xml-hamlet-0.5.0.2 and for
html-conduit-1.3.2.2. Are both Gentoo packages affected?

Comment 1 Christopher Fore 2024-05-03 14:39:09 UTC

I brought this up in the -haskell channel regarding the PR and they said this only affects xml-conduit. Upstream just produces multiple packages from one repository so the tags for those made their way onto the commit.

Comment 2 Larry the Git Cow gentoo-dev

2025-05-21 10:11:30 UTC

The bug has been referenced in the following commit(s):

https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=579f6b8babb24f03b82884a523a0f7c0fe4b8e9b

commit 579f6b8babb24f03b82884a523a0f7c0fe4b8e9b
Author:     Christopher Fore <csfore@posteo.net>
AuthorDate: 2024-04-22 16:22:08 +0000
Commit:     Mark Wright <gienah@gentoo.org>
CommitDate: 2025-05-21 10:10:14 +0000

    dev-haskell/html-conduit: add 1.3.2.2
    
    - Fix trivial QA warning
      - Empty IUSE
    
    Bug: https://bugs.gentoo.org/887065
    Closes: https://github.com/gentoo/gentoo/pull/36358
    Signed-off-by: Christopher Fore <csfore@posteo.net>
    Signed-off-by: Mark Wright <gienah@gentoo.org>

 dev-haskell/html-conduit/Manifest                  |  1 +
 .../html-conduit/html-conduit-1.3.2.2.ebuild       | 32 ++++++++++++++++++++++
 2 files changed, 33 insertions(+)