Bug 1835982 (CVE-2018-1285) - CVE-2018-1285 log4net: XXE in applications that accept arbitrary configuration files from users
Summary: CVE-2018-1285 log4net: XXE in applications that accept arbitrary configuratio...
Keywords:
Status: CLOSED UPSTREAM
Alias: CVE-2018-1285
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1836221 1836222
Blocks:
TreeView+ depends on / blocked
 
Reported: 2020-05-14 20:29 UTC by Guilherme de Almeida Suckevicz
Modified: 2020-05-15 17:41 UTC (History)
3 users (show)

Fixed In Version:
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Environment:
Last Closed: 2020-05-15 15:15:21 UTC


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Description Guilherme de Almeida Suckevicz 2020-05-14 20:29:56 UTC
Apache log4net before 2.0.8 does not disable XML external entities when parsing log4net configuration files. This could allow for XXE-based attacks in applications that accept arbitrary configuration files from users.

References:
https://issues.apache.org/jira/browse/LOG4NET-575
https://lists.apache.org/thread.html/reab1c277c95310bad1038255e0757857b2fbe291411b4fa84552028a%40%3Cdev.logging.apache.org%3E

Comment 1 Timotheus Pokorra 2020-05-15 05:13:30 UTC
As far as I can see, we are using version 2.0.8 in all supported Fedora releases and in Epel 7 and 8:
We don't have a package in Epel 6.
https://apps.fedoraproject.org/packages/log4net

Comment 2 Timotheus Pokorra 2020-05-15 05:25:56 UTC
@Guilherme: you wrote "before 2.0.8", but the Apache issue says "Affected: log4net up to 2.0.8"

Here is the patch that fixes it: https://github.com/apache/logging-log4net/commit/d0b4b01

I will apply this to the packages.

Comment 3 Guilherme de Almeida Suckevicz 2020-05-15 12:53:07 UTC
In reply to comment #2:
> @Guilherme: you wrote "before 2.0.8", but the Apache issue says "Affected:
> log4net up to 2.0.8"
> 
> Here is the patch that fixes it:
> https://github.com/apache/logging-log4net/commit/d0b4b01
> 
> I will apply this to the packages.

This is the way it was reported to Mitre[1]. Since the package is affected by this issue I will create Fedora and EPEL trackers for it.
Thanks.

[1]. https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-1285

Comment 4 Guilherme de Almeida Suckevicz 2020-05-15 12:53:25 UTC
Created log4net tracking bugs for this issue:

Affects: epel-all [bug 1836222]
Affects: fedora-all [bug 1836221]

Comment 5 Product Security DevOps Team 2020-05-15 15:15:21 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.


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