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Date: Fri, 13 Mar 2020 07:33:45 +0100
From: Oliver Heger <oheger@...che.org>
To: oss-security@...ts.openwall.com
Subject: [CVE-2020-1953] Uncontrolled class instantiation when loading YAML
files in Apache Commons Configuration
CVE-2020-1953: Uncontrolled class instantiation when loading YAML files
in Apache Commons Configuration
Severity: Moderate
Vendor:
The Apache Software Foundation
Versions Affected:
2.2 to 2.6
Description:
Apache Commons Configuration uses a third-party library to parse YAML
files which by default allows the instantiation of classes if the YAML
includes special statements. If a YAML file is from an untrusted source,
it can therefore load and execute code out of the control of the host
application.
Mitigation:
Users should upgrade to to 2.7, which prevents class instantiation by
the YAML processor.
Credit:
This issue was discovered by Daniel Kalinowski of ISEC.pl Research Team
Oliver Heger
on behalf of the Apache Commons PMC
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