Protect yourself against future threats.
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256
===========================================================================
AUSCERT External Security Bulletin Redistribution
ESB-2020.2803
Two new vulnerabilities found in Apache Struts, already
fixed in current version
14 August 2020
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: Apache Struts
Publisher: Apache
Operating System: Windows
UNIX variants (UNIX, Linux, OSX)
Impact/Access: Execute Arbitrary Code/Commands -- Existing Account
Denial of Service -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2019-0233 CVE-2019-0230
Original Bulletin:
https://struts.apache.org/announce.html#a20200813
Comment: Apache note that these newly-discovered vulnerabilities do not affect
the current version, 2.5.22, released in November 2019.
Members using previous versions of Struts, v2.0.0 to 2.5.20, will wish to patch.
- --------------------------BEGIN INCLUDED TEXT--------------------
Two new Struts Security Bulletins have been issued for Struts 2 by the
Apache Struts Security Team: [1]
S2-059 - Forced double OGNL evaluation, when evaluated on raw user input
in tag attributes, may lead to remote code execution (CVE-2019-0230) [2]
S2-060 - Access permission override causing a Denial of Service when
performing a file upload (CVE-2019-0233) [3]
Both issues affect Apache Struts in the version range 2.0.0 - 2.5.20.
The current version 2.5.22, which was released in November 2019, is not
affected.
CVE-2019-0230 has been reported by Matthias Kaiser, Apple Information
Security. By design, Struts 2 allows developers to utilize forced double
evaluation for certain tag attributes. When used with unvalidated, user
modifiable input, malicious OGNL expressions may be injected. In an
ongoing effort, the Struts framework includes mitigations for limiting
the impact of injected expressions, but Struts before 2.5.22 left an
attack vector open which is addressed by this report. [2]
However, we continue to urge developers building upon Struts 2 to not
use %{...} syntax referencing unvalidated user modifiable input in tag
attributes, since this is the ultimate fix for this class of
vulnerabilities. [4]
CVE-2019-0233 has been reported by Takeshi Terada of Mitsui Bussan
Secure Directions, Inc. In Struts before 2.5.22, when a file upload is
performed to an Action that exposes the file with a getter, an attacker
may manipulate the request such that the working copy of the uploaded
file or even the container temporary upload directory may be set to
read-only access. As a result, subsequent actions on the file or file
uploads in general will fail with an error. [3]
Both issues are already fixed in Apache Struts 2.5.22, which was
released in November 2019.
We strongly recommend all users to upgrade to Struts 2.5.22, if this has
not been done already. [5][6]
The Apache Struts Security Team would like to thank the reporters for
their efforts and their practice of responsible disclosure, as well as
their help while investigating the report and coordinating public
disclosure.
[1] https://struts.apache.org/announce.html#a20200813
[2] https://cwiki.apache.org/confluence/display/ww/s2-059
[3] https://cwiki.apache.org/confluence/display/ww/s2-060
[4]
https://struts.apache.org/security/#use-struts-tags-instead-of-raw-el-expressions
[5] https://cwiki.apache.org/confluence/display/WW/Version+Notes+2.5.22
[6] https://struts.apache.org/download.cgi#struts-ga
- --------------------------END INCLUDED TEXT--------------------
You have received this e-mail bulletin as a result of your organisation's
registration with AusCERT. The mailing list you are subscribed to is
maintained within your organisation, so if you do not wish to continue
receiving these bulletins you should contact your local IT manager. If
you do not know who that is, please send an email to auscert@auscert.org.au
and we will forward your request to the appropriate person.
NOTE: Third Party Rights
This security bulletin is provided as a service to AusCERT's members. As
AusCERT did not write the document quoted above, AusCERT has had no control
over its content. The decision to follow or act on information or advice
contained in this security bulletin is the responsibility of each user or
organisation, and should be considered in accordance with your organisation's
site policies and procedures. AusCERT takes no responsibility for consequences
which may arise from following or acting on information or advice contained in
this security bulletin.
NOTE: This is only the original release of the security bulletin. It may
not be updated when updates to the original are made. If downloading at
a later date, it is recommended that the bulletin is retrieved directly
from the author's website to ensure that the information is still current.
Contact information for the authors of the original document is included
in the Security Bulletin above. If you have any questions or need further
information, please contact them directly.
Previous advisories and external security bulletins can be retrieved from:
https://www.auscert.org.au/bulletins/
===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072
Internet Email: auscert@auscert.org.au
Facsimile: (07) 3365 7031
Telephone: (07) 3365 4417 (International: +61 7 3365 4417)
AusCERT personnel answer during Queensland business hours
which are GMT+10:00 (AEST).
On call after hours for member emergencies only.
===========================================================================
-----BEGIN PGP SIGNATURE-----
Comment: http://www.auscert.org.au/render.html?it=1967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=vIl4
-----END PGP SIGNATURE-----