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CVE-2021-31805 RCE BUG IN APACHE STRUTS WAS FINALLY PATCHED

April 13, 2022  By Pierluigi Paganini


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APACHE ADDRESSED A CRITICAL FLAW IN APACHE STRUTS RCE THAT WAS LINKED TO A
PREVIOUS ISSUE THAT WAS NOT PROPERLY FIXED.

Apache Struts is an open-source web application framework for developing Java EE
web applications.

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The Apache Software Foundation urges organizations to address a vulnerability,
tracked as CVE-2021-31805, affecting Struts versions ranging 2.0.0 to 2.5.29. An
attacker could trigger this vulnerability to take control of an affected system.

According to the advisory published by Apache, the issue addressed by the
organization is a critical flaw in Apache Struts linked to a previous OGNL
Injection flaw (CVE-2020-17530) that wasn’t properly fixed.

The remote code execution flaw, tracked as CVE-2020-17530, resides in forced
OGNL evaluation when evaluated on raw user input in tag attributes.

“Forced OGNL evaluation, when evaluated on raw user input in tag attributes, may
lead to remote code execution – similar to S2-059.” reads the advisory published
by the Apache Software Foundation. “Some of the tag’s attributes could perform a
double evaluation if a developer applied forced OGNL evaluation by using
the %{...} syntax. Using forced OGNL evaluation on untrusted user input can lead
to a Remote Code Execution and security degradation.”

Upon forcing OGNL evaluation using the %{…} syntax, tag’s attributes could
perform double evaluation. Forced OGNL evaluation on untrusted input it is
possible to achieve remote code execution.

“The fix issued for CVE-2020-17530 (S2-061) was incomplete. Still some of the
tag’s attributes could perform a double evaluation if a developer applied forced
OGNL evaluation by using the %{…} syntax. Using forced OGNL evaluation on
untrusted user input can lead to a Remote Code Execution and security
degradation.” reads the advisory published by Apache.

CISA also published a security advisory for Struts 2 recommending
organizations to upgrade their installs.

Apache advisory recommends avoiding using forced OGNL evaluation on untrusted
user input, and/or upgrade to Struts 2.5.30 or greater which checks if
expression evaluation won’t lead to the double evaluation.



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Pierluigi Paganini

(SecurityAffairs – hacking, Apache)





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PIERLUIGI PAGANINI

Pierluigi Paganini is member of the ENISA (European Union Agency for Network and
Information Security) Threat Landscape Stakeholder Group and Cyber G7 Group, he
is also a Security Evangelist, Security Analyst and Freelance Writer.
Editor-in-Chief at "Cyber Defense Magazine", Pierluigi is a cyber security
expert with over 20 years experience in the field, he is Certified Ethical
Hacker at EC Council in London. The passion for writing and a strong belief that
security is founded on sharing and awareness led Pierluigi to find the security
blog "Security Affairs" recently named a Top National Security Resource for US.
Pierluigi is a member of the "The Hacker News" team and he is a writer for some
major publications in the field such as Cyber War Zone, ICTTF, Infosec Island,
Infosec Institute, The Hacker News Magazine and for many other Security
magazines. Author of the Books "The Deep Dark Web" and “Digital Virtual Currency
and Bitcoin”.




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