Forced OGNL evaluation, when evaluated on raw not validated user input in tag attributes, may lead to RCE.
CVE-2021-31805

9.8CRITICAL

Key Information:

Vendor

Apache
Status
Apache Struts
Vendor
CVE Published:
12 April 2022

Badges

👾 Exploit Exists🟡 Public PoC🟣 EPSS 93%

What is CVE-2021-31805?

The fix issued for CVE-2020-17530 was incomplete. So from Apache Struts 2.0.0 to 2.5.29, 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.

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Affected Version(s)

Apache Struts 2.0.0 to 2.5.29

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2021-31805
Created by Wrin9

S2-062
Created by jax7sec

Struts2_S2-062_CVE-2021-31805
Created by Axx8

References

https://cwiki.apache.org/confluence/display/WW/S2-062
x_refsource_MISC
http://www.openwall.com/lists/oss-security/2022/04/12/6
mailing-listx_refsource_MLIST
https://www.oracle.com/security-alerts/cpujul2022.html
x_refsource_MISC

EPSS Score

93% chance of being exploited in the next 30 days.

CVSS V3.1

Score:
9.8
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Apache Struts would like to thank Chris McCown for reporting this issue!
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