CVE-2021-31805: Improper Neutralization of Special Elements used in an Expression Language Statement ('Expression Language Injection')

April 12, 2022 (updated July 25, 2022)

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.

References

www.openwall.com/lists/oss-security/2022/04/12/6
cwiki.apache.org/confluence/display/WW/S2-062
nvd.nist.gov/vuln/detail/CVE-2021-31805
security.netapp.com/advisory/ntap-20220420-0001/

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