CVE2021

CVE-2021-41773

1Rules

6References

1Folders

2023-01-02Latest

Summary

CVE-2021-41773 is tracked here through 1 Sigma detection for exploitation attempts and related post-exploitation behavior observed in 2021. Coverage centers on webserver.

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Emerging Threathightest

CVE-2021-41773 Exploitation Attempt

Detects exploitation of flaw in path normalization in Apache HTTP server 2.4.49. An attacker could use a path traversal attack to map URLs to files outside the expected document root. If files outside of the document root are not protected by "require all denied" these requests can succeed. Additionally this flaw could leak the source of interpreted files like CGI scripts. This issue is known to be exploited in the wild. This issue only affects Apache 2.4.49 and not earlier versions.

Web Server Log

TA0001 · Initial AccessT1190 · Exploit Public-Facing Applicationcve.2021-41773detection.emerging-threats

daffainfo+1Tue Oct 052021

References