Apache HTTP Server 2.4.49 - Path Traversal (CVE-2021-41773)


Application Details

The Apache HTTP Server is a free and open-source cross-platform web server software.


Vulnerability

Apache HTTP Server could allow a remote attacker to traverse directories on the system, caused by a flaw that was found in a change made to path normalization.


Identification

An attacker could send a specially crafted URL request to map URLs to files outside the expected document root.

POST /cgi-bin/../../../../bin/sh
PAYLOAD - echo;id


Detection

By turning this vulnerability into a traffic file and matching rule, we are able to detect attempts to traverse directories in the application.


Coverage

Idappcom has created signature 8021873 along with a traffic file.


References

CVE-2021-41773

NIST NVD (CVE-2021-41773)


Traffic IQ

If you are concerned that your business may be at risk of this vulnerability or others why not try out our Traffic IQ software which can share your defences and report any issues. Learn more here: https://www.idappcom.co.uk/traffic-iq-professional