Apache – CVE-2021-39275

Description

Kayran has detected that the Version of Apache HTTP Server being used has an ‘Out-of-bounds Write’ vulnerability (CWE-787). Also known as CVE-2021-39275.

That means that the software writes data past the end, or before the beginning, of the intended buffer.
Typically, this can result in the corruption of data, crashes, or code executions.

The ap_escape_quotes() may write beyond the end of a buffer when given malicious inputs.
No included modules should be able to pass untrusted data to these functions, but third-party / external modules might do.
This will allow unauthenticated remote attackers to crash the server or potentially execute codes on the system with the privileges of an httpd user.

It will lead to information being disclosed, assisting attackers in performing attacks against your assets.
There’s a chance that this vulnerability will allow attackers to modify system files and information. Also, it could cause a decrease in performance and interruptions in the availability of resources.

Recommendation

To fix CVE-2021-39275, upgrade the version of Apache HTTP Server being used to 2.4.49 or higher.

References

https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-39275

https://cwe.mitre.org/data/definitions/787.html

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