CVE-2022-29055: Uninitialized Pointer Access Vulnerability in Fortinet FortiOS and FortiProxy Versions

Common Vulnerabilities and Exposures (CVE) has identified and assigned CVE-2022-29055 to a security vulnerability affecting Fortinet FortiOS and FortiProxy versions. A remote, unauthenticated, or authenticated attacker can exploit this vulnerability and cause the sslvpn daemon to crash through an HTTP GET request. This post aims to provide exclusive details about the vulnerability, affected versions, code snippets, and original references to help users understand and mitigate the risk.

Vulnerability Details (CVE-2022-29055)

The CVE-2022-29055 vulnerability pertains to an uninitialized pointer access that can occur in the following versions of Fortinet products:

Versions 1.2.x

A remote attacker, whether authenticated or unauthenticated, can exploit this vulnerability by sending a specially crafted HTTP GET request targeting the SSL VPN daemon. The exploitation can lead to a crash in the sslvpn daemon, resulting in a denial of service (DoS) condition.

An example of a malicious HTTP GET request is shown below

GET /somepath/file.ext?arg=value HTTP/1.1
Host: target.example.com
User-Agent: python-requests/2.23.
Accept: */*
Connection: close

Workarounds and Remediation

As of now, Fortinet has not released any patches to address the CVE-2022-29055 vulnerability. Users of the affected Fortinet FortiOS and FortiProxy versions are advised to implement the following workarounds as a form of temporary mitigation:

Update Fortinet FortiOS and FortiProxy versions to a non-vulnerable version once available.

Additionally, users should follow the Fortinet Security Advisories webpage for updates on patches released by the vendor and detailed mitigation steps for the CVE-2022-29055 vulnerability.

Conclusion and References

The CVE-2022-29055 vulnerability is a crucial security risk affecting several Fortinet FortiOS and FortiProxy versions, potentially allowing attackers to crash the SSL VPN daemon and cause denial of service. This post has covered the vulnerability details, code snippets, affected versions, and original references to give users a comprehensive understanding of the issue. As Fortinet has not released a patch yet, users must implement the workarounds suggested above to mitigate the risk and keep their security infrastructure protected.

For more details and up-to-date information, users can refer to the following links

1. CVE-2022-29055 on the CVE website
2. Fortinet Security Advisories

Make sure to follow the suggested workarounds and stay informed on this vulnerability until an official patch is available.

Timeline

Published on: 10/18/2022 15:15:00 UTC
Last modified on: 10/20/2022 19:13:00 UTC