teler-waf contains detection rule bypass via Entities payload
Moderate severity
GitHub Reviewed
Published
Mar 1, 2023
in
teler-sh/teler-waf
•
Updated May 20, 2024
Description
Published to the GitHub Advisory Database
Mar 1, 2023
Reviewed
Mar 1, 2023
Published by the National Vulnerability Database
Mar 3, 2023
Last updated
May 20, 2024
Description
teler-waf is a Go HTTP middleware that provides teler IDS functionality to protect against web-based attacks. teler-waf prior to version v0.2.0 is vulnerable to a bypass attack when a specific case-sensitive hex entities payload with special characters such as CR/LF and horizontal tab is used. This vulnerability allows an attacker to execute arbitrary JavaScript code on the victim's browser and compromise the security of the web application.
Impact
An attacker can exploit this vulnerability to bypass common web attack threat rules in teler-waf and launch cross-site scripting (XSS) attacks. The attacker can execute arbitrary JavaScript code on the victim's browser and steal sensitive information, such as login credentials and session tokens, or take control of the victim's browser and perform malicious actions.
Patches
Version v0.2.0 includes a patch for this vulnerability.
Workarounds
We advised updating their installations to version v0.2.0 and frontwards immediately.
References