REDHAT-BUG-1698020: High severity envoy proxy vulnerability
A flaw was found in Envoy 1.9.0 and older. When parsing HTTP/1.x header values, Envoy does not reject embedded zero characters (NUL, ASCII 0x0). This allows remote attackers crafting header values containing embedded NUL characters to potentially bypass header matching rules, gaining access to unauthorized resources.
Upstream issue:
https://github.com/envoyproxy/envoy/issues/6434
References:
https://istio.io/blog/2019/announcing-1.1.2/
Affected Software
Event History
Frequently Asked Questions
What is the severity of REDHAT-BUG-1698020?
The severity of REDHAT-BUG-1698020 is considered high due to the potential for remote attackers to exploit the flaw.
How do I fix REDHAT-BUG-1698020?
To fix REDHAT-BUG-1698020, upgrade Envoy to version 1.10.0 or later, which addresses the vulnerability.
What versions are affected by REDHAT-BUG-1698020?
Versions of Envoy up to and including 1.9.0 are affected by REDHAT-BUG-1698020.
What is the impact of REDHAT-BUG-1698020?
The impact of REDHAT-BUG-1698020 allows remote attackers to bypass header matching rules, potentially gaining unauthorized access.
Is there a workaround for REDHAT-BUG-1698020?
A temporary workaround for REDHAT-BUG-1698020 is to implement strict validation of header values to reject NUL characters.