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.

Vulnerability/
REDHAT-BUG-1698020

high

9/4/2019

16/2/2021

REDHAT-BUG-1698020

First published: Tue Apr 09 2019(Updated: )

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: <a href="https://github.com/envoyproxy/envoy/issues/6434">https://github.com/envoyproxy/envoy/issues/6434</a> References: <a href="https://istio.io/blog/2019/announcing-1.1.2/">https://istio.io/blog/2019/announcing-1.1.2/</a>

Affected Software	Affected Version	How to fix
Envoy Envoy	<1.9.0

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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.

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agent/last-modified-date
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collector/redhat-bugzilla
source/Red Hat
alias/CVE-2019-9900
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agent/references
agent/severity
agent/description
agent/event
agent/softwarecombine
agent/tags
agent/guess-ai
agent/software-canonical-lookup
agent/software-canonical-lookup-request
vendor/envoy
canonical/envoy envoy

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