CVE-2023-27488

Public on

Last Modified: UTC

Description

A flaw was found in Envoy which could allow an attacker to bypass authentication checks when ext_authz is used by crafting a malicious http header with a non-UTF8 value.

A flaw was found in Envoy which could allow an attacker to bypass authentication checks when ext_authz is used by crafting a malicious http header with a non-UTF8 value.

Additional information

  • Bugzilla 2182156: envoy: gRPC client produces invalid protobuf when an HTTP header with non-UTF8 value is received
  • FAQ: Frequently asked questions about CVE-2023-27488

Common Vulnerability Scoring System (CVSS) Score Details

Important note

CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).

CVSS v3 Score Breakdown
Red HatNVD

CVSS v3 Base Score

8.6

9.8

Attack Vector

Network

Network

Attack Complexity

Low

Low

Privileges Required

None

None

User Interaction

None

None

Scope

Unchanged

Unchanged

Confidentiality Impact

Low

High

Integrity Impact

High

High

Availability Impact

Low

High

CVSS v3 Vector

Red Hat: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:L

NVD: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Red Hat CVSS v3 Score Explanation

Confidentiality and Availability are low as they are post-exploitation impacts and not the direct threat of authentication bypass.

Confidentiality and Availability are low as they are post-exploitation impacts and not the direct threat of authentication bypass.

Frequently Asked Questions

Why is Red Hat's CVSS v3 score or Impact different from other vendors?

My product is listed as "Under investigation" or "Affected", when will Red Hat release a fix for this vulnerability?

What can I do if my product is listed as "Will not fix"?

What can I do if my product is listed as "Fix deferred"?

What is a mitigation?

I have a Red Hat product but it is not in the above list, is it affected?

Why is my security scanner reporting my product as vulnerable to this vulnerability even though my product version is fixed or not affected?

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