CVE-2023-35943

Envoy vulnerable to CORS filter segfault when origin header is removed

Severity Score

7.5

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

Track*

*SSVC

Descriptions

Envoy is an open source edge and service proxy designed for cloud-native applications. Prior to versions 1.27.0, 1.26.4, 1.25.9, 1.24.10, and 1.23.12, the CORS filter will segfault and crash Envoy when the `origin` header is removed and deleted between `decodeHeaders`and `encodeHeaders`. Versions 1.27.0, 1.26.4, 1.25.9, 1.24.10, and 1.23.12 have a fix for this issue. As a workaround, do not remove the `origin` header in the Envoy configuration.

A flaw was found in Envoy. Suppose an origin header is configured to be removed with request_headers_to_remove: origin. The CORS filter will segfault and crash Envoy when the origin header is removed and deleted between decodeHeaders and encodeHeaders.

Red Hat OpenShift Service Mesh is Red Hat's distribution of the Istio service mesh project, tailored for installation into an on-premise OpenShift Container Platform installation. Issues addressed include a memory leak vulnerability.

*Credits: N/A

CVSS Scores

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

Required

Scope

Unchanged

Confidentiality

Low

Integrity

None

Availability

High

Attack Vector

Network

Attack Complexity

Low

Authentication

None

Confidentiality

None

Integrity

None

Availability

Complete

* Common Vulnerability Scoring System

SSVC

Decision:Track*

Exploitation

Poc

Automatable

Tech. Impact

Partial

* Organization's Worst-case Scenario

Timeline

2023-06-20 CVE Reserved
2023-07-25 CVE Published
2024-10-24 CVE Updated
2024-10-24 First Exploit
2025-04-15 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date

CWE

CWE-416: Use After Free

CAPEC

References (3)

URL	Tag	Source

URL	Date	SRC
https://github.com/envoyproxy/envoy/security/advisories/GHSA-mc6h-6j9x-v3gq	2024-10-24

URL	Date	SRC

URL	Date	SRC
https://access.redhat.com/security/cve/CVE-2023-35943	2023-08-11
https://bugzilla.redhat.com/show_bug.cgi?id=2217987	2023-08-11

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Envoyproxy Search vendor "Envoyproxy"		Envoy Search vendor "Envoyproxy" for product "Envoy"				>= 1.23.0 < 1.23.12 Search vendor "Envoyproxy" for product "Envoy" and version " >= 1.23.0 < 1.23.12"		-		Affected
Envoyproxy Search vendor "Envoyproxy"		Envoy Search vendor "Envoyproxy" for product "Envoy"				>= 1.24.0 < 1.24.10 Search vendor "Envoyproxy" for product "Envoy" and version " >= 1.24.0 < 1.24.10"		-		Affected
Envoyproxy Search vendor "Envoyproxy"		Envoy Search vendor "Envoyproxy" for product "Envoy"				>= 1.25.0 < 1.25.9 Search vendor "Envoyproxy" for product "Envoy" and version " >= 1.25.0 < 1.25.9"		-		Affected
Envoyproxy Search vendor "Envoyproxy"		Envoy Search vendor "Envoyproxy" for product "Envoy"				>= 1.26.0 < 1.26.4 Search vendor "Envoyproxy" for product "Envoy" and version " >= 1.26.0 < 1.26.4"		-		Affected