CVE-2023-23602

Mozilla: Content Security Policy wasn't being correctly applied to WebSockets in WebWorkers

Severity Score

6.5

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

Track*

*SSVC

Descriptions

A mishandled security check when creating a WebSocket in a WebWorker caused the Content Security Policy connect-src header to be ignored. This could lead to connections to restricted origins from inside WebWorkers. This vulnerability affects Firefox < 109, Thunderbird < 102.7, and Firefox ESR < 102.7.

The Mozilla Foundation Security Advisory describes this flaw as: A mishandled security check when creating a WebSocket in a WebWorker caused the Content Security Policy connect-src header to be ignored. This could lead to connections to restricted origins from inside WebWorkers.

USN-5816-1 fixed vulnerabilities in Firefox. The update introduced several minor regressions. This update fixes the problem. Niklas Baumstark discovered that a compromised web child process of Firefox could disable web security opening restrictions, leading to a new child process being spawned within the file:// context. Tom Schuster discovered that Firefox was not performing a validation check on GTK drag data. An attacker could potentially exploits this to obtain sensitive information. Various other issues were also addressed.

*Credits: N/A

CVSS Scores

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

None

Integrity

High

Availability

None

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Changed

Confidentiality

Low

Integrity

Low

Availability

None

Attack Vector

Network

Attack Complexity

Low

Authentication

None

Confidentiality

None

Integrity

Complete

Availability

None

* Common Vulnerability Scoring System

SSVC

Decision:Track*

Exploitation

Poc

Automatable

Tech. Impact

Partial

* Organization's Worst-case Scenario

Timeline

2023-01-16 CVE Reserved
2023-01-19 CVE Published
2025-01-10 CVE Updated
2025-03-30 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-754: Improper Check for Unusual or Exceptional Conditions
CWE-1385: Missing Origin Validation in WebSockets

CAPEC

References (5)

URL	Tag	Source

URL	Date	SRC

URL	Date	SRC

URL	Date	SRC
https://www.mozilla.org/security/advisories/mfsa2023-01	2023-06-08
https://www.mozilla.org/security/advisories/mfsa2023-02	2023-06-08
https://www.mozilla.org/security/advisories/mfsa2023-03	2023-06-08
https://access.redhat.com/security/cve/CVE-2023-23602	2023-01-26
https://bugzilla.redhat.com/show_bug.cgi?id=2162341	2023-01-26

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Mozilla Search vendor "Mozilla"		Firefox Search vendor "Mozilla" for product "Firefox"				< 109.0 Search vendor "Mozilla" for product "Firefox" and version " < 109.0"		-		Affected
Mozilla Search vendor "Mozilla"		Firefox Esr Search vendor "Mozilla" for product "Firefox Esr"				< 102.7 Search vendor "Mozilla" for product "Firefox Esr" and version " < 102.7"		-		Affected
Mozilla Search vendor "Mozilla"		Thunderbird Search vendor "Mozilla" for product "Thunderbird"				< 102.7 Search vendor "Mozilla" for product "Thunderbird" and version " < 102.7"		-		Affected