CVE-2023-23603

Mozilla: Calls to <code>console.log</code> allowed bypasing Content Security Policy via format directive

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

Regular expressions used to filter out forbidden properties and values from style directives in calls to <code>console.log</code> weren't accounting for external URLs. Data could then be potentially exfiltrated from the browser. This vulnerability affects Firefox < 109, Thunderbird < 102.7, and Firefox ESR < 102.7.

The Mozilla Foundation Security Advisory describes this flaw as: Regular expressions used to filter out forbidden properties and values from style directives in calls to `console.log` weren't accounting for external URLs. Data could then be potentially exfiltrated from the browser.

An update that fixes 9 vulnerabilities is now available. This update for MozillaThunderbird fixes the following issues. Updated to version 102.7.1. Fixed out of date libusrsctp. Fixed arbitrary file read from GTK drag and drop on Linux. Fixed issue where malicious command that could be hidden in devtools output on Windows. Fixed issue where URL being dragged from cross-origin iframe into same tab triggers navigation. Fixed Content Security Policy not being correctly applied to WebSockets in WebWorkers. Fixed fullscreen notification bypass. Fixed issue where calls to code tag allowed bypassing Content Security Policy via format directive. Fixed memory safety bugs.

*Credits: N/A

CVSS Scores

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

None

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

Authentication

None

Confidentiality

Complete

Integrity

None

Availability

None

* Common Vulnerability Scoring System

SSVC

Decision:Track

Exploitation

None

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-185: Incorrect Regular Expression
CWE-770: Allocation of Resources Without Limits or Throttling

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-2023-23603	2023-01-26
https://bugzilla.redhat.com/show_bug.cgi?id=2162343	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