CVE-2021-23953

Mozilla: Cross-origin information leakage via redirected PDF requests

Severity Score

4.3

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

If a user clicked into a specifically crafted PDF, the PDF reader could be confused into leaking cross-origin information, when said information is served as chunked data. This vulnerability affects Firefox < 85, Thunderbird < 78.7, and Firefox ESR < 78.7.

Si un usuario hace clic en un PDF diseñado específicamente, el lector de PDF podría confundirse y filtrar información de origen cruzado, cuando dicha información es servida como datos fragmentados. Esta vulnerabilidad afecta a Firefox versiones anteriores a 85, Thunderbird versiones anteriores a 78,7 y Firefox ESR versiones anteriores a 78,7

The Mozilla Foundation Security Advisory describes this flaw as:

If a user clicked into a specifically crafted PDF, the PDF reader could be confused into leaking cross-origin information, when said information is served as chunked data.

*Credits: N/A

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

Low

Integrity

None

Availability

None

Attack Vector

Network

Attack Complexity

Medium

Authentication

None

Confidentiality

Partial

Integrity

None

Availability

None

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2021-01-13 CVE Reserved
2021-01-28 CVE Published
2023-10-02 EPSS Updated
2024-08-03 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-829: Inclusion of Functionality from Untrusted Control Sphere

CAPEC

References (5)

URL	Tag	Source

URL	Date	SRC

URL	Date	SRC

URL	Date	SRC
https://www.mozilla.org/security/advisories/mfsa2021-03	2021-03-03
https://www.mozilla.org/security/advisories/mfsa2021-04	2021-03-03
https://www.mozilla.org/security/advisories/mfsa2021-05	2021-03-03
https://access.redhat.com/security/cve/CVE-2021-23953	2021-02-03
https://bugzilla.redhat.com/show_bug.cgi?id=1920646	2021-02-03

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"				< 85.0 Search vendor "Mozilla" for product "Firefox" and version " < 85.0"		-		Affected
Mozilla Search vendor "Mozilla"		Firefox Esr Search vendor "Mozilla" for product "Firefox Esr"				< 78.7 Search vendor "Mozilla" for product "Firefox Esr" and version " < 78.7"		-		Affected
Mozilla Search vendor "Mozilla"		Thunderbird Search vendor "Mozilla" for product "Thunderbird"				< 78.7 Search vendor "Mozilla" for product "Thunderbird" and version " < 78.7"		-		Affected