CVE-2021-29949

Mozilla: Thunderbird might execute an alternative OTR library

Severity Score

7.8

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

When loading the shared library that provides the OTR protocol implementation, Thunderbird will initially attempt to open it using a filename that isn't distributed by Thunderbird. If a computer has already been infected with a malicious library of the alternative filename, and the malicious library has been copied to a directory that is contained in the search path for executable libraries, then Thunderbird will load the incorrect library. This vulnerability affects Thunderbird < 78.9.1.

Cuando se carga la biblioteca compartida que proporciona la implementación del protocolo OTR, Thunderbird intentará inicialmente abrirla usando un nombre de archivo que no es distribuido por Thunderbird. Si un ordenador ya ha sido infectado con una biblioteca maliciosa con el nombre de archivo alternativo, y la biblioteca maliciosa ha sido copiada a un directorio que está contenido en la ruta de búsqueda de bibliotecas ejecutables, entonces Thunderbird cargará la biblioteca incorrecta. Esta vulnerabilidad afecta a Thunderbird versiones anteriores a 78.9.1

*Credits: N/A

Attack Vector

Local

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Attack Vector

Local

Attack Complexity

Medium

Authentication

None

Confidentiality

Partial

Integrity

Partial

Availability

Partial

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2021-04-01 CVE Reserved
2021-04-28 CVE Published
2024-03-09 EPSS Updated
2024-08-03 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-426: Untrusted Search Path
CWE-427: Uncontrolled Search Path Element

CAPEC

References (3)

URL	Tag	Source

URL	Date	SRC

URL	Date	SRC

URL	Date	SRC
https://www.mozilla.org/security/advisories/mfsa2021-13	2021-06-30
https://access.redhat.com/security/cve/CVE-2021-29949	2021-04-14
https://bugzilla.redhat.com/show_bug.cgi?id=1951872	2021-04-14

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Mozilla Search vendor "Mozilla"		Thunderbird Search vendor "Mozilla" for product "Thunderbird"				< 78.9.1 Search vendor "Mozilla" for product "Thunderbird" and version " < 78.9.1"		-		Affected