CVE-2021-29969

Mozilla: IMAP server responses sent by a MITM prior to STARTTLS could be processed

Severity Score

5.9

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

If Thunderbird was configured to use STARTTLS for an IMAP connection, and an attacker injected IMAP server responses prior to the completion of the STARTTLS handshake, then Thunderbird didn't ignore the injected data. This could have resulted in Thunderbird showing incorrect information, for example the attacker could have tricked Thunderbird to show folders that didn't exist on the IMAP server. This vulnerability affects Thunderbird < 78.12.

Si Thunderbird estaba configurado para usar STARTTLS para una conexión IMAP, y un atacante inyectaba las respuestas del servidor IMAP antes de la finalización del handshake STARTTLS, entonces Thunderbird no ignoraba los datos inyectados. Esto podría haber resultado en que Thunderbird mostrara información incorrecta, por ejemplo, el atacante podría haber engañado a Thunderbird para que mostrara carpetas que no existían en el servidor IMAP. Esta vulnerabilidad afecta a Thunderbird versiones anteriores a 78.12

*Credits: N/A

Attack Vector

Network

Attack Complexity

High

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

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

2021-04-01 CVE Reserved
2021-07-26 CVE Published
2024-04-20 EPSS Updated
2024-08-03 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-345: Insufficient Verification of Data Authenticity
CWE-552: Files or Directories Accessible to External Parties

CAPEC

References (4)

URL	Tag	Source

URL	Date	SRC

URL	Date	SRC

URL	Date	SRC
https://security.gentoo.org/glsa/202208-14	2022-12-09
https://www.mozilla.org/security/advisories/mfsa2021-30	2022-12-09
https://access.redhat.com/security/cve/CVE-2021-29969	2021-07-27
https://bugzilla.redhat.com/show_bug.cgi?id=1982015	2021-07-27

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"				< 78.12 Search vendor "Mozilla" for product "Thunderbird" and version " < 78.12"		-		Affected