CVE-2021-3939

Free of static data in accountsservice

Severity Score

7.8

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

Ubuntu-specific modifications to accountsservice (in patch file debian/patches/0010-set-language.patch) caused the fallback_locale variable, pointing to static storage, to be freed, in the user_change_language_authorized_cb function. This is reachable via the SetLanguage dbus function. This is fixed in versions 0.6.55-0ubuntu12~20.04.5, 0.6.55-0ubuntu13.3, 0.6.55-0ubuntu14.1.

Unas modificaciones específicas de Ubuntu a accountsservice (en el archivo de parche debian/patches/0010-set-language.patch) causaron la liberación de la variable fallback_locale, que apunta al almacenamiento estático, en la función user_change_language_authorized_cb. Esto es accesible por medio de la función dbus SetLanguage. Esto es corregido en las versiones 0.6.55-0ubuntu12~20.04.5, 0.6.55-0ubuntu13.3, 0.6.55-0ubuntu14.1

*Credits: Kevin Backhouse

CVSS Scores

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Attack Vector

Local

Attack Complexity

High

Privileges Required

Low

User Interaction

None

Scope

Changed

Confidentiality

High

Integrity

High

Availability

High

Attack Vector

Local

Attack Complexity

Low

Authentication

None

Confidentiality

Complete

Integrity

Complete

Availability

Complete

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2021-11-09 CVE Reserved
2021-11-17 CVE Published
2023-06-09 EPSS Updated
2024-09-16 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-590: Free of Memory not on the Heap
CWE-763: Release of Invalid Pointer or Reference

CAPEC

References (3)

URL	Tag	Source
http://packetstormsecurity.com/files/172848/Ubuntu-accountsservice-Double-Free-Memory-Corruption.html
https://bugs.launchpad.net/ubuntu/+source/accountsservice/+bug/1950149	Broken Link

URL	Date	SRC

URL	Date	SRC

URL	Date	SRC
https://ubuntu.com/security/notices/USN-5149-1	2023-06-12

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Canonical Search vendor "Canonical"		Accountsservice Search vendor "Canonical" for product "Accountsservice"				>= 0.6.55-0ubuntu12\~20.04 < 0.6.55-0ubuntu12\~20.05 Search vendor "Canonical" for product "Accountsservice" and version " >= 0.6.55-0ubuntu12\~20.04 < 0.6.55-0ubuntu12\~20.05"		-		Affected
Canonical Search vendor "Canonical"		Accountsservice Search vendor "Canonical" for product "Accountsservice"				>= 0.6.55-0ubuntu13 < 0.6.55-0ubuntu13.3 Search vendor "Canonical" for product "Accountsservice" and version " >= 0.6.55-0ubuntu13 < 0.6.55-0ubuntu13.3"		-		Affected
Canonical Search vendor "Canonical"		Accountsservice Search vendor "Canonical" for product "Accountsservice"				>= 0.6.55-0ubuntu14 < 0.6.55-0ubuntu14.1 Search vendor "Canonical" for product "Accountsservice" and version " >= 0.6.55-0ubuntu14 < 0.6.55-0ubuntu14.1"		-		Affected
Canonical Search vendor "Canonical"		Ubuntu Linux Search vendor "Canonical" for product "Ubuntu Linux"				20.04 Search vendor "Canonical" for product "Ubuntu Linux" and version "20.04"		lts		Affected
Canonical Search vendor "Canonical"		Ubuntu Linux Search vendor "Canonical" for product "Ubuntu Linux"				21.04 Search vendor "Canonical" for product "Ubuntu Linux" and version "21.04"		-		Affected
Canonical Search vendor "Canonical"		Ubuntu Linux Search vendor "Canonical" for product "Ubuntu Linux"				21.10 Search vendor "Canonical" for product "Ubuntu Linux" and version "21.10"		-		Affected