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CVE-2021-3939

Date: November 16, 2021

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.

Severity Score

Related Resources (6)

https://nvd.nist.gov/vuln/detail/CVE-2021-3939
http://packetstormsecurity.com/files/172848/Ubuntu-accountsservice-Double-Free-Memory-Corruption.html
https://people.canonical.com/~ubuntu-security/cve/CVE-2021-3939
https://bugs.launchpad.net/ubuntu/+source/accountsservice/+bug/1950149
https://ubuntu.com/security/notices/USN-5149-1
https://www.mend.io/vulnerability-database/CVE-2021-3939

Severity Score

Weakness Type (CWE)

Release of Invalid Pointer or Reference

CWE-763

CVSS v3.1

Base Score:
Attack Vector (AV): LOCAL
Attack Complexity (AC): LOW
Privileges Required (PR): LOW
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): HIGH
Integrity (I): HIGH
Availability (A): HIGH

CVSS v2

Base Score:
Access Vector (AV): LOCAL
Access Complexity (AC): LOW
Authentication (AU): NONE
Confidentiality (C): COMPLETE
Integrity (I): COMPLETE
Availability (A): COMPLETE
Additional information:

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