CVE-2021-3939: 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…

High severity · published Nov 17, 2021

CVE-2021-3939

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…

7.8

CVSS

0.4%

EPSS

On KEV

Description

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.

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Attack vector

Local

Complexity

Low

Privileges

Low

User interaction

None

Confidentiality

High

Integrity

High

Availability

High

Scope

Unchanged

Exploitation

Is it being used?

Exploit prediction (EPSS)0.4% · higher than 31% of CVEs

Exploited in the wildNo evidence yet

CISA KEVNot listed

Ransomware campaign useNot known

Affected products

Which versions

Accountsservice · Canonical

0.6.55-0ubuntu12\~20.04 before 0.6.55-0ubuntu12\~20.05; 0.6.55-0ubuntu13 before 0.6.55-0ubuntu13.3; 0.6.55-0ubuntu14 before 0.6.55-0ubuntu14.1 · source: NVD

Ubuntu Linux · Canonical

20.04; 21.04; 21.10 · source: NVD

Affected product

Accountsservice

Canonical

All Accountsservice CVEs

References

NVD

https://nvd.nist.gov/vuln/detail/CVE-2021-3939

CVE.org

https://www.cve.org/CVERecord?id=CVE-2021-3939

packetstormsecurity.com

http://packetstormsecurity.com/files/172848/Ubuntu-accountsservice-Double-Free-Memory-Corruption.html

Broken Link

https://bugs.launchpad.net/ubuntu/+source/accountsservice/+bug/1950149

Vendor Advisory

https://ubuntu.com/security/notices/USN-5149-1