Vulnerability 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 Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Canonical | Accountsservice | >= 0.6.55-0ubuntu12\~20.04, < 0.6.55-0ubuntu12\~20.05 |
| Canonical | Ubuntu Linux | 20.04 |
Related Weaknesses (CWE)
References
- http://packetstormsecurity.com/files/172848/Ubuntu-accountsservice-Double-Free-M
- https://bugs.launchpad.net/ubuntu/+source/accountsservice/+bug/1950149Broken Link
- https://ubuntu.com/security/notices/USN-5149-1Vendor Advisory
- http://packetstormsecurity.com/files/172848/Ubuntu-accountsservice-Double-Free-M
- https://bugs.launchpad.net/ubuntu/+source/accountsservice/+bug/1950149Broken Link
- https://ubuntu.com/security/notices/USN-5149-1Vendor Advisory
FAQ
What is CVE-2021-3939?
CVE-2021-3939 is a vulnerability with a CVSS score of 7.8 (HIGH). 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...
How severe is CVE-2021-3939?
CVE-2021-3939 has been rated HIGH with a CVSS base score of 7.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2021-3939?
Check the references section above for vendor advisories and patch information. Affected products include: Canonical Accountsservice, Canonical Ubuntu Linux.