CVE-2021-3939: Free of static data in accountsservice
First published: Tue Nov 16 2021(Updated: )
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.
Credit: security@ubuntu.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| ubuntu/accountsservice | <0.6.55-0ubuntu12~20.04.5 | 0.6.55-0ubuntu12~20.04.5 |
| ubuntu/accountsservice | <0.6.55-0ubuntu13.3 | 0.6.55-0ubuntu13.3 |
| ubuntu/accountsservice | <0.6.55-0ubuntu14.1 | 0.6.55-0ubuntu14.1 |
| ubuntu/accountsservice | <0.6.55-3ubuntu2 | 0.6.55-3ubuntu2 |
| debian/accountsservice | 0.6.55-3 22.08.8-6 23.13.9-7 | |
| AccountsService | >=0.6.55-0ubuntu12\~20.04<0.6.55-0ubuntu12\~20.05 | |
| AccountsService | >=0.6.55-0ubuntu13<0.6.55-0ubuntu13.3 | |
| AccountsService | >=0.6.55-0ubuntu14<0.6.55-0ubuntu14.1 | |
| Ubuntu | =20.04 | |
| Ubuntu | =21.04 | |
| Ubuntu | =21.10 |
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Reference Links
- http://packetstormsecurity.com/files/172848/Ubuntu-accountsservice-Double-Free-Memory-Corruption.html
- https://bugs.launchpad.net/ubuntu/+source/accountsservice/+bug/1950149
- https://ubuntu.com/security/notices/USN-5149-1
- https://launchpad.net/bugs/cve/CVE-2021-3939
- https://www.cve.org/CVERecord?id=CVE-2021-3939
- https://nvd.nist.gov/vuln/detail/CVE-2021-3939
- https://security-tracker.debian.org/tracker/CVE-2021-3939
- https://ubuntu.com/security/CVE-2021-3939
Frequently Asked Questions
What is the vulnerability ID for this Ubuntu-specific modifications to accountsservice vulnerability?
The vulnerability ID is CVE-2021-3939.
What is the severity level of CVE-2021-3939?
The severity level of CVE-2021-3939 is high with a value of 7.8.
What is the affected software for CVE-2021-3939?
The affected software for CVE-2021-3939 is accountsservice on Ubuntu and Canonical Accountsservice.
How can I fix CVE-2021-3939?
To fix CVE-2021-3939, update the accountsservice package to the recommended versions listed in the Ubuntu or Debian repositories.
Where can I find more information about CVE-2021-3939?
More information about CVE-2021-3939 can be found in the references: [link1], [link2], [link3].
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- canonical/accountsservice
- version/accountsservice/0.6.55-0ubuntu12\~20.04
- version/accountsservice/0.6.55-0ubuntu13
- version/accountsservice/0.6.55-0ubuntu14
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- version/ubuntu/21.04
- version/ubuntu/21.10