Vulnerability Details 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 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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.002
EPSS Ranking 38.0%
CVSS Severity
CVSS v3 Score 7.8
CVSS v2 Score 7.2
References
- 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
- 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
Products affected by CVE-2021-3939
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cpe:2.3:a:canonical:accountsservice:0.6.55-0ubuntu12~20.04
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cpe:2.3:a:canonical:accountsservice:0.6.55-0ubuntu12~20.04.6
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cpe:2.3:a:canonical:accountsservice:0.6.55-0ubuntu13
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cpe:2.3:a:canonical:accountsservice:0.6.55-0ubuntu14
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cpe:2.3:o:canonical:ubuntu_linux:20.04
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cpe:2.3:o:canonical:ubuntu_linux:21.04
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cpe:2.3:o:canonical:ubuntu_linux:21.10