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Ubuntu Security Notice USN-4616-1
November 03, 2020
accountsservice vulnerabilities
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A security issue affects these releases of Ubuntu and its derivatives:
– Ubuntu 20.10
– Ubuntu 20.04 LTS
– Ubuntu 18.04 LTS
– Ubuntu 16.04 LTS
Summary:
Several security issues were fixed in AccountsService.
Software Description:
– accountsservice: query and manipulate user account information
Details:
Kevin Backhouse discovered that AccountsService incorrectly dropped
privileges. A local user could possibly use this issue to cause
AccountsService to crash or hang, resulting in a denial of service.
(CVE-2020-16126)
Kevin Backhouse discovered that AccountsService incorrectly handled reading
.pam_environment files. A local user could possibly use this issue to cause
AccountsService to crash or hang, resulting in a denial of service. This
issue only affected Ubuntu 20.04 LTS and Ubuntu 20.10. (CVE-2020-16127)
Matthias Gerstner discovered that AccountsService incorrectly handled
certain path checks. A local attacker could possibly use this issue to
read arbitrary files. This issue only affected Ubuntu 16.04 LTS and Ubuntu
18.04 LTS. (CVE-2018-14036)
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 20.10:
accountsservice 0.6.55-0ubuntu13.2
libaccountsservice0 0.6.55-0ubuntu13.2
Ubuntu 20.04 LTS:
accountsservice 0.6.55-0ubuntu12~20.04.4
libaccountsservice0 0.6.55-0ubuntu12~20.04.4
Ubuntu 18.04 LTS:
accountsservice 0.6.45-1ubuntu1.3
libaccountsservice0 0.6.45-1ubuntu1.3
Ubuntu 16.04 LTS:
accountsservice 0.6.40-2ubuntu11.6
libaccountsservice0 0.6.40-2ubuntu11.6
After a standard system update you need to reboot your computer to make
all the necessary changes.
References:
https://usn.ubuntu.com/4616-1
CVE-2018-14036, CVE-2020-16126, CVE-2020-16127
Package Information:
https://launchpad.net/ubuntu/+source/accountsservice/0.6.55-0ubuntu13.2
https://launchpad.net/ubuntu/+source/accountsservice/0.6.55-0ubuntu12~20.04.4
https://launchpad.net/ubuntu/+source/accountsservice/0.6.45-1ubuntu1.3
https://launchpad.net/ubuntu/+source/accountsservice/0.6.40-2ubuntu11.6
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