[USN-4616-2] AccountsService vulnerabilities

[Leonidas S. Barbosa]

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Ubuntu Security Notice USN-4616-2
November 04, 2020

accountsservice vulnerabilities
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 14.04 ESM

Summary:

Several security issues were fixed in AccountsService.

Software Description:
- accountsservice: query and manipulate user account information

Details:

USN-4616-1 fixed several vulnerabilities in AccountsService. This update provides
the corresponding update for Ubuntu 14.04 ESM.

Original advisory 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)

 Matthias Gerstner discovered that AccountsService incorrectly handled
 certain path checks. A local attacker could possibly use this issue to
 read arbitrary files. (CVE-2018-14036)

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 14.04 ESM:
  accountsservice                 0.6.35-0ubuntu7.3+esm2
  libaccountsservice0             0.6.35-0ubuntu7.3+esm2

After a standard system update you need to reboot your computer to make
all the necessary changes.

References:
  https://usn.ubuntu.com/4616-2
  https://usn.ubuntu.com/4616-1
  CVE-2018-14036, CVE-2020-16126
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