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Vulnerability of AccountsService: denial of service via pam_environment

Synthesis of the vulnerability 

An attacker can trigger a fatal error via pam_environment of AccountsService, in order to trigger a denial of service.
Vulnerable products: Ubuntu.
Severity of this weakness: 1/4.
Creation date: 03/11/2020.
Références of this bulletin: CVE-2020-16127, USN-4616-1, USN-4616-2, VIGILANCE-VUL-33780.

Description of the vulnerability 

An attacker can trigger a fatal error via pam_environment of AccountsService, in order to trigger a denial of service.
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This computer threat impacts software or systems such as Ubuntu.

Our Vigil@nce team determined that the severity of this computer vulnerability alert is low.

The trust level is of type confirmed by the editor, with an origin of user shell.

An attacker with a expert ability can exploit this cybersecurity weakness.

Solutions for this threat 

Ubuntu: new accountsservice packages.
New packages are available:
  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
  Ubuntu 14.04 ESM: accountsservice 0.6.35-0ubuntu7.3+esm2, libaccountsservice0 0.6.35-0ubuntu7.3+esm2
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