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Vulnerability of AccountsService: denial of service via Privilege Drop

Synthesis of the vulnerability 

An attacker can trigger a fatal error via Privilege Drop of AccountsService, in order to trigger a denial of service.
Impacted systems: Ubuntu.
Severity of this alert: 1/4.
Creation date: 03/11/2020.
Références of this alert: CVE-2020-16126, USN-4616-1, USN-4616-2, VIGILANCE-VUL-33779.

Description of the vulnerability 

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

Our Vigil@nce team determined that the severity of this computer vulnerability announce 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 announce.

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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