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Vulnerability of Subversion: denial of service via SHA-1 Collision

Synthesis of the vulnerability 

An attacker can use SHA-1 collisions on Subversion, in order to trigger a denial of service.
Impacted systems: Subversion, Fedora.
Severity of this alert: 2/4.
Creation date: 26/07/2017.
Références of this alert: FEDORA-2017-704c201dbb, FEDORA-2017-b9e4c24094, VIGILANCE-VUL-23357.

Description of the vulnerability 

An attacker can use SHA-1 collisions on Subversion, in order to trigger a denial of service.
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This cybersecurity bulletin impacts software or systems such as Subversion, Fedora.

Our Vigil@nce team determined that the severity of this cybersecurity weakness is medium.

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

An attacker with a expert ability can exploit this computer vulnerability bulletin.

Solutions for this threat 

Subversion: version 1.9.6.
The version 1.9.6 is fixed:
  http://subversion.apache.org/

Subversion: version 1.8.18.
The version 1.8.18 is fixed:
  http://subversion.apache.org/

Fedora: new subversion packages.
New packages are available:
  Fedora 25: subversion 1.9.6-2.fc25
  Fedora 26: subversion 1.9.6-2.fc26
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