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Vulnerability of Python typed_ast: out-of-bounds memory reading via handle_keywordonly_args

Synthesis of the vulnerability 

An attacker can force a read at an invalid address via handle_keywordonly_args of Python typed_ast, in order to trigger a denial of service, or to obtain sensitive information.
Vulnerable software: Fedora, openSUSE Leap, SLES.
Severity of this announce: 2/4.
Creation date: 16/03/2020.
Références of this computer vulnerability: CVE-2019-19274, FEDORA-2020-9b3dabc21c, openSUSE-SU-2020:0567-1, openSUSE-SU-2020:0609-1, VIGILANCE-VUL-31789.

Description of the vulnerability 

An attacker can force a read at an invalid address via handle_keywordonly_args of Python typed_ast, in order to trigger a denial of service, or to obtain sensitive information.
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This security weakness impacts software or systems such as Fedora, openSUSE Leap, SLES.

Our Vigil@nce team determined that the severity of this threat bulletin is medium.

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

An attacker with a expert ability can exploit this threat.

Solutions for this threat 

Fedora 30: new python3-typed_ast packages.
New packages are available:
  Fedora 30: python3-typed_ast 1.4.0-2.fc30

openSUSE Leap 15.1: new python-typed-ast packages.
New packages are available:
  openSUSE Leap 15.1: python-typed-ast 1.3.1-lp151.2.6.1

SUSE LE 15 SP1: new python3-typed-ast packages.
New packages are available:
  SUSE LE 15 SP1: python3-typed-ast 1.3.1-bp151.2.6.1
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