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Vulnerability of patch: code shell command injection in ed scripts

Synthesis of the vulnerability 

An attacker can inject shell command in patches using the ed format, thanks to escapes via the "!" ed command.
Impacted products: RHEL.
Severity of this bulletin: 2/4.
Creation date: 19/09/2019.
Références of this threat: CERTFR-2019-AVI-451, CVE-2018-20969, RHSA-2019:2798-01, RHSA-2019:2964-01, RHSA-2019:3757-01, RHSA-2019:3758-01, RHSA-2019:4061-01, VIGILANCE-VUL-30363.

Description of the vulnerability 

An attacker can inject shell command in patches using the ed format, thanks to escapes via the "!" ed command.
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This computer weakness alert impacts software or systems such as RHEL.

Our Vigil@nce team determined that the severity of this weakness note 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 weakness bulletin.

Solutions for this threat 

RHEL 7.4: new patch packages.
New packages are available:
  RHEL 7.4: patch 2.7.1-11.el7_4

RHEL 7.7: new patch packages.
New packages are available:
  RHEL 7: patch 2.7.1-12.el7_7

RHEL 8.0: new patch packages.
New packages are available:
  RHEL 8: patch 2.7.6-9.el8_0

Wind River Linux: version 10.19.45.4.
The version 10.19.45.4 is fixed:
  https://support2.windriver.com/
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