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Vulnerability of Open Build Service: privilege escalation via rpmbuild

Synthesis of the vulnerability 

An attacker can bypass restrictions via rpmbuild of Open Build Service, in order to escalate his privileges.
Impacted products: Fedora, openSUSE Leap, SUSE Linux Enterprise Desktop, SLES.
Severity of this bulletin: 2/4.
Creation date: 11/12/2017.
Références of this threat: CVE-2017-9274, FEDORA-2018-903354c26c, FEDORA-2018-ac8aab1f7a, openSUSE-SU-2017:3259-1, SUSE-SU-2017:3253-1, SUSE-SU-2018:0065-1, VIGILANCE-VUL-24711.

Description of the vulnerability 

An attacker can bypass restrictions via rpmbuild of Open Build Service, in order to escalate his privileges.
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This computer threat bulletin impacts software or systems such as Fedora, openSUSE Leap, SUSE Linux Enterprise Desktop, SLES.

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

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 computer vulnerability alert.

Solutions for this threat 

Fedora: new osc packages.
New packages are available:
  Fedora 26: osc 0.162.1-230.1.1.fc26
  Fedora 27: osc 0.162.1-230.1.1.fc27

Fedora: new osc-source_validator packages.
New packages are available:
  Fedora 26: osc-source_validator 0.10-1.fc26
  Fedora 27: osc-source_validator 0.10-1.fc27

openSUSE Leap: new build packages.
New packages are available:
  openSUSE Leap 42.2: build 20171128-2.6.1
  openSUSE Leap 42.3: build 20171128-5.1

SUSE LE 11 SP4: new osc packages.
New packages are available:
  SUSE LE 11 SP4: osc 0.162.1-7.4.1

SUSE LE 12: new build packages.
New packages are available:
  SUSE LE 12 SP2: build 20171128-9.3.2
  SUSE LE 12 SP3: build 20171128-9.3.2
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Vigil@nce provides networks vulnerabilities alerts. The Vigil@nce team tracks computer vulnerabilities impacting systems and applications.