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Vulnerability of Solaris: privilege escalation via 144751-01 postinstall

Synthesis of the vulnerability 

A local attacker can use the 144751-01 postinstall script, in order to escalate his privileges on Solaris x86.
Impacted products: Solaris, Trusted Solaris.
Severity of this bulletin: 2/4.
Creation date: 09/07/2013.
Références of this threat: BID-61025, VIGILANCE-VUL-13077.

Description of the vulnerability 

The 144751-01/SUNWos86r/install/postinstall script is executed after the installation of 144751-01 on a x86 platform.

This script runs the following command:
  /sbin/sh /tmp/disketterc.d/rcs9.sh "post"

However, if an attacker previously created the /tmp/disketterc.d/rcs9.sh file, it is executed with root privileges.

A local attacker can therefore use the 144751-01 postinstall script, in order to escalate his privileges on Solaris x86.
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This threat note impacts software or systems such as Solaris, Trusted Solaris.

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

The trust level is of type unique source, with an origin of user shell.

A proof of concept or an attack tool is available, so your teams have to process this alert. An attacker with a technician ability can exploit this vulnerability note.

Solutions for this threat 

Solaris: workaround for 144751-01 postinstall.
A workaround is to create the /tmp/disketterc.d/ with mode 0500 (to be added in a startup script):
  mkdir /tmp/disketterc.d
  chown root:root /tmp/disketterc.d
  chmod 0500 /tmp/disketterc.d
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