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USN-316-1: installer vulnerability

13 July 2006

installer vulnerability



Iwan Pieterse discovered that, if you select "Go Back" at the final
message displayed by the alternate or server CD installer ("Installation
complete") and then continue with the installation from the installer's
main menu, the root password is left blank rather than locked. This was
due to an error while clearing out the root password from the
installer's memory to avoid possible information leaks.

Installations from the alternate or server CDs when the user selected
"Continue" when the "Installation complete" message was first displayed
are not affected by this bug. Installations from the desktop CD are not
affected by this bug at all.

When you upgrade your passwd package to the newest version, it will
detect this condition and lock the root password if it was previously
blank. The next point release of Ubuntu 6.06 LTS will include a
corrected installer.

Update instructions

The problem can be corrected by updating your system to the following package versions:

Ubuntu 6.06
  • passwd - 1:4.0.13-7ubuntu3.2

In general, a standard system upgrade is sufficient to effect the
necessary changes.