[Secure-testing-team] Bug#579028: pbuilder: installs untrusted packages without asking

[Ansgar Burchardt]

Package: pbuilder
Version: 0.196
Severity: grave
Tags: security
Justification: user security hole

Hi,

pbuilder will by default install packages from untrusted sources.  This
means the system can be compromised by a man in the middle providing
malicious packages.  There also seems no way to get pbuilder to stop
doing so.

pbuilder should (in the default configuration) not install packages that
are not trusted, only when the user explicitly requests this explicitly.

Also when creating the chroot with debootstrap, the --keyring option
should be used so that debootstrap will check for a valid signature.

Regards,
Ansgar

-- System Information:
Debian Release: squeeze/sid
  APT prefers testing
  APT policy: (900, 'testing'), (500, 'unstable'), (1, 'experimental')
Architecture: amd64 (x86_64)

Kernel: Linux 2.6.32-3-amd64 (SMP w/2 CPU cores)
Locale: LANG=C, LC_CTYPE=ja_JP.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash