sudo segmentation fault when using pam_fprint

[Ronny Ager-Wick]

Binary package hint: sudo

Ubuntu Hardy 8.04.1 (2.6.24-19-generic #1 SMP Fri Jul 11 21:01:46 UTC 2008 x86_64 GNU/Linux)
Current version of Sudo: 1.6.9p10-1ubuntu3.2

This bug was discovered with the use of pam_fprint (fingerprint authentication module, see http://reactivated.net/fprint/wiki/Pam_fprint) in /etc/pam.d/common-auth, but a similar issue (http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=462445) which does not include the same module was solved in Debian's unstable branch so I gave the solution a try and it worked.
After installing pam_fprint and testing and enlisting fingers via fprint_demo, I edited /etc/pam.d/common-auth to include the following:
# this enables the fingerprint reader
auth sufficient pam_fprint.so

# original:
# auth requisite pam_unix.so nullok_secure

# modifed so fingerprint reader is sufficient without password
auth sufficient pam_unix.so nullok_secure

At first use, it works fine (*What happened*):
$ sudo nano /etc/pam.d/common-auth
Scan right little finger on AuthenTec AES2501

Then, the second time, the bug appears:
$ sudo nano /etc/pam.d/common-auth
Segmentation fault

$

Note that if using standard password authentication, you will not be asked for password at this time as the sudo session has not timed out yet. When the sudo session has timed out, or if I use "sudo -k" to induce timeout, it works fine again - the first time - as demonstrated above.

According to the Debian bug report mentioned above, the bug is fixed in version: 1.6.9p15
I installed the latest version found here: http://packages.debian.org/sid/amd64/sudo/download
Sudo version is now: 1.6.9p17-1

It now works as expected (*What I expected to happen in the first place*):
$ sudo nano /etc/pam.d/common-auth
Scan right little finger on AuthenTec AES2501

$ sudo nano /etc/pam.d/common-auth
Scan right little finger on AuthenTec AES2501

$

My request here is merely for this later version of sudo to be included in hardy-updates or the backports repositories of Ubuntu.

[Patrik Kullman (nomego)]

I can just confirm this, wouldn't have solved it as fast without this bugreport - thanks!

[Sebastian Schulze (bascht)]

Thank you! saved me probably a couple of hours. :)

[graingert (tagrain)]

confirmed