pptp crashed with SIGSEGV on login

[kapetr]

On every boot of U12.04 I get window with: +- "Problem with system program"
I have to (?) enter root password -> then bug report is generated.

I have configured 2 PPTP VPNs in NM - but without automatic run.
After I defined them i had test them successful - but now is running of VPN in NM not accessible.

ProblemType: Crash
DistroRelease: Ubuntu 12.04
Package: pptp-linux 1.7.2-6
ProcVersionSignature: Ubuntu 3.2.0-22.35-generic 3.2.14
Uname: Linux 3.2.0-22-generic x86_64
ApportVersion: 2.0-0ubuntu4
Architecture: amd64
Date: Sat Apr 7 16:16:23 2012
ExecutablePath: /usr/sbin/pptp
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Beta amd64 (20120401)
ProcCmdline: /usr/sbin/pptp 69.61.14.2 --nolaunchpppd --loglevel 0 --logstring nm-pptp-service-2582
ProcEnviron:
 TERM=linux
 PATH=(custom, no user)
 LANG=cs_CZ.UTF-8
SegvReason: reading unknown VMA
Signal: 11
SourcePackage: pptp-linux
StacktraceTop:
 ?? ()
 ?? ()
 ?? ()
 ?? ()
 ?? ()
Title: pptp crashed with SIGSEGV
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups:

[kapetr (kapetr)]

What I am wondering about is - WHY is the command /usr/sbin/pptp 69.61.14.2 --nolaunchpppd --loglevel 0 --logstring nm-pptp-service-2582 executed at all ?!

The IP 69.61.14.2 belongs to the one VPN defined in NM - but as I wrote: it is not configured to be run automatically.

[kapetr (kapetr)]

Can this not be a security problem if something (NM ?) tries to open VPN tunnel without asking for it ?

I'm marking this bug as security vulnerability - if it is not a security problem (I don't understand it) then tell me and I will clear this flag again.

Thanks.

[kapetr (kapetr)]

Note: after $ sudo killall NetworkManager

the NM comes up again, but now with VPN in menu (and working).
That mean - only on boot/login is the problem.

[kapetr (kapetr)]

... some comment would be helpful <jdstrand> :-/

If something redirect all network flow without asking, without be configured to do so ...
... if such thing is not a security issue, what then ?

BTW - after next updates the problem is disappeared - but maybe is it while all my VPNs are now set not for all users:
https://bugs.launchpad.net/ubuntu/+source/network-manager/+bug/963106/comments/6

[Marc Deslauriers (mdeslaur)]

Thanks for taking the time to report this bug and helping to make Ubuntu better. We appreciate the difficulties you are facing, but this appears to be a "regular" (non-security) bug. I have unmarked it as a security issue since this bug does not show evidence of allowing attackers to cross privilege boundaries nor directly cause loss of data/privacy. Please feel free to report any other bugs you may find.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[stakasha (d-v-razumov)]

This bug also affects Ubuntu 13.10, 32bit.