[Dovecot] Security issue #5: mail_extra_groups setting is often used insecurely

[Karsten Bräckelmann]

On Wed, 2008-03-05 at 00:29 +0200, Timo Sirainen wrote:

> > > a) Upgrade to v1.0.11 and use the new mail_privileged_group setting
> > > instead of mail_extra_groups.
> > 
> > We tried this but now the mail.log has a number of lines :
> > « dovecot: IMAP(someuser): open(/var/mail/.temp.XXXX) failed: Permission 
> > denied »
> 
> Oh, this is actually harmless. You can get rid of it (and improve the
> performance) by setting dotlock_use_excl=yes.
> 
> But maybe I should release v1.0.12 anyway with that error message
> silenced..

You mean seeing that error message only is actually not an error,
because the next locking method just works?

In that case, great -- I'll go change dotlock_use_excl, revert the scary
option (b) of chmod world-writable, and see how it works out. Not using
NFS anyway.

  guenther


-- 
char *t="\10pse\0r\0dtu\0. at ghno\x4e\xc8\x79\xf4\xab\x51\x8a\x10\xf4\xf4\xc4";
main(){ char h,m=h=*t++,*x=t+2*h,c,i,l=*x,s=0; for (i=0;i<l;i++){ i%8? c<<=1:
(c=*++x); c&128 && (s+=h); if (!(h>>=1)||!t[s+h]){ putchar(t[s]);h=m;s=0; }}}