Date: Wed, 22 May 2013 15:24:59 +0300 From: Timo Sirainen <tss@....fi> To: Jan Lieskovsky <jlieskov@...hat.com> Cc: Agostino Sarubbo <ago@...too.org>, oss-security@...ts.openwall.com Subject: Re: CVE request: dovecot : "APPEND" Parameters Processing Denial of Service Vulnerability On 22.5.2013, at 15.17, Jan Lieskovsky <jlieskov@...hat.com> wrote: > ----- Original Message ----- >> From: "Agostino Sarubbo" <ago@...too.org> >> To: oss-security@...ts.openwall.com >> Sent: Tuesday, May 21, 2013 8:58:04 PM >> Subject: [oss-security] CVE request: dovecot : "APPEND" Parameters Processing Denial of Service Vulnerability >> >> From the secunia advisory SA53492 : >> >> Description >> A vulnerability has been reported in Dovecot, which can be exploited by >> malicious users to cause a DoS (Denial of Service). >> >> The vulnerability is caused due to an error within IMAP functionality when >> processing the "APPEND" parameters and can be exploited to cause a hang. > > Timo, in relation with the previous (similar) one (thanks to Tomas Hoger for > pointing out): >  http://thread.gmane.org/gmane.comp.security.oss.general/8916/focus=8934 >  http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=695138#15 > > this time the CVE identifier should be allocated / issue is valid, right? > > While in the former ,  case just the connection for the user issuing > the command would crash, this time (assuming) either whole dovecot daemon > might hang or even if the whole daemon wouldn't hang (and request is handled > within a thread), that request would made the particular thread to consume > excessive amount of CPU due to infinite loop, right? A logged in user can cause his own IMAP connection process to eat 100% CPU, so it won't immediately hang other users. By default users can log in max. 10 times from the same IP, so attacker requires many IPs to cause a real DoS. And of course a valid user account, which means it will be immediately visible to admin who is causing the system to slow down. > Timo, can you confirm / disprove a CVE identifier should be assigned to this? I'm not against it, but I don't see this as that big of an issue, especially with v2.2 still not being widely used. > Thank you && Regards, Jan. > -- > Jan iankko Lieskovsky / Red Hat Security Response Team > >> >> The vulnerability is reported in version 2.2. >> >> >> Solution >> Update to version 2.2.2. >> >> Provided and/or discovered by >> Reported by the vendor. >> >> Original Advisory >> http://www.dovecot.org/list/dovecot-news/2013-May/000255.html >> >> Commit: >> http://hg.dovecot.org/dovecot-2.2/rev/ea0390e1789f >> >> : https://secunia.com/advisories/53492/ >> >> -- >> Agostino Sarubbo >> Gentoo Linux Developer >> >
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