Date: Fri, 24 May 2013 01:17:40 -0600 From: Kurt Seifried <kseifried@...hat.com> To: oss-security@...ts.openwall.com CC: Timo Sirainen <tss@....fi>, Jan Lieskovsky <jlieskov@...hat.com>, Agostino Sarubbo <ago@...too.org> Subject: Re: CVE request: dovecot : "APPEND" Parameters Processing Denial of Service Vulnerability -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On 05/22/2013 06:24 AM, Timo Sirainen wrote: > 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. Yeah, we can't guarantee that can we. For all we know someone used it in a major deployment/system image/who knows. Please use CVE-2013-2111 for this issue. - -- Kurt Seifried Red Hat Security Response Team (SRT) PGP: 0x5E267993 A90B F995 7350 148F 66BF 7554 160D 4553 5E26 7993 -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.13 (GNU/Linux) iQIcBAEBAgAGBQJRnxQTAAoJEBYNRVNeJnmTtsQP/1iZJ5D8PbeDGeF/Zau/7S2y lOLCOUocf7+b8xjidHqfOS5eQKdqd8gpICCdiOhKUw3pcDp6MTXtfCle+9pOLAwz grZzKBHho1P+WUb/9yfo4zOJHTBMfZHqLj4BSlF5e3rEEZcmAFlxYy0T3uq3Whfx GP80X1snQW5aKtN6LjyaqUN2JUjGCCowtZpmvB0NZlZo5wgJjNx+o+/eGBT9TAEU Q5kt/9QP27ji8EHLrYwJBL/OdxbroqEm3xxnOk0Akwda4DsxgCthNf3mbB4mq9mU uAogsOqwCkwK070zh5ZwEGZkqp9tFOcz/bo06+tb3QNqKwiEKyTS+/qRVpvusF2n NHZ/emqJCmAw54Zp9/rvzR6qr9xEyhXIlbAgXHh+PBLKqSJTmnHp27L0fJIy/iYM di46PJfi3T8SmqEDL/S4rdhPaEcA1nt1233jIp5mYl2inrKBX7sc3a14g7tjDXxC hXaVVAMNDcRfiC4x/s1YMq8CECyeHNLabbwJDL6koujmumQsKaQHdeKjttzOKe43 yQGFeVl2Z9hl1KbrmKy3f8a0BpVUBFJx3NZ+cFP4PliRwKtfzdmeEjIXAFhMcnWW DY+O9UHhFwyeSfC/LVCMYA9GE/ij6cztS+PH20YKN5skos20890wG9iEBukTbpND qVWusXlGRLtFMGAnO5w3 =sWws -----END PGP SIGNATURE-----
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