Date: Sat, 18 May 2013 14:55:57 -0600 From: Kurt Seifried <kseifried@...hat.com> To: oss-security@...ts.openwall.com CC: Gilles Chehade <gilles@...lp.org>, "Jason A. Donenfeld" <Jason@...c4.com>, misc@...nsmtpd.org Subject: Re: Re: CVE Request: DoS in OpenSMTPD TLS Support -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On 05/18/2013 10:16 AM, Gilles Chehade wrote: > Erf... > > Not too nice to send a CVE request without ANY coordination with us > ... > > Just for the record, you contacted us today reporting a bug which > could be memory corruption and you didn't know if it could be > exploited. Then I replied telling you that we discovered and fixed > the bug two days ago and I then explained to you what the bug > really was (wrong logic in the IO events handling code in our SSL > layer). I then told you that we made snapshots with the fix applied > AND that we has planned for a release on *Monday* with the fixes > backported. > > The snapshot mail, commit log and diffs makes the issue obvious, I > just don't understand why you had to go and publish *RIGHT AWAY* a > script on public lists after our mail exchange... > > I'm not mad that you disclosed a bug, we're very open about it, and > the git history is full of references to crash and security fixes, > but it's just REALLY not nice how you handled this and are forcing > me to do this release in a hurry rather than handling it with > package maintainers. > > Next time, please coordinate a little, just to be nice. > > > On Sat, May 18, 2013 at 04:27:22PM +0200, Jason A. Donenfeld > wrote: >> Hi Kurt, >> >> The SSL handling in the latest OpenSMTPD (5.3.1) misconfigures >> its sockets in blocking mode, allowing an attacker to prevent all >> mail delivery simply by holding a socket open. >> >> I discovered this accidentally, as I noticed my HP printer's >> smtp client would keep the connection indefinitely open after an >> unsuccessful authentication attempt, causing no more mail to be >> delivered until I SIGKILL'd my smtpd process or unplugged my >> printer. >> >> The following reproduces the attack trivially: >> >> #!/usr/bin/env python2 import smtplib import time print "[+] >> Connecting to server and initiating TLS" smtp = >> smtplib.SMTP("mail.some-vitim-host.blah", 587) smtp.starttls() >> print "[+] No clients will be able to connect as long as this >> remains open." time.sleep(100000000) >> >> Apparently this was fixed recently upstream, noting "evil client" >> in the commit message: >> http://git.zx2c4.com/OpenSMTPD/commit/?id=38b26921bad5fe24ad747bf9d591330d683728b0 >> >> >> A snapshot has been posted to http://www.opensmtpd.org/archives/ , but >> no patch release has yet been made. >> >> Jason Please use CVE-2013-2125 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) iQIcBAEBAgAGBQJRl+rdAAoJEBYNRVNeJnmT/qQP/0/CZGz8BVlVcwB4mubepywJ L94gzRPt5fbVr3a9gbXbV8tv5lAmYIHemH5KSp3fJF8e3OSPVATGNUnovgNFceFv naAhAca3lhtXlOepgGdEoC/AjMwIYdxBhgH8/GtfEv5UdOWpOno2Yqf1Mk4nSduN MuKJ1hOCoSELUEvkAC5eSNF+lwv3AaD8TZeWyRWlU8uzRXi1G+cD7z+3cKIP8I8u wJze/qSiNmdkRRABB4L7wi7lCPxNO40ZRyZe5HOus6l3no4IUycn3i28xEawvOGX wwChCpVmiysCxZZMRtFSrvx4FqiopbHgdlKyFP8S7TWEwslfvjvuFE2d716iSacs M46lG4RU4BrBENFvZHMHrgOKcmVEpoFpICQoFrfjXpcMQSTNtrnyK/oJyboCPkSo EXQCVz1V0lJ8lwUAmsEXp+l/TFxzNGlDeQe5pvpo6bSBIv/xHYhaz66lo1D6kfUN Rol0zr2nkLjIDemD+aeaZ2IeuaXkZ3mgAK+TdIHgglwNiUCYZKuuad0T7wBcoEaz Rnqiudnk5LXl03XqZfUB1zTG4Mp8F90L5x962oQ8fHKqIAPUdDHXJer4+XPF13iw blzr5AxapPh/DlQUH7HOdEs83y05VaBAI7/HW5Ma8oUpmo9RhlWmYpJth5hq/RcQ TxYSatIJAOoUeGUPcALn =9aga -----END PGP SIGNATURE-----
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