Bug 1200861

Summary: exim[13769]: segfault at 0 ip b76e08e7 sp bff8c6f0 error 6 in exim[b763b000+11b000]
Product: [Fedora] Fedora Reporter: customercare
Component: eximAssignee: David Woodhouse <dwmw2>
Status: CLOSED EOL QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: high Docs Contact:
Priority: unspecified    
Version: 21CC: graeme_rhbugzilla, security-response-team
Target Milestone: ---   
Target Release: ---   
Hardware: i686   
OS: Unspecified   
Whiteboard:
Fixed In Version: Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2015-12-02 09:58:19 UTC Type: Bug
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:

Description customercare 2015-03-11 14:19:30 UTC
Description of problem:

Exim produces sigfaults ( see below ) . 

I have check three events with the mainlog and not one event seems similar to eachother. The Problem maps at least back before the 10.2. . It started at 11:45 CET. Nothing new got installed on the 10th of Feburary at or before this time.

No clue what it's causing. Could be an attack attempt of some sort.

Version-Release number of selected component (if applicable):

4.84-4

Additional info:

Mar 11 13:45:00 s36 kernel: [  211.111743] exim[3948]: segfault at 0 ip b76e08e7 sp bff8c6f0 error 6 in exim[b763b000+11b000]
Mar 11 13:54:23 s36 kernel: [  774.162207] exim[13199]: segfault at 0 ip b76e08e7 sp bff8c6f0 error 6 in exim[b763b000+11b000]
Mar 11 13:54:23 s36 kernel: exim[13199]: segfault at 0 ip b76e08e7 sp bff8c6f0 error 6 in exim[b763b000+11b000]
Mar 11 13:55:01 s36 kernel: [  811.917703] exim[13524]: segfault at 0 ip b76e08e7 sp bff8c6f0 error 6 in exim[b763b000+11b000]
Mar 11 13:55:01 s36 kernel: exim[13524]: segfault at 0 ip b76e08e7 sp bff8c6f0 error 6 in exim[b763b000+11b000]
Mar 11 13:56:02 s36 kernel: [  872.652687] exim[16159]: segfault at 0 ip b76e08e7 sp bff8c6f0 error 6 in exim[b763b000+11b000]
Mar 11 13:56:02 s36 kernel: exim[16159]: segfault at 0 ip b76e08e7 sp bff8c6f0 error 6 in exim[b763b000+11b000]
Mar 11 13:57:01 s36 kernel: [  931.681357] exim[16734]: segfault at 0 ip b76e08e7 sp bff8c6f0 error 6 in exim[b763b000+11b000]
Mar 11 13:57:01 s36 kernel: exim[16734]: segfault at 0 ip b76e08e7 sp bff8c6f0 error 6 in exim[b763b000+11b000]
Mar 11 14:05:02 s36 kernel: [ 1412.874891] exim[23611]: segfault at 0 ip b76e08e7 sp bff8c6f0 error 6 in exim[b763b000+11b000]
Mar 11 14:05:02 s36 kernel: exim[23611]: segfault at 0 ip b76e08e7 sp bff8c6f0 error 6 in exim[b763b000+11b000]
Mar 11 14:07:51 s36 kernel: [ 1582.158468] exim[27476]: segfault at 0 ip b76e08e7 sp bff8c6f0 error 6 in exim[b763b000+11b000]
Mar 11 14:07:51 s36 kernel: exim[27476]: segfault at 0 ip b76e08e7 sp bff8c6f0 error 6 in exim[b763b000+11b000]
Mar 11 14:08:46 s36 kernel: [ 1636.733814] exim[28176]: segfault at 0 ip b76e08e7 sp bff8c6f0 error 6 in exim[b763b000+11b000]
Mar 11 14:08:46 s36 kernel: exim[28176]: segfault at 0 ip b76e08e7 sp bff8c6f0 error 6 in exim[b763b000+11b000]
Mar 11 14:14:09 s36 kernel: [ 1960.248858] exim[663]: segfault at 0 ip b76e08e7 sp bff8c6f0 error 6 in exim[b763b000+11b000]
Mar 11 14:14:09 s36 kernel: exim[663]: segfault at 0 ip b76e08e7 sp bff8c6f0 error 6 in exim[b763b000+11b000]
Mar 11 14:15:03 s36 kernel: [ 2013.553811] exim[2150]: segfault at 0 ip b76e08e7 sp bff8c6f0 error 6 in exim[b763b000+11b000]
Mar 11 14:15:03 s36 kernel: exim[2150]: segfault at 0 ip b76e08e7 sp bff8c6f0 error 6 in exim[b763b000+11b000]
Mar 11 14:22:50 s36 kernel: [ 2481.257786] exim[10038]: segfault at 0 ip b76e08e7 sp bff8c6f0 error 6 in exim[b763b000+11b000]
Mar 11 14:22:50 s36 kernel: exim[10038]: segfault at 0 ip b76e08e7 sp bff8c6f0 error 6 in exim[b763b000+11b000]
Mar 11 14:24:06 s36 kernel: [ 2557.029639] exim[10680]: segfault at 0 ip b76e08e7 sp bff8c6f0 error 6 in exim[b763b000+11b000]
Mar 11 14:24:06 s36 kernel: exim[10680]: segfault at 0 ip b76e08e7 sp bff8c6f0 error 6 in exim[b763b000+11b000]
Mar 11 14:25:04 s36 kernel: [ 2614.407384] exim[12331]: segfault at 0 ip b76e08e7 sp bff8c6f0 error 6 in exim[b763b000+11b000]
Mar 11 14:25:04 s36 kernel: exim[12331]: segfault at 0 ip b76e08e7 sp bff8c6f0 error 6 in exim[b763b000+11b000]
Mar 11 14:25:36 s36 kernel: [ 2646.612916] exim[13196]: segfault at 0 ip b76e08e7 sp bff8c6f0 error 6 in exim[b763b000+11b000]
Mar 11 14:25:36 s36 kernel: exim[13196]: segfault at 0 ip b76e08e7 sp bff8c6f0 error 6 in exim[b763b000+11b000]
Mar 11 14:29:08 s36 kernel: [ 2858.453590] exim[15232]: segfault at 0 ip b76e08e7 sp bff8c6f0 error 6 in exim[b763b000+11b000]
Mar 11 14:29:08 s36 kernel: exim[15232]: segfault at 0 ip b76e08e7 sp bff8c6f0 error 6 in exim[b763b000+11b000]
Mar 11 14:35:05 s36 kernel: [ 3215.615426] exim[22299]: segfault at 0 ip b76e08e7 sp bff8c6f0 error 6 in exim[b763b000+11b000]
Mar 11 14:35:05 s36 kernel: exim[22299]: segfault at 0 ip b76e08e7 sp bff8c6f0 error 6 in exim[b763b000+11b000]
Mar 11 14:40:52 s36 kernel: [ 3563.206414] exim[28587]: segfault at 0 ip b76e08e7 sp bff8c6f0 error 6 in exim[b763b000+11b000]
Mar 11 14:40:52 s36 kernel: exim[28587]: segfault at 0 ip b76e08e7 sp bff8c6f0 error 6 in exim[b763b000+11b000]
Mar 11 14:41:12 s36 kernel: [ 3582.810356] exim[28829]: segfault at 0 ip b76e08e7 sp bff8c6f0 error 6 in exim[b763b000+11b000]
Mar 11 14:41:12 s36 kernel: exim[28829]: segfault at 0 ip b76e08e7 sp bff8c6f0 error 6 in exim[b763b000+11b000]
Mar 11 14:45:06 s36 kernel: [ 3816.528815] exim[352]: segfault at 0 ip b76e08e7 sp bff8c6f0 error 6 in exim[b763b000+11b000]
Mar 11 14:45:06 s36 kernel: exim[352]: segfault at 0 ip b76e08e7 sp bff8c6f0 error 6 in exim[b763b000+11b000]
Mar 11 14:47:25 s36 kernel: [ 3956.222177] exim[2421]: segfault at 0 ip b76e08e7 sp bff8c6f0 error 6 in exim[b763b000+11b000]
Mar 11 14:47:25 s36 kernel: exim[2421]: segfault at 0 ip b76e08e7 sp bff8c6f0 error 6 in exim[b763b000+11b000]
Mar 11 14:55:06 s36 kernel: [ 4417.244660] exim[10909]: segfault at 0 ip b76e08e7 sp bff8c6f0 error 6 in exim[b763b000+11b000]
Mar 11 14:55:06 s36 kernel: exim[10909]: segfault at 0 ip b76e08e7 sp bff8c6f0 error 6 in exim[b763b000+11b000]
Mar 11 14:58:41 s36 kernel: [ 4632.172463] exim[13404]: segfault at 0 ip b76e08e7 sp bff8c6f0 error 6 in exim[b763b000+11b000]
Mar 11 14:58:41 s36 kernel: exim[13404]: segfault at 0 ip b76e08e7 sp bff8c6f0 error 6 in exim[b763b000+11b000]
Mar 11 14:59:14 s36 kernel: [ 4665.139384] exim[13769]: segfault at 0 ip b76e08e7 sp bff8c6f0 error 6 in exim[b763b000+11b000]
Mar 11 14:59:14 s36 kernel: exim[13769]: segfault at 0 ip b76e08e7 sp bff8c6f0 error 6 in exim[b763b000+11b000]


Exim Mainlog for a few events: 

2015-03-09 14:55:06 1YUy9C-00014v-05 H=mout.kundenserver.de [212.227.126.130] Warning: send for >EMAILADDRESS<


2015-03-09 14:58:41 no host name found for IP address 190.255.210.11


2015-03-08 14:59:14 H=laubervilliers-656-1-236-113.w193-248.abo.wanadoo.fr [193.248.33.113] F=<eruptionvv1osd> rejected RCPT <>EMAILADDRESS<>: you have been blacklisted.
2015-03-09 14:59:14 H=host71-87-static.107-82-b.business.telecomitalia.it (alicegate.homenet.telecomitalia.it) [82.107.87.71] F=<paul> rejected RCPT <>EMAILADDRESS<>: you have been blacklisted.
2015-03-11 14:59:14 1YVhAF-0003Z6-0O SMTP error from remote mail server after RCPT TO:<xteam>: host mx.t-online.hu [84.2.46.11]: 451 4.2.0 <>EMAILADDRESS<>: Recipient address rejected: You are greylisted for 600 seconds (see http://cgi.t-online.hu/bra02/mxtest.cgi?err=GRYLST for details)
2015-03-11 14:59:14 1YVhAH-0003Zk-L5 => /mailacct/joymacommail10/Maildir/ (>EMAILADDRESS<) <>EMAILADDRESS<> R=virtual_user T=address_directory
2015-03-11 14:59:14 1YVhAH-0003Zk-L5 Completed

Comment 1 customercare 2015-03-11 15:14:16 UTC
- the ip is not running on the system.
- the ip is invalid in term of read left to right
- read from right to left, it's a multicast ip.
- server does not get multicasts or tcpdump isn't showing them.

Comment 2 Fabio Olive Leite 2015-03-16 20:28:42 UTC
This does not look like an attack to me. The EIP and ESP are always the same in all crashes, so it looks like something is retrying to send the same data over and over. Perhaps capturing the traffic to the server that leads to these segfaults would be a good step forward in understanding these crashes.

I'll remove the Security keyword now and let's treat this as a normal bug in Fedora. Please work with the exim maintainer to get help.

Comment 3 Graeme Fowler 2015-03-25 20:44:23 UTC
This is being tracked in upstream bug tracker as http://bugs.exim.org/show_bug.cgi?id=1601

It is highly likely related to http://bugs.exim.org/show_bug.cgi?id=1558 which is already fixed and will be in next release.

OP has not responded to comments on that bug, it'd be helpful if they could.

Comment 4 Fedora End Of Life 2015-11-04 12:56:52 UTC
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Comment 5 Fedora End Of Life 2015-12-02 09:58:24 UTC
Fedora 21 changed to end-of-life (EOL) status on 2015-12-01. Fedora 21 is
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