Bug 9880

Summary:	After many connection from UNKNOW - POP3 Hangs
Product:	[Retired] Red Hat Linux	Reporter:	buggy <bugzilla>
Component:	imap	Assignee:	Nalin Dahyabhai <nalin>
Status:	CLOSED NOTABUG	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	7.0	CC:	yiango
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	i386
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2000-08-09 02:28:38 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description buggy 2000-03-01 08:09:16 UTC

My Log files show the following for the ipop3d damon:
Mar  1 09:09:40 ns1 ipop3d[2491]: port 110 service init from UNKNOWN
Mar  1 04:09:42 ns1 ipop3d[2492]: warning: can't get client address:
Connection reset by peer
Mar  1 04:09:42 ns1 ipop3d[2492]: connect from unknown
Mar  1 09:09:42 ns1 ipop3d[2492]: port 110 service init from UNKNOWN
Mar  1 04:09:42 ns1 ipop3d[2493]: warning: can't get client address:
Connection reset by peer
Mar  1 04:09:42 ns1 ipop3d[2493]: connect from unknown
Mar  1 09:09:42 ns1 ipop3d[2493]: port 110 service init from UNKNOWN
After many of these connections (DoS 40 sec) the service hangs.
The upgrade to the rpm imap-4.5-0.5.2 but that doesent matter....

Thank you for any help! (I hope I can get my mails....)

Comment 1 Cristian Gafton 2000-08-09 02:28:36 UTC

assigned to the new owner

Comment 2 Alan Cox 2000-08-18 17:12:24 UTC

inetd turns off services for a while that are rapidly respawning. So this seems
sane. You can
alter the amount of respawning needed via the wait parameter in inetd.conf

Comment 3 Rick Richardson 2000-09-02 18:09:10 UTC

I don't know about this answer.  I think this bug ishould be open and
outstanding, and should be raised to the highest severity level.

With the pinstripe beta (RH 6.9), all it takes is a single telnet to the POP3
server from "unknown" and inetd goes crazy respawning pop3d.  The syslog fills
up with messages and the machine eventually dies.  I verified this on my own
machine.  This did not happen with RH 6.2.

I had to disable pop3d in RH 6.9 because all it took was one idiot doing a port
probe to cause this bug.