Messages in this thread | | | Date | Fri, 24 Mar 2000 16:26:13 -0800 (PST) | From | Blu3Viper <> | Subject | Re: Update: Subtle data corruption of TCP streams |
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How about taking this to linux-kernel for discussion since it appears to be a development kernel bug possibly?
-d
On Fri, 24 Mar 2000, Wietse Venema wrote:
> Date: Fri, 24 Mar 2000 10:38:36 -0500 > From: Wietse Venema <wietse@PORCUPINE.ORG> > To: BUGTRAQ@SECURITYFOCUS.COM > Subject: Update: Subtle data corruption of TCP streams > > Apparently, once instance of this data corruption problem is caused > by an unnamed bandwidth management system. It runs as a bridge, > and does not show up in traceroute etc. output. We were able to > estimate its location (at 5 ms round-trip time from one endpoint) > by analyzing packet arrival times. > > Until now, this TCP data corruption problem has been observed only > when one of the connection endpoints runs a recent LINUX version. > Sightings have been reported by sites in Germany and in France. > > Only recent LINUX versions request the use of timestamp options > that cause the tell-tale patterns of "01 01 08 0a" in TCP packets, > and that end up being regurgitated as ^A^A^H^J data. > > I have updated the analysis at ftp://ftp.porcupine.org/pub/debugging/ > > Wietse > > Wietse Venema: > > This note is about a subtle data corruption problem with TCP data > > streams that may bite people as more and more (LINUX) systems are > > sending network traffic with TCP-level options turned on. > > > > Last week, several Postfix users reported mail delivery failures > > because sequences of control characters (for example, ^A^A^H) were > > being inserted into their SMTP connections, resulting in SMTP > > protocol errors and non-delivery of email. > > > > These data corruption problems are not host specific: they are > > observed with both Linux and BSD/OS systems, and with mail sent to > > and/or received from systems running Postfix, Sendmail and qmail. > > > > Over the weekend of March 18, 2000, a few people left tcpdump > > running on their machines, in order to record some of these corrupted > > SMTP sessions. This note is based on an analysis of that data. >
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