Bug 14687
| Summary: | Denial of Service attack on 6.2 | ||
|---|---|---|---|
| Product: | [Retired] Red Hat Linux | Reporter: | Need Real Name <jim> |
| Component: | inetd | Assignee: | Jeff Johnson <jbj> |
| Status: | CLOSED DUPLICATE | QA Contact: | |
| Severity: | medium | Docs Contact: | |
| Priority: | high | ||
| Version: | 6.2 | CC: | jim |
| 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: | 2000-07-26 22:09:56 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: | |||
> Hi, > > I may have discovered a bug in Redhat 6.2 (only) which could be used for > a successful Denial Of Service attack. > > Using the services "time" or "daytime" - which under 6.2 inetd.conf are > both internal services - you can create a tcp connection that remains in > the CLOSE_WAIT state. For example: > > nc host.to.be.attacked.com 37 > > (telnet can also be used) > > will return a binary value and then hang. Hit ^C and repeat. > > Each one of these will leave a tcp connection in the CLOSE_WAIT state on > the attacked host and no tcp connection on the attacking host. > > After doing enough of these you can create enough tcp sessions on the > attacked host so that any further tcp connections are no longer > possible. This seems to only work on 6.2 and also requires time or > daytime to be uncommented in /etc/inetd.conf. > > I cannot find an existing patch for this and I thought it serious enough > to bring to your attention and hopefully have a fast fix created by > Redhat. > > Thanks > > Jim Palfreyman > > Telstra - Networking Tasmania. > >