Roaring Penguin PPPoE Denial of Service Vulnerability

BID:2098

Info

Roaring Penguin PPPoE Denial of Service Vulnerability

Bugtraq ID: 2098
Class: Failure to Handle Exceptional Conditions
CVE:
Remote: Yes
Local: No
Published: Dec 11 2000 12:00AM
Updated: Dec 11 2000 12:00AM
Credit: Discovered by Robert Schlabbach. Posted to Bugtraq with fix information by David F. Skoll <[email protected]> on Dec 11, 2000.
Vulnerable: Roaring Penguin Software PPPoE 2.4
Roaring Penguin Software PPPoE 2.3
Roaring Penguin Software PPPoE 2.2
Roaring Penguin Software PPPoE 2.1
Roaring Penguin Software PPPoE 2.0
Redhat Linux 7.0
Not Vulnerable: Roaring Penguin Software PPPoE 2.5.1
Roaring Penguin Software PPPoE 2.5

Discussion

Roaring Penguin PPPoE Denial of Service Vulnerability

Roaring Penguin Software's PPPoE is a freeware PPP over Ethernet client often used by ADSL subscribers running Linux or NetBSD.

PPPoE contains a possibly remotely exploitable denial of service vulnerability in its handling of TCP packets when the Clamp_MSS option is used. If PPPoE recieves a malformed TCP packet with a "zero-length option", PPPoE will go into an infinite loop. As a result, the ppp connection being supported by PPPoE will time out and be terminated. A manual re-start is needed to regain functionality.

This bug has been fixed by Roaring Penguin Software in a new version, see the solutions section.

Exploit / POC

Roaring Penguin PPPoE Denial of Service Vulnerability

The following exploit is available:

Solution / Fix

Roaring Penguin PPPoE Denial of Service Vulnerability

Solution:
Upgrade to version 2.5 or higher.

Conectiva has released updates to correct the vulnerability in the version of rp-pppoe shipped with their systems.

Redhat has released an advisory (RHSA-2000:130-05) and fixes to address this vulnerability. Please see the referenced advisory for further information.


Roaring Penguin Software PPPoE 2.0

Roaring Penguin Software PPPoE 2.1

Roaring Penguin Software PPPoE 2.2

Roaring Penguin Software PPPoE 2.3

Roaring Penguin Software PPPoE 2.4

References

Roaring Penguin PPPoE Denial of Service Vulnerability

References:
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