Poptop PPTP BCRELAY fscanf() Buffer Overflow Vulnerability

BID:7590

Info

Poptop PPTP BCRELAY fscanf() Buffer Overflow Vulnerability

Bugtraq ID: 7590
Class: Boundary Condition Error
CVE:
Remote: Yes
Local: No
Published: May 14 2003 12:00AM
Updated: May 14 2003 12:00AM
Credit: The discovery of this vulnerability has been credited to Hernan Otero <[email protected]>.
Vulnerable: PoPToP PPTP Server 1.1.4 -b3
PoPToP PPTP Server 1.1.4 -b2
PoPToP PPTP Server 1.1.4 -b1
Not Vulnerable: PoPToP PPTP Server 1.1.4 -b4

Discussion

Poptop PPTP BCRELAY fscanf() Buffer Overflow Vulnerability

A vulnerability has been discovered in Poptop pptpd-1.1.4 b3 and earlier. The problem occurs due to insufficient bounds checking before calling the fscanf() function. As a result, it may be possible for a malicious attacker to supply excessive data to the program which may trigger memory corruption. This data will be read from a file being accessed by Poptop. As a result, an attacker must have sufficient privileges to construct a file which will be read by Poptop.

Successful exploitation of this issue may allow an attacker to execution arbitrary commands with the privileges of Poptop, typically root.

Exploit / POC

Poptop PPTP BCRELAY fscanf() Buffer Overflow Vulnerability

Currently we are not aware of any exploits for this issue. If you feel we are in error or are aware of more recent information, please mail us at: [email protected] <mailto:[email protected]>.

Solution / Fix

Poptop PPTP BCRELAY fscanf() Buffer Overflow Vulnerability

Solution:
An upgraded version of PoPToP PPTP has been released to address this issue.


PoPToP PPTP Server 1.1.4 -b3

PoPToP PPTP Server 1.1.4 -b1

PoPToP PPTP Server 1.1.4 -b2

References

Poptop PPTP BCRELAY fscanf() Buffer Overflow Vulnerability

References:

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