ProFTPD USER Remote Denial of Service Vulnerability

BID:2366

Info

ProFTPD USER Remote Denial of Service Vulnerability

Bugtraq ID: 2366
Class: Design Error
CVE:
Remote: Yes
Local: Yes
Published: Dec 19 2000 12:00AM
Updated: Dec 19 2000 12:00AM
Credit: Reported by Wojciech Purczynski <[email protected]>
Vulnerable: ProFTPD Project ProFTPD 1.2 pre9
ProFTPD Project ProFTPD 1.2 pre8
ProFTPD Project ProFTPD 1.2 pre7
ProFTPD Project ProFTPD 1.2 pre6
ProFTPD Project ProFTPD 1.2 pre5
ProFTPD Project ProFTPD 1.2 pre4
ProFTPD Project ProFTPD 1.2 pre3
ProFTPD Project ProFTPD 1.2 pre2
ProFTPD Project ProFTPD 1.2 pre11
ProFTPD Project ProFTPD 1.2 pre10
Not Vulnerable:

Discussion

ProFTPD USER Remote Denial of Service Vulnerability

A memory leak has been reported in all versions of ProFTPd.

The USER FTP command causes the server to misallocate and leak small amounts of memory each time the command is executed.

If a sufficient number of these commands are executed by the server, substantial amounts of system memory can be consumed, allowing a remote attacker to carry out a denial of service attack on the affected host.

This could be problematic if anonymous FTP is enabled or if a malicious local user has been supplied with an FTP login ID.

Exploit / POC

ProFTPD USER Remote Denial of Service Vulnerability

Currently the SecurityFocus staff 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

ProFTPD USER Remote Denial of Service Vulnerability

Solution:
This vulnerablity is thought to exist in all previous 1.2.0 test releases, (1.2.0pre[1-10], 1.2.0rc[1-2]). All three now have been fixed, and patches have been committed to the ProFTPD CVS repository. A new release, 1.2.0rc3, containing these fixes has been made available as of 5 February and is
available from:

http://www.proftpd.org/download.html
ftp://ftp.proftpd.org/distrib/proftpd-1.2.0rc3.tar.gz

Instructions for accessing the CVS repository via Anonymous CVS are available at:

http://www.proftpd.org/docs/cvs.html


ProFTPD Project ProFTPD 1.2 pre3

ProFTPD Project ProFTPD 1.2 pre2

ProFTPD Project ProFTPD 1.2 pre9

ProFTPD Project ProFTPD 1.2 pre4

ProFTPD Project ProFTPD 1.2 pre5

ProFTPD Project ProFTPD 1.2 pre8

ProFTPD Project ProFTPD 1.2 pre11

ProFTPD Project ProFTPD 1.2 pre7

ProFTPD Project ProFTPD 1.2 pre6

ProFTPD Project ProFTPD 1.2 pre10

References

ProFTPD USER Remote Denial of Service Vulnerability

References:
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