CVE Vulnerabilities

CVE-2011-0762

Uncontrolled Resource Consumption

Published: Mar 02, 2011 | Modified: Apr 11, 2025
CVSS 3.x
N/A
Source:
NVD
CVSS 2.x
4 MEDIUM
AV:N/AC:L/Au:S/C:N/I:N/A:P
RedHat/V2
5 IMPORTANT
AV:N/AC:L/Au:N/C:N/I:N/A:P
RedHat/V3
Ubuntu
MEDIUM

The vsf_filename_passes_filter function in ls.c in vsftpd before 2.3.3 allows remote authenticated users to cause a denial of service (CPU consumption and process slot exhaustion) via crafted glob expressions in STAT commands in multiple FTP sessions, a different vulnerability than CVE-2010-2632.

Weakness

The product does not properly control the allocation and maintenance of a limited resource.

Affected Software

Name Vendor Start Version End Version
Vsftpd Vsftpd_project * 2.3.3 (excluding)
Red Hat Enterprise Linux 4 RedHat vsftpd-0:2.0.1-9.el4 *
Red Hat Enterprise Linux 5 RedHat vsftpd-0:2.0.5-16.el5_6.1 *
Red Hat Enterprise Linux 6 RedHat vsftpd-0:2.2.2-6.el6_0.1 *
Vsftpd Ubuntu dapper *
Vsftpd Ubuntu devel *
Vsftpd Ubuntu hardy *
Vsftpd Ubuntu karmic *
Vsftpd Ubuntu lucid *
Vsftpd Ubuntu maverick *
Vsftpd Ubuntu upstream *

Potential Mitigations

  • Mitigation of resource exhaustion attacks requires that the target system either:

  • The first of these solutions is an issue in itself though, since it may allow attackers to prevent the use of the system by a particular valid user. If the attacker impersonates the valid user, they may be able to prevent the user from accessing the server in question.

  • The second solution is simply difficult to effectively institute – and even when properly done, it does not provide a full solution. It simply makes the attack require more resources on the part of the attacker.

References