ID CVE-2008-1668
Summary ftpd.c in (1) wu-ftpd 2.4.2 and (2) ftpd in HP HP-UX B.11.11 assigns uid 0 to the FTP client in certain operating-system misconfigurations in which PAM authentication can succeed even though no passwd entry is available for a user, which allows remote attackers to gain privileges, as demonstrated by a login attempt for an LDAP account when nsswitch.conf does not specify LDAP for passwd information.
Vulnerable Configurations
  • HP-UX 11.11
Base: 10.0 (as of 14-08-2008 - 09:26)
  • Accessing, Modifying or Executing Executable Files
    An attack of this type exploits a system's configuration that allows an attacker to either directly access an executable file, for example through shell access; or in a possible worst case allows an attacker to upload a file and then execute it. Web servers, ftp servers, and message oriented middleware systems which have many integration points are particularly vulnerable, because both the programmers and the administrators must be in synch regarding the interfaces and the correct privileges for each interface.
  • Leverage Executable Code in Non-Executable Files
    An attack of this type exploits a system's trust in configuration and resource files, when the executable loads the resource (such as an image file or configuration file) the attacker has modified the file to either execute malicious code directly or manipulate the target process (e.g. application server) to execute based on the malicious configuration parameters. Since systems are increasingly interrelated mashing up resources from local and remote sources the possibility of this attack occurring is high. The attack can be directed at a client system, such as causing buffer overrun through loading seemingly benign image files, as in Microsoft Security Bulletin MS04-028 where specially crafted JPEG files could cause a buffer overrun once loaded into the browser. Another example targets clients reading pdf files. In this case the attacker simply appends javascript to the end of a legitimate url for a pdf ( http://path/to/pdf/file.pdf#whatever_name_you_want=javascript:your_code_here The client assumes that they are reading a pdf, but the attacker has modified the resource and loaded executable javascript into the client's browser process. The attack can also target server processes. The attacker edits the resource or configuration file, for example a web.xml file used to configure security permissions for a J2EE app server, adding role name "public" grants all users with the public role the ability to use the administration functionality. The server trusts its configuration file to be correct, but when they are manipulated, the attacker gains full control.
  • Blue Boxing
    This type of attack against older telephone switches and trunks has been around for decades. A tone is sent by an adversary to impersonate a supervisor signal which has the effect of rerouting or usurping command of the line. While the US infrastructure proper may not contain widespread vulnerabilities to this type of attack, many companies are connected globally through call centers and business process outsourcing. These international systems may be operated in countries which have not upgraded Telco infrastructure and so are vulnerable to Blue boxing. Blue boxing is a result of failure on the part of the system to enforce strong authorization for administrative functions. While the infrastructure is different than standard current applications like web applications, there are historical lessons to be learned to upgrade the access control for administrative functions.
  • Restful Privilege Elevation
    Rest uses standard HTTP (Get, Put, Delete) style permissions methods, but these are not necessarily correlated generally with back end programs. Strict interpretation of HTTP get methods means that these HTTP Get services should not be used to delete information on the server, but there is no access control mechanism to back up this logic. This means that unless the services are properly ACL'd and the application's service implementation are following these guidelines then an HTTP request can easily execute a delete or update on the server side. The attacker identifies a HTTP Get URL such as http://victimsite/updateOrder, which calls out to a program to update orders on a database or other resource. The URL is not idempotent so the request can be submitted multiple times by the attacker, additionally, the attacker may be able to exploit the URL published as a Get method that actually performs updates (instead of merely retrieving data). This may result in malicious or inadvertent altering of data on the server.
  • Target Programs with Elevated Privileges
    This attack targets programs running with elevated privileges. The attacker would try to leverage a bug in the running program and get arbitrary code to execute with elevated privileges. For instance an attacker would look for programs that write to the system directories or registry keys (such as HKLM, which stores a number of critical Windows environment variables). These programs are typically running with elevated privileges and have usually not been designed with security in mind. Such programs are excellent exploit targets because they yield lots of power when they break. The malicious user try to execute its code at the same level as a privileged system call.
  • Manipulating Input to File System Calls
    An attacker manipulates inputs to the target software which the target software passes to file system calls in the OS. The goal is to gain access to, and perhaps modify, areas of the file system that the target software did not intend to be accessible.
nessus via4
  • NASL family HP-UX Local Security Checks
    NASL id HPUX_PHNE_38458.NASL
    description s700_800 11.11 ftpd(1M) and ftp(1) patch : A potential security vulnerability has been identified with HP-UX running ftpd. The vulnerability could be exploited to allow remote privileged access.
    last seen 2019-02-21
    modified 2018-08-10
    plugin id 33936
    published 2008-08-19
    reporter Tenable
    title HP-UX PHNE_38458 : HP-UX Running ftpd, Remote Privileged Access (HPSBUX02356 SSRT080051 rev.1)
  • NASL family FTP
    description According to its banner, the version of the HP-UX FTP server running on the remote host is at a patch level before PHNE_38458. Such versions reportedly contain a vulnerability that in certain account configurations could be exploited by an anonymous remote attacker to gain privileged access. Note that successful exploitation requires that pam is used for authenticating FTP users and that pam authentication passes when a user tries to log in while getpwnam returns NULL. This could occur, for example, if LDAP is used for pam authentication, the nsswitch.conf file does not include 'ldap' as a source for the 'passwd' database, and the attacker tries to log in with a username included in the LDAP directory.
    last seen 2019-02-21
    modified 2018-07-12
    plugin id 33899
    published 2008-08-15
    reporter Tenable
    title HP-UX ftpd PAM Authentication Configuration Weakness Authentication Bypass
oval via4
accepted 2014-03-24T04:01:49.334-04:00
class vulnerability
  • name Michael Wood
    organization Hewlett-Packard
  • name Sushant Kumar Singh
    organization Hewlett-Packard
description ftpd.c in (1) wu-ftpd 2.4.2 and (2) ftpd in HP HP-UX B.11.11 assigns uid 0 to the FTP client in certain operating-system misconfigurations in which PAM authentication can succeed even though no passwd entry is available for a user, which allows remote attackers to gain privileges, as demonstrated by a login attempt for an LDAP account when nsswitch.conf does not specify LDAP for passwd information.
family unix
id oval:org.mitre.oval:def:5971
status accepted
submitted 2008-08-12T16:30:32.000-04:00
title HP-UX Running ftpd, Remote Privileged Access
version 36
refmap via4
bid 30666
  • HPSBUX02356
  • SSRT080051
mlist [oss-security] 20080820 FW: CVE-2008-1668 - ftpd 2.4 - unauthorized root access - patch details
sectrack 1020682
secunia 31471
vupen ADV-2008-2364
xf hpux-ftpd-security-bypass(44414)
statements via4
contributor Joshua Bressers
lastmodified 2008-10-13
organization Red Hat
statement Not vulnerable. This flaw does not affect teh version of wu-ftpd as shipped in Red Hat Enterprise Linux 2.1.
Last major update 17-07-2013 - 11:41
Published 13-08-2008 - 14:41
Last modified 28-09-2017 - 21:30
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