ID CVE-2005-2959
Summary Incomplete blacklist vulnerability in sudo 1.6.8 and earlier allows local users to gain privileges via the (1) SHELLOPTS and (2) PS4 environment variables before executing a bash script on behalf of another user, which are not cleared even though other variables are.
Vulnerable Configurations
  • Todd Miller Sudo 1.6
  • Todd Miller Sudo 1.6.1
  • Todd Miller Sudo 1.6.2
  • Todd Miller Sudo 1.6.3
  • cpe:2.3:a:todd_miller:sudo:1.6.3_p1
  • cpe:2.3:a:todd_miller:sudo:1.6.3_p2
  • cpe:2.3:a:todd_miller:sudo:1.6.3_p3
  • cpe:2.3:a:todd_miller:sudo:1.6.3_p4
  • cpe:2.3:a:todd_miller:sudo:1.6.3_p5
  • cpe:2.3:a:todd_miller:sudo:1.6.3_p6
  • Todd Miller Sudo 1.6.3 p7
  • cpe:2.3:a:todd_miller:sudo:1.6.3p1
  • cpe:2.3:a:todd_miller:sudo:1.6.3p2
  • cpe:2.3:a:todd_miller:sudo:1.6.3p3
  • cpe:2.3:a:todd_miller:sudo:1.6.3p4
  • cpe:2.3:a:todd_miller:sudo:1.6.3p5
  • cpe:2.3:a:todd_miller:sudo:1.6.3p6
  • cpe:2.3:a:todd_miller:sudo:1.6.3p7
  • Todd Miller Sudo 1.6.4
  • cpe:2.3:a:todd_miller:sudo:1.6.4_p1
  • cpe:2.3:a:todd_miller:sudo:1.6.4_p2
  • cpe:2.3:a:todd_miller:sudo:1.6.4p1
  • Todd Miller Sudo 1.6.4p2
  • Todd Miller Sudo 1.6.5
  • cpe:2.3:a:todd_miller:sudo:1.6.5_p1
  • cpe:2.3:a:todd_miller:sudo:1.6.5_p2
  • cpe:2.3:a:todd_miller:sudo:1.6.5p1
  • cpe:2.3:a:todd_miller:sudo:1.6.5p2
  • Todd Miller Sudo 1.6.6
  • Todd Miller Sudo 1.6.7
  • cpe:2.3:a:todd_miller:sudo:1.6.7_p5
  • Todd Miller Sudo 1.6.8
Base: 4.6 (as of 25-10-2005 - 12:40)
  • 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 FreeBSD Local Security Checks
    NASL id FREEBSD_PKG_1B7250799EF611DAB410000E0C2E438A.NASL
    description Tavis Ormandy reports : The bash shell uses the value of the PS4 environment variable (after expansion) as a prefix for commands run in execution trace mode. Execution trace mode (xtrace) is normally set via bash's -x command line option or interactively by running 'set -o xtrace'. However, it may also be enabled by placing the string 'xtrace' in the SHELLOPTS environment variable before bash is started. A malicious user with sudo access to a shell script that uses bash can use this feature to run arbitrary commands for each line of the script.
    last seen 2019-02-21
    modified 2018-12-19
    plugin id 21392
    published 2006-05-13
    reporter Tenable
    title FreeBSD : sudo -- arbitrary command execution (1b725079-9ef6-11da-b410-000e0c2e438a)
  • NASL family Debian Local Security Checks
    description Tavis Ormandy noticed that sudo, a program that provides limited super user privileges to specific users, does not clean the environment sufficiently. The SHELLOPTS and PS4 variables are dangerous and are still passed through to the program running as privileged user. This can result in the execution of arbitrary commands as privileged user when a bash script is executed. These vulnerabilities can only be exploited by users who have been granted limited super user privileges.
    last seen 2019-02-21
    modified 2018-08-09
    plugin id 22736
    published 2006-10-14
    reporter Tenable
    title Debian DSA-870-1 : sudo - missing input sanitising
  • NASL family MacOS X Local Security Checks
    NASL id MACOSX_10_4_9.NASL
    description The remote host is running a version of Mac OS X 10.4 which is older than version 10.4.9 or a version of Mac OS X 10.3 which does not have Security Update 2007-003 applied. This update contains several security fixes for the following programs : - ColorSync - CoreGraphics - Crash Reporter - CUPS - Disk Images - DS Plugins - Flash Player - GNU Tar - HFS - HID Family - ImageIO - Kernel - MySQL server - Networking - OpenSSH - Printing - QuickDraw Manager - servermgrd - SMB File Server - Software Update - sudo - WebLog
    last seen 2019-02-21
    modified 2018-07-14
    plugin id 24811
    published 2007-03-13
    reporter Tenable
    title Mac OS X < 10.4.9 Multiple Vulnerabilities (Security Update 2007-003)
  • NASL family Mandriva Local Security Checks
    description Tavis Ormandy discovered that sudo does not perform sufficient environment cleaning; in particular the SHELLOPTS and PS4 variables are still passed to the program running as an alternate user which can result in the execution of arbitrary commands as the alternate user when a bash script is executed. The updated packages have been patched to correct this problem.
    last seen 2019-02-21
    modified 2018-07-19
    plugin id 20127
    published 2005-11-02
    reporter Tenable
    title Mandrake Linux Security Advisory : sudo (MDKSA-2005:201)
  • NASL family Ubuntu Local Security Checks
    description Tavis Ormandy discovered a privilege escalation vulnerability in sudo. On executing shell scripts with sudo, the 'P4' and 'SHELLOPTS' environment variables were not cleaned properly. If sudo is set up to grant limited sudo privileges to normal users this could be exploited to run arbitrary commands as the target user. Updated packags for Ubuntu 4.10 :. Note that Tenable Network Security has extracted the preceding description block directly from the Ubuntu security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.
    last seen 2019-02-21
    modified 2018-08-15
    plugin id 20631
    published 2006-01-15
    reporter Tenable
    title Ubuntu 4.10 / 5.04 / 5.10 : sudo vulnerability (USN-213-1)
packetstorm via4
data source
last seen 2016-12-05
published 2005-11-10
reporter breno
refmap via4
apple APPLE-SA-2007-03-13
bid 15191
cert TA07-072A
debian DSA-870
mandriva MDKSA-2005:201
openpkg OpenPKG-SA-2006.002
  • 17318
  • 17322
  • 17345
  • 17390
  • 17666
  • 18549
  • 24479
  • SUSE-SR:2005:025
  • SUSE-SR:2006:002
ubuntu USN-213-1
vupen ADV-2007-0930
statements via4
contributor Mark J Cox
lastmodified 2006-08-30
organization Red Hat
statement We do not consider this to be a security issue:
Last major update 28-07-2011 - 00:00
Published 25-10-2005 - 12:02
Last modified 03-10-2018 - 17:31
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