ID CVE-2011-2500
Summary The host_reliable_addrinfo function in support/export/hostname.c in nfs-utils before 1.2.4 does not properly use DNS to verify access to NFS exports, which allows remote attackers to mount filesystems by establishing crafted DNS A and PTR records.
References
Vulnerable Configurations
  • linux-nfs nfs-utils 1.2.3
    cpe:2.3:a:linux-nfs:nfs-utils:1.2.3
  • linux-nfs nfs-utils 1.2.2
    cpe:2.3:a:linux-nfs:nfs-utils:1.2.2
  • linux-nfs nfs-utils 1.2.1
    cpe:2.3:a:linux-nfs:nfs-utils:1.2.1
  • linux-nfs nfs-utils 1.2.0
    cpe:2.3:a:linux-nfs:nfs-utils:1.2.0
CVSS
Base: 7.5 (as of 18-02-2014 - 13:14)
Impact:
Exploitability:
CWE CWE-264
CAPEC
  • 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://www.gnucitizen.org/blog/danger-danger-danger/) 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.
Access
VectorComplexityAuthentication
NETWORK LOW NONE
Impact
ConfidentialityIntegrityAvailability
PARTIAL PARTIAL PARTIAL
nessus via4
  • NASL family Fedora Local Security Checks
    NASL id FEDORA_2011-8934.NASL
    description - Updated to latest upstream release: 1.2.4 - Fixes CVE-2011-2500 (bz 716950) Note that Tenable Network Security has extracted the preceding description block directly from the Fedora 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 2018-11-28
    plugin id 55528
    published 2011-07-07
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=55528
    title Fedora 15 : nfs-utils-1.2.4-0.fc15 (2011-8934)
  • NASL family Scientific Linux Local Security Checks
    NASL id SL_20111206_NFS_UTILS_ON_SL6_X.NASL
    description The nfs-utils packages provide a daemon for the kernel Network File System (NFS) server, and related tools such as the mount.nfs, umount.nfs, and showmount programs. A flaw was found in the way nfs-utils performed IP based authentication of mount requests. In configurations where a directory was exported to a group of systems using a DNS wildcard or NIS (Network Information Service) netgroup, an attacker could possibly gain access to other directories exported to a specific host or subnet, bypassing intended access restrictions. (CVE-2011-2500) It was found that the mount.nfs tool did not handle certain errors correctly when updating the mtab (mounted file systems table) file. A local attacker could use this flaw to corrupt the mtab file. (CVE-2011-1749) This update also fixes several bugs and adds an enhancement. Users of nfs-utils are advised to upgrade to these updated packages, which contain backported patches to resolve these issues and add this enhancement. After installing this update, the nfs service will be restarted automatically.
    last seen 2019-02-21
    modified 2018-12-31
    plugin id 61193
    published 2012-08-01
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=61193
    title Scientific Linux Security Update : nfs-utils on SL6.x i386/x86_64
  • NASL family Red Hat Local Security Checks
    NASL id REDHAT-RHSA-2011-1534.NASL
    description Updated nfs-utils packages that fix two security issues, various bugs, and add one enhancement are now available for Red Hat Enterprise Linux 6. The Red Hat Security Response Team has rated this update as having low security impact. Common Vulnerability Scoring System (CVSS) base scores, which give detailed severity ratings, are available for each vulnerability from the CVE links in the References section. The nfs-utils packages provide a daemon for the kernel Network File System (NFS) server, and related tools such as the mount.nfs, umount.nfs, and showmount programs. A flaw was found in the way nfs-utils performed IP based authentication of mount requests. In configurations where a directory was exported to a group of systems using a DNS wildcard or NIS (Network Information Service) netgroup, an attacker could possibly gain access to other directories exported to a specific host or subnet, bypassing intended access restrictions. (CVE-2011-2500) It was found that the mount.nfs tool did not handle certain errors correctly when updating the mtab (mounted file systems table) file. A local attacker could use this flaw to corrupt the mtab file. (CVE-2011-1749) This update also fixes several bugs and adds an enhancement. Documentation for these bug fixes and the enhancement will be available shortly from the Technical Notes document, linked to in the References section. Users of nfs-utils are advised to upgrade to these updated packages, which contain backported patches to resolve these issues and add this enhancement. After installing this update, the nfs service will be restarted automatically.
    last seen 2019-02-21
    modified 2018-12-20
    plugin id 57015
    published 2011-12-06
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=57015
    title RHEL 6 : nfs-utils (RHSA-2011:1534)
  • NASL family SuSE Local Security Checks
    NASL id SUSE_11_NFS-CLIENT-110701.NASL
    description When using wildcards in /etc/exports an attacker could gain unauthorized access to an NFS exported filesystem by creating a DNS record that resolves to the attacker's IP as well as to a trusted IP. (CVE-2011-2500)
    last seen 2019-02-21
    modified 2014-02-19
    plugin id 55548
    published 2011-07-11
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=55548
    title SuSE 11.1 Security Update : NFS (SAT Patch Number 4821)
  • NASL family SuSE Local Security Checks
    NASL id SUSE_11_4_NFS-CLIENT-110701.NASL
    description This update fixes the following security issues : When using wildcards in /etc/exports an attacker could gain unauthorized access to an nfs exported filesystem by creating a DNS record that resolves to the attacker's IP as well as to a trusted IP (CVE-2011-2500). mount.nfs could corrupt /etc/mtab (CVE-2011-1749).
    last seen 2019-02-21
    modified 2018-11-10
    plugin id 75978
    published 2014-06-13
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=75978
    title openSUSE Security Update : nfs-client (openSUSE-SU-2011:0747-1)
redhat via4
advisories
bugzilla
id 747400
title RHEL 6.2 beta rpcdebug has no flag for pNFS debug
oval
AND
  • comment nfs-utils is earlier than 1:1.2.3-15.el6
    oval oval:com.redhat.rhsa:tst:20111534005
  • comment nfs-utils is signed with Red Hat redhatrelease2 key
    oval oval:com.redhat.rhsa:tst:20111534006
  • OR
    • comment Red Hat Enterprise Linux 6 Client is installed
      oval oval:com.redhat.rhba:tst:20111656001
    • comment Red Hat Enterprise Linux 6 Server is installed
      oval oval:com.redhat.rhba:tst:20111656002
    • comment Red Hat Enterprise Linux 6 Workstation is installed
      oval oval:com.redhat.rhba:tst:20111656003
    • comment Red Hat Enterprise Linux 6 ComputeNode is installed
      oval oval:com.redhat.rhba:tst:20111656004
rhsa
id RHSA-2011:1534
released 2011-12-06
severity Low
title RHSA-2011:1534: nfs-utils security, bug fix, and enhancement update (Low)
rpms nfs-utils-1:1.2.3-15.el6
refmap via4
confirm
mlist [linux-nfs] 20110622 [PATCH] nfs: fix host_reliable_addrinfo (try #2)
Last major update 05-03-2014 - 23:30
Published 15-02-2014 - 09:57
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