Vulnerabilities > CVE-2009-4411 - Permissions, Privileges, and Access Controls vulnerability in XFS ACL 2.2.47

047910
CVSS 3.7 - LOW
Attack vector
LOCAL
Attack complexity
HIGH
Privileges required
NONE
Confidentiality impact
PARTIAL
Integrity impact
PARTIAL
Availability impact
PARTIAL
local
high complexity
xfs
CWE-264
nessus

Summary

The (1) setfacl and (2) getfacl commands in XFS acl 2.2.47, when running in recursive (-R) mode, follow symbolic links even when the --physical (aka -P) or -L option is specified, which might allow local users to modify the ACL for arbitrary files or directories via a symlink attack.

Vulnerable Configurations

Part Description Count
Application
Xfs
1

Common Attack Pattern Enumeration and Classification (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.

Nessus

  • NASL familySuSE Local Security Checks
    NASL idSUSE_11_0_ACL-100115.NASL
    descriptionthe setfacl tool followed symbolic links in recursive (-R) mode even if the --physical (-P) option was specified (CVE-2009-4411).
    last seen2020-06-01
    modified2020-06-02
    plugin id44360
    published2010-02-02
    reporterThis script is Copyright (C) 2010-2019 Tenable Network Security, Inc.
    sourcehttps://www.tenable.com/plugins/nessus/44360
    titleopenSUSE Security Update : acl (acl-1803)
  • NASL familySlackware Local Security Checks
    NASL idSLACKWARE_SSA_2011-108-01.NASL
    descriptionNew acl packages are available for Slackware 11.0, 12.0, 12.1, 12.2, 13.0, 13.1, and -current to fix a security issue.
    last seen2020-06-01
    modified2020-06-02
    plugin id53476
    published2011-04-19
    reporterThis script is Copyright (C) 2011-2019 Tenable Network Security, Inc.
    sourcehttps://www.tenable.com/plugins/nessus/53476
    titleSlackware 11.0 / 12.0 / 12.1 / 12.2 / 13.0 / 13.1 / current : acl (SSA:2011-108-01)
  • NASL familyGentoo Local Security Checks
    NASL idGENTOO_GLSA-201412-08.NASL
    descriptionThe remote host is affected by the vulnerability described in GLSA-201412-08 (Multiple packages, Multiple vulnerabilities fixed in 2010) Vulnerabilities have been discovered in the packages listed below. Please review the CVE identifiers in the Reference section for details. Insight Perl Tk Module Source-Navigator Tk Partimage Mlmmj acl Xinit gzip ncompress liblzw splashutils GNU M4 KDE Display Manager GTK+ KGet dvipng Beanstalk Policy Mount pam_krb5 GNU gv LFTP Uzbl Slim Bitdefender Console iputils DVBStreamer Impact : A context-dependent attacker may be able to gain escalated privileges, execute arbitrary code, cause Denial of Service, obtain sensitive information, or otherwise bypass security restrictions. Workaround : There are no known workarounds at this time.
    last seen2020-06-01
    modified2020-06-02
    plugin id79961
    published2014-12-15
    reporterThis script is Copyright (C) 2014-2019 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/79961
    titleGLSA-201412-08 : Multiple packages, Multiple vulnerabilities fixed in 2010
  • NASL familyMandriva Local Security Checks
    NASL idMANDRIVA_MDVSA-2009-345.NASL
    descriptionA vulnerability was discovered and corrected in acl : The (1) setfacl and (2) getfacl commands in XFS acl 2.2.47, when running in recursive (-R) mode, follow symbolic links even when the --physical (aka -P) or -L option is specified, which might allow local users to modify the ACL for arbitrary files or directories via a symlink attack (CVE-2009-4411). This update provides a fix for this vulnerability.
    last seen2020-06-01
    modified2020-06-02
    plugin id43610
    published2009-12-29
    reporterThis script is Copyright (C) 2009-2019 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/43610
    titleMandriva Linux Security Advisory : acl (MDVSA-2009:345)
  • NASL familySuSE Local Security Checks
    NASL idSUSE_11_ACL-100115.NASL
    descriptionThe setfacl tool followed symbolic links in recursive (-R) mode even if the --physical (-P) option was specified (CVE-2009-4411). This has been fixed.
    last seen2020-06-01
    modified2020-06-02
    plugin id44376
    published2010-02-02
    reporterThis script is Copyright (C) 2010-2019 Tenable Network Security, Inc.
    sourcehttps://www.tenable.com/plugins/nessus/44376
    titleSuSE 11 Security Update : acl and libacl (SAT Patch Number 1804)
  • NASL familySuSE Local Security Checks
    NASL idSUSE_11_1_ACL-100115.NASL
    descriptionthe setfacl tool followed symbolic links in recursive (-R) mode even if the --physical (-P) option was specified (CVE-2009-4411).
    last seen2020-06-01
    modified2020-06-02
    plugin id44366
    published2010-02-02
    reporterThis script is Copyright (C) 2010-2019 Tenable Network Security, Inc.
    sourcehttps://www.tenable.com/plugins/nessus/44366
    titleopenSUSE Security Update : acl (acl-1803)

Statements

contributorTomas Hoger
lastmodified2010-01-21
organizationRed Hat
statementNot vulnerable. This issue did not affect the versions of acl as shipped with Red Hat Enterprise Linux 3, 4, or 5.