ID CVE-2011-2520
Summary fw_dbus.py in system-config-firewall 1.2.29 and earlier uses the pickle Python module unsafely during D-Bus communication between the GUI and the backend, which might allow local users to gain privileges via a crafted serialized object.
References
Vulnerable Configurations
  • cpe:2.3:a:redhat:system-config-firewall:1.2.29
    cpe:2.3:a:redhat:system-config-firewall:1.2.29
  • cpe:2.3:a:redhat:system-config-firewall:1.2.28
    cpe:2.3:a:redhat:system-config-firewall:1.2.28
  • cpe:2.3:a:redhat:system-config-firewall:1.2.27
    cpe:2.3:a:redhat:system-config-firewall:1.2.27
  • cpe:2.3:a:redhat:system-config-firewall:1.2.26
    cpe:2.3:a:redhat:system-config-firewall:1.2.26
  • cpe:2.3:a:redhat:system-config-firewall:1.2.25
    cpe:2.3:a:redhat:system-config-firewall:1.2.25
  • cpe:2.3:a:redhat:system-config-firewall:1.2.24
    cpe:2.3:a:redhat:system-config-firewall:1.2.24
  • cpe:2.3:a:redhat:system-config-firewall:1.2.23
    cpe:2.3:a:redhat:system-config-firewall:1.2.23
  • cpe:2.3:a:redhat:system-config-firewall:1.2.22
    cpe:2.3:a:redhat:system-config-firewall:1.2.22
  • cpe:2.3:a:redhat:system-config-firewall:1.2.21
    cpe:2.3:a:redhat:system-config-firewall:1.2.21
  • cpe:2.3:a:redhat:system-config-firewall:1.2.17
    cpe:2.3:a:redhat:system-config-firewall:1.2.17
  • cpe:2.3:a:redhat:system-config-firewall:1.2.16
    cpe:2.3:a:redhat:system-config-firewall:1.2.16
  • cpe:2.3:a:redhat:system-config-firewall:1.2.15
    cpe:2.3:a:redhat:system-config-firewall:1.2.15
  • cpe:2.3:a:redhat:system-config-firewall:1.2.14
    cpe:2.3:a:redhat:system-config-firewall:1.2.14
  • cpe:2.3:a:redhat:system-config-firewall:1.2.12
    cpe:2.3:a:redhat:system-config-firewall:1.2.12
  • cpe:2.3:a:redhat:system-config-firewall:1.2.11
    cpe:2.3:a:redhat:system-config-firewall:1.2.11
CVSS
Base: 6.0 (as of 22-07-2011 - 12:06)
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
LOCAL HIGH SINGLE_INSTANCE
Impact
ConfidentialityIntegrityAvailability
COMPLETE COMPLETE COMPLETE
nessus via4
  • NASL family Oracle Linux Local Security Checks
    NASL id ORACLELINUX_ELSA-2011-0953.NASL
    description From Red Hat Security Advisory 2011:0953 : Updated system-config-firewall packages that fix one security issue are now available for Red Hat Enterprise Linux 6. The Red Hat Security Response Team has rated this update as having moderate security impact. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available from the CVE link in the References section. system-config-firewall is a graphical user interface for basic firewall setup. It was found that system-config-firewall used the Python pickle module in an insecure way when sending data (via D-Bus) to the privileged back-end mechanism. A local user authorized to configure firewall rules using system-config-firewall could use this flaw to execute arbitrary code with root privileges, by sending a specially crafted serialized object. (CVE-2011-2520) Red Hat would like to thank Marco Slaviero of SensePost for reporting this issue. This erratum updates system-config-firewall to use JSON (JavaScript Object Notation) for data exchange, instead of pickle. Therefore, an updated version of system-config-printer that uses this new communication data format is also provided in this erratum. Users of system-config-firewall are advised to upgrade to these updated packages, which contain a backported patch to resolve this issue. Running instances of system-config-firewall must be restarted before the utility will be able to communicate with its updated back-end.
    last seen 2019-02-21
    modified 2018-07-18
    plugin id 68307
    published 2013-07-12
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=68307
    title Oracle Linux 6 : system-config-firewall (ELSA-2011-0953)
  • NASL family Fedora Local Security Checks
    NASL id FEDORA_2011-9652.NASL
    description - fixed possible privilege escalation flaw via use of python pickle (CVE-2011-2520), replaced pickle by json (rhbz#717985) and (rhbz#722991) - stop D-BUS firewall mechanism on update, because D-BUS interface will not be compatible to old pickle version - system-config-printer needs to get updated, too 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 55753
    published 2011-08-02
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=55753
    title Fedora 15 : system-config-firewall-1.2.29-4.fc15 (2011-9652)
  • NASL family Red Hat Local Security Checks
    NASL id REDHAT-RHSA-2011-0953.NASL
    description Updated system-config-firewall packages that fix one security issue are now available for Red Hat Enterprise Linux 6. The Red Hat Security Response Team has rated this update as having moderate security impact. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available from the CVE link in the References section. system-config-firewall is a graphical user interface for basic firewall setup. It was found that system-config-firewall used the Python pickle module in an insecure way when sending data (via D-Bus) to the privileged back-end mechanism. A local user authorized to configure firewall rules using system-config-firewall could use this flaw to execute arbitrary code with root privileges, by sending a specially crafted serialized object. (CVE-2011-2520) Red Hat would like to thank Marco Slaviero of SensePost for reporting this issue. This erratum updates system-config-firewall to use JSON (JavaScript Object Notation) for data exchange, instead of pickle. Therefore, an updated version of system-config-printer that uses this new communication data format is also provided in this erratum. Users of system-config-firewall are advised to upgrade to these updated packages, which contain a backported patch to resolve this issue. Running instances of system-config-firewall must be restarted before the utility will be able to communicate with its updated back-end.
    last seen 2019-02-21
    modified 2018-11-26
    plugin id 55616
    published 2011-07-19
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=55616
    title RHEL 6 : system-config-firewall (RHSA-2011:0953)
  • NASL family Scientific Linux Local Security Checks
    NASL id SL_20110718_SYSTEM_CONFIG_FIREWALL_ON_SL6_X.NASL
    description system-config-firewall is a graphical user interface for basic firewall setup. It was found that system-config-firewall used the Python pickle module in an insecure way when sending data (via D-Bus) to the privileged back-end mechanism. A local user authorized to configure firewall rules using system-config-firewall could use this flaw to execute arbitrary code with root privileges, by sending a specially crafted serialized object. (CVE-2011-2520) This erratum updates system-config-firewall to use JSON (JavaScript Object Notation) for data exchange, instead of pickle. Therefore, an updated version of system-config-printer that uses this new communication data format is also provided in this erratum. Users of system-config-firewall are advised to upgrade to these updated packages, which contain a backported patch to resolve this issue. Running instances of system-config-firewall must be restarted before the utility will be able to communicate with its updated back-end.
    last seen 2019-02-21
    modified 2018-12-31
    plugin id 61084
    published 2012-08-01
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=61084
    title Scientific Linux Security Update : system-config-firewall on SL6.x i386/x86_64
redhat via4
advisories
bugzilla
id 717985
title CVE-2011-2520 system-config-firewall: privilege escalation flaw via use of python pickle
oval
AND
  • OR
    • comment Red Hat Enterprise Linux 6 Client is installed
      oval oval:com.redhat.rhsa:tst:20100842001
    • comment Red Hat Enterprise Linux 6 Server is installed
      oval oval:com.redhat.rhsa:tst:20100842002
    • comment Red Hat Enterprise Linux 6 Workstation is installed
      oval oval:com.redhat.rhsa:tst:20100842003
    • comment Red Hat Enterprise Linux 6 ComputeNode is installed
      oval oval:com.redhat.rhsa:tst:20100842004
  • OR
    • AND
      • comment system-config-firewall is earlier than 0:1.2.27-3.el6_1.3
        oval oval:com.redhat.rhsa:tst:20110953005
      • comment system-config-firewall is signed with Red Hat redhatrelease2 key
        oval oval:com.redhat.rhsa:tst:20110953006
    • AND
      • comment system-config-firewall-base is earlier than 0:1.2.27-3.el6_1.3
        oval oval:com.redhat.rhsa:tst:20110953007
      • comment system-config-firewall-base is signed with Red Hat redhatrelease2 key
        oval oval:com.redhat.rhsa:tst:20110953008
    • AND
      • comment system-config-firewall-tui is earlier than 0:1.2.27-3.el6_1.3
        oval oval:com.redhat.rhsa:tst:20110953009
      • comment system-config-firewall-tui is signed with Red Hat redhatrelease2 key
        oval oval:com.redhat.rhsa:tst:20110953010
    • AND
      • comment system-config-printer is earlier than 0:1.1.16-17.el6_1.2
        oval oval:com.redhat.rhsa:tst:20110953011
      • comment system-config-printer is signed with Red Hat redhatrelease2 key
        oval oval:com.redhat.rhsa:tst:20110953012
    • AND
      • comment system-config-printer-libs is earlier than 0:1.1.16-17.el6_1.2
        oval oval:com.redhat.rhsa:tst:20110953015
      • comment system-config-printer-libs is signed with Red Hat redhatrelease2 key
        oval oval:com.redhat.rhsa:tst:20110953016
    • AND
      • comment system-config-printer-udev is earlier than 0:1.1.16-17.el6_1.2
        oval oval:com.redhat.rhsa:tst:20110953013
      • comment system-config-printer-udev is signed with Red Hat redhatrelease2 key
        oval oval:com.redhat.rhsa:tst:20110953014
rhsa
id RHSA-2011:0953
released 2011-07-18
severity Moderate
title RHSA-2011:0953: system-config-firewall security update (Moderate)
rpms
  • system-config-firewall-0:1.2.27-3.el6_1.3
  • system-config-firewall-base-0:1.2.27-3.el6_1.3
  • system-config-firewall-tui-0:1.2.27-3.el6_1.3
  • system-config-printer-0:1.1.16-17.el6_1.2
  • system-config-printer-libs-0:1.1.16-17.el6_1.2
  • system-config-printer-udev-0:1.1.16-17.el6_1.2
refmap via4
bid 48715
confirm https://bugzilla.redhat.com/show_bug.cgi?id=717985
fedora FEDORA-2011-9652
mlist [oss-security] 20110718 CVE-2011-2520: flaw in system-config-firewall's usage of pickle allows privilege escalation
sectrack 1025793
secunia 45294
xf systemconfigfirewall-priv-escalation(68734)
Last major update 11-08-2011 - 22:45
Published 21-07-2011 - 19:55
Last modified 28-08-2017 - 21:29
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