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AUSCERT External Security Bulletin Redistribution
ESB-2015.2566
sol17377: Multiple PHP vulnerabilities
9 October 2015
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AusCERT Security Bulletin Summary
---------------------------------
Product: F5 products
Publisher: F5 Networks
Operating System: Network Appliance
Impact/Access: Execute Arbitrary Code/Commands -- Remote/Unauthenticated
Modify Arbitrary Files -- Remote/Unauthenticated
Reduced Security -- Remote/Unauthenticated
Resolution: Mitigation
CVE Names: CVE-2015-6838 CVE-2015-6837 CVE-2015-6836
CVE-2015-6835 CVE-2015-6834
Reference: ESB-2015.2401
Original Bulletin:
https://support.f5.com/kb/en-us/solutions/public/17000/300/sol17377.html
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sol17377: Multiple PHP vulnerabilities
Security Advisory
Original Publication Date: 10/08/2015
Description
CVE-2015-6834
Use after free vulnerability was found in unserialize() function. We can
create ZVAL and free it via Serializable::unserialize. However the
unserialize() will still allow to use R: or r: to set references to that
already freed memory. It is possible to use-after-free attack and execute
arbitrary code remotely.
CVE-2015-6835
A use-after-free vulnerability was found in session deserializer. When
session deserializer (php/php_binary) is deserializing multiple data, it will
call php_var_unserialize() multiple times. We can create ZVAL and free it via
the php_var_unserialize() with a crafted serialized string. Then the next call
php_var_unserialize() will still allow to use R: or r: to set references to
that already freed memory. It is possible to use-after-free attack and execute
arbitrary code remotely.
CVE-2015-6836
A type confusion occurs within SOAP serialize_function_call due to an
insufficient validation of the headers field. In the SoapClient's __call
method, the verify_soap_headers_array check is applied only to headers
retrieved from zend_parse_parameters; problem is that a few lines later,
soap_headers could be updated or even replaced with values from the
default_headers object fields.
CVE-2015-6837 and CVE-2015-6838
The XSLTProcessor class misses a few checks on the input from the libxslt
library. The valuePop() function call is able to return NULL pointer and php
does not check that.
Impact
An attacker may require administrative privileges or exploitation of another
vulnerability to gain the ability to create or upload and cause the vulnerable
functions to run. When the vulnerability is exploited, the attacker may be
able to run arbitrary code remotely.
Status
F5 Product Development has assigned ID 534075 (BIG-IP), ID 536881 (BIG-IQ) and
ID 536882 (Enterprise Manager) to this vulnerability, and has evaluated the
currently supported releases for potential vulnerability.
To determine if your release is known to be vulnerable, the components or
features that are affected by the vulnerability, and for information about
releases or hotfixes that address the vulnerability, refer to the following
table:
Product Versions known to be vulnerable Versions known to be not vulnerable Severity Vulnerable component or feature
BIG-IP LTM 12.0.0
11.0.0 - 11.6.0
10.1.0 - 10.2.4 None Low PHP in Control Plane
BIG-IP AAM 12.0.0
11.4.0 - 11.6.0 None Low PHP in Control Plane
BIG-IP AFM 12.0.0
11.3.0 - 11.6.0 None Low PHP in Control Plane
BIG-IP
Analytics 12.0.0
11.0.0 - 11.6.0 None Low PHP in Control Plane
BIG-IP APM 12.0.0
11.0.0 - 11.6.0
10.1.0 - 10.2.4 None Low PHP in Control Plane
BIG-IP ASM 12.0.0
11.0.0 - 11.6.0
10.1.0 - 10.2.4 None Low PHP in Control Plane
BIG-IP DNS 12.0.0 None Low PHP in Control Plane
BIG-IP Edge
Gateway 11.0.0 - 11.3.0
10.1.0 - 10.2.4 None Low PHP in Control Plane
BIG-IP GTM 11.0.0 - 11.6.0
10.1.0 - 10.2.4 None Low PHP in Control Plane
BIG-IP Link
Controller 12.0.0
11.0.0 - 11.6.0
10.1.0 - 10.2.4 None Low PHP in Control Plane
BIG-IP PEM 12.0.0
11.3.0 - 11.6.0 None Low PHP in Control Plane
BIG-IP PSM 11.0.0 - 11.4.1
10.1.0 - 10.2.4 None Low PHP in Control Plane
BIG-IP
WebAccelerator 11.0.0 - 11.3.0
10.1.0 - 10.2.4 None Low PHP in Control Plane
BIG-IP WOM 11.0.0 - 11.3.0
10.1.0 - 10.2.4 None Low PHP in Control Plane
ARX None 6.0.0 - 6.4.0 Not vulnerable None
Enterprise
Manager 3.0.0 - 3.1.1 None Low PHP in Control Plane
FirePass None 7.0.0
6.0.0 - 6.1.0 Not vulnerable None
BIG-IQ Cloud 4.0.0 - 4.5.0 None Low PHP in Control Plane
BIG-IQ Device 4.2.0 - 4.5.0 None Low PHP in Control Plane
BIG-IQ
Security 4.0.0 - 4.5.0 None Low PHP in Control Plane
BIG-IQ ADC 4.5.0 None Low PHP in Control Plane
LineRate None 2.5.0 - 2.6.1 Not vulnerable None
F5 WebSafe None 1.0.0 Not vulnerable None
Traffix SDC None 4.0.0 - 4.4.0
3.3.2 - 3.5.1 Not vulnerable None
Important: Although the software of the affected F5 products contains the
vulnerable code, the affected F5 products do not use the vulnerable code in a
way that exposes the vulnerability in a default configuration for the control
plane. There is no data plane exposure for this vulnerability on the affected
F5 products.
Recommended Action
If you are running a version listed in the Versions known to be vulnerable
column, you can eliminate this vulnerability by upgrading to a version listed
in the Versions known to be not vulnerable column. If the table lists only an
older version than what you are currently running, or does not list a
non-vulnerable version, then no upgrade candidate currently exists.
F5 responds to vulnerabilities in accordance with the Severity values
published in the previous table. The Severity values and other security
vulnerability parameters are defined in SOL4602: Overview of the F5 security
vulnerability response policy.
To mitigate this vulnerability, you should permit management access to F5
products over a secure network and limit access to only trusted users. For
more information about securing access to BIG-IP/Enterprise Manager systems,
refer to SOL13309: Restricting access to the Configuration utility by source
IP address (11.x - 12.x) and SOL13092: Overview of securing access to the
BIG-IP system.
Additionally, you should avoid any customization of PHP files on the affected
F5 products.
Supplemental Information
SOL9970: Subscribing to email notifications regarding F5 products
SOL9957: Creating a custom RSS feed to view new and updated documents
SOL4918: Overview of the F5 critical issue hotfix policy
SOL167: Downloading software and firmware from F5
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