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[R2] Palo Alto Networks Panorama VM Appliance PAN-OS Firmware Signature Verification Bypass Arbitrary Code Execution

High

Synopsis

Palo Alto Networks Panorama VM Appliance, running PAN-OS version 6.0 contains a flaw related to the processing of new firmware. During the installation of the firmware, the system will execute python code within an image file before verifying the signature of the of the file. A portion of the vulnerable code:


# Read out the image header
f = open(secimage, 'rb')
hdr = f.read(256)
hdr = f.read(3584)
f.close()
try:
hdr = struct.unpack('3584s', hdr)[0].split('\0')[0]
Try and ensure a dictionary before running eval on it
if hdr[0] == ' {' and hdr[-1] == '}
':
self.imginfo.update(eval(hdr))
except: pass

Exploitation of this issue would require tricking an administrator to install a file from a malicious source (e.g. social engineering, hosting on a phishing site, man-in-the-middle a legitimate download). If the device has an auto-update mechanism for firmware, a man-in-the-middle attack would be more feasible.

Note that other Palo Alto devices and technology may contain the same flaw, but were not tested.

Solution

Upgrade to version 6.0.1 or later.

Disclosure Timeline

2015-02-11 - Issue discovered
2015-06-29 - Vendor Informed of vuln
2015-06-29 - Reply from Product Manager, confirming issue was fixed in 6.0.1
2015-08-20 - CVE Requested and Assigned

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Tenable takes product security very seriously. If you believe you have found a vulnerability in one of our products, we ask that you please work with us to quickly resolve it in order to protect customers. Tenable believes in responding quickly to such reports, maintaining communication with researchers, and providing a solution in short order.

For more details on submitting vulnerability information, please see our Vulnerability Reporting Guidelines page.

If you have questions or corrections about this advisory, please email [email protected]

Risk Information

CVE ID: CVE-2015-6531
Tenable Advisory ID
TRA-2015-02
Credit

Nicholas Miles, Tenable Network Security

CVSSv2 Base / Temporal Score
7.6 / 6.0
CVSSv2 Vector
(AV:N/AC:H/Au:N/C:C/I:C/A:C/E:POC/RL:OF/RC:C)
Additional Keywords
Case # 00346726
Affected Products
Panorama VM Appliance 6.0.0 Firmware
Risk Factor
High

Advisory Timeline

2015-09-15 - [R1] Initial Release
2015-09-21 - [R2] Clarified 6.0.1 as solution, rather than 6.1.1
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