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A10 Networks Loadbalancer Directory Traversal

A10 Networks Loadbalancer Directory Traversal
Posted Jan 28, 2014
Authored by xistence

A10 Networks Loadbalancer versions (Soft)AX 2.6.1-GR1-P5 and below and 2.7.0 build 217 and below suffer from a directory traversal vulnerability.

tags | exploit, file inclusion
SHA-256 | cd1d7881579b65ddec9b55be9bc64a68cfb6ab226deae42efa4a82f9439a111f

A10 Networks Loadbalancer Directory Traversal

Change Mirror Download
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Author:
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xistence < xistence[at]0x90[.]nl >

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Affected products:
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A10 Networks Loadbalancer (Soft)AX <=2.6.1-GR1-P5 & <=2.7.0 build 217

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Affected vendors:
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A10Networks
http://www.a10networks.com/

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Product description:
-------------------------

SupportCenter Plus is a web-based customer support software that lets
organizations effectively manage customer tickets,
their account & contact information, the service contracts and in the
process providing a superior customer experience.

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Details:
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[ 0x01 - Directory Traversal ]

A10 Networks (Soft)AX <=2.6.1-GR1-P5 & <=2.7.0 build 217 is prone to an
unauthenticated directory traversal vulnerability.
It's possible to download any file on the remote AX device with root
privileges, without the need to authenticate to the website.

The bug was fixed earlier in A10 Tracking ID "82150" according to the
release notes, however the fix is not sufficient and can be bypassed.

The new protection seems to make sure files are under the /a10data/tmp dir
(https://<IP>/xml/downloads/?filename=/a10data/tmp/).

By sending a GET request to
"https://<IP>/xml/downloads/?filename=/a10data/tmp/../.."
and thus keeping /a10data/tmp, we can bypass this. So if we would like
to download the file /etc/shadow we send a GET request to "https://
<IP>/xml/downloads/?filename=/a10data/tmp/../../etc/passwd".

Or if we would like to download a certificate key file: "https://
<IP>/xml/downloads/?filename=/a10data/tmp/../../a10data/key/domain.com"

WARNING: Downloading a file will delete it from the AX device!


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Solution:
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Upgrade to a newer version.

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Timeline:
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Fixed somewhere back in 2013 :)
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