What is the severity of CVE-2016-4028?

CVE-2016-4028 is classified as a high-severity vulnerability due to its potential to expose guest user credentials.

How do I fix CVE-2016-4028?

To mitigate CVE-2016-4028, update Open-Xchange OX Guard to version 2.4.0-rev8 or later.

What software is affected by CVE-2016-4028?

CVE-2016-4028 affects Open-Xchange OX Guard versions prior to 2.4.0-rev8.

What kind of attack can CVE-2016-4028 facilitate?

CVE-2016-4028 can facilitate a padding oracle attack that allows unauthorized access to guest user credentials.

Is there a workaround for CVE-2016-4028 if I cannot update immediately?

Currently, no specific workarounds are suggested for CVE-2016-4028 besides upgrading to the secured version.

Vulnerability/
CVE-2016-4028

high

7.5

CWE

255

15/12/2016

6/8/2024

CVE-2016-4028

First published: Thu Dec 15 2016(Updated: )

An issue was discovered in Open-Xchange OX Guard before 2.4.0-rev8. OX Guard uses an authentication token to identify and transfer guest users' credentials. The OX Guard API acts as a padding oracle by responding with different error codes depending on whether the provided token matches the encryption padding. In combination with AES-CBC, this allows attackers to guess the correct padding. Attackers may run brute-forcing attacks on the content of the guest authentication token and discover user credentials. For a practical attack vector, the guest users needs to have logged in, the content of the guest user's "OxReaderID" cookie and the value of the "auth" parameter needs to be known to the attacker.

Credit: cve@mitre.org

Affected Software	Affected Version	How to fix
Open-Xchange	<=2.4.0

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Reference Links

Frequently Asked Questions

What is the severity of CVE-2016-4028?
CVE-2016-4028 is classified as a high-severity vulnerability due to its potential to expose guest user credentials.
How do I fix CVE-2016-4028?
To mitigate CVE-2016-4028, update Open-Xchange OX Guard to version 2.4.0-rev8 or later.
What software is affected by CVE-2016-4028?
CVE-2016-4028 affects Open-Xchange OX Guard versions prior to 2.4.0-rev8.
What kind of attack can CVE-2016-4028 facilitate?
CVE-2016-4028 can facilitate a padding oracle attack that allows unauthorized access to guest user credentials.
Is there a workaround for CVE-2016-4028 if I cannot update immediately?
Currently, no specific workarounds are suggested for CVE-2016-4028 besides upgrading to the secured version.

agent/references
agent/softwarecombine
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collector/mitre-cve
source/MITRE
agent/severity
agent/author
agent/weakness
agent/last-modified-date
agent/description
agent/first-publish-date
agent/event
agent/source
agent/tags
collector/nvd-index
agent/software-canonical-lookup-request
vendor/open-xchange
canonical/open-xchange
version/open-xchange/2.4.0

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