CVE-2016-4028

Description

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.

Category

7.5
CVSS
Severity: High
CVSS 3.0 •
CVSS 2.0 •
EPSS 0.20%
Third-Party Advisory securitytracker.com
Affected: n/a n/a
Published at:
Updated at:

References

Link Tags
http://www.securitytracker.com/id/1036154 vdb entry third party advisory
http://www.securityfocus.com/archive/1/538732/100/0/threaded mailing list

Frequently Asked Questions

What is the severity of CVE-2016-4028?
CVE-2016-4028 has been scored as a high severity vulnerability.
How to fix CVE-2016-4028?
To fix CVE-2016-4028, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2016-4028 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2016-4028 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
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