ID CVE-2016-4028
Summary 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.
References
Vulnerable Configurations
  • cpe:2.3:a:open-xchange:ox_guard:*:rev7:*:*:*:*:*:*
    cpe:2.3:a:open-xchange:ox_guard:*:rev7:*:*:*:*:*:*
CVSS
Base: 3.5 (as of 19-10-2018 - 15:46)
Impact:
Exploitability:
CWE CWE-255
CAPEC
Access
VectorComplexityAuthentication
NETWORK MEDIUM SINGLE
Impact
ConfidentialityIntegrityAvailability
PARTIAL NONE NONE
cvss-vector via4 AV:N/AC:M/Au:S/C:P/I:N/A:N
refmap via4
bugtraq 20160622 Open-Xchange Security Advisory 2016-06-22
sectrack 1036154
Last major update 19-10-2018 - 15:46
Published 15-12-2016 - 06:59
Last modified 19-10-2018 - 15:46
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