Improper verification of cryptographic signature in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network.
How could an attacker exploit this vulnerability? An authenticated attacker with low privileges could poison a shared cache used by the Exchange Control Panel, causing a malicious mail add-in to be installed in the context of another user's mailbox. Successful exploitation could allow the attacker to gain elevated privileges in the affected mailbox context. User interaction is not required. According to the CVSS metric, the attack complexity is high (AC:H). What does that mean for this vulnerability? Successful exploitation of this vulnerability requires an attacker to have a deep understanding of the system. Successful exploitation is not guaranteed and depends on a combination of factors that might include the environment, system configuration, and the presence of additional security measures.
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