Microsoft Security Response Center

Improper Link Resolution Before File Access ('Link Following') in Microsoft Exchange Server allows an authorized attacker to elevate privileges locally.

**What privileges could be gained by an attacker who successfully exploited the vulnerability?** The attacker would gain the rights of the user that is running the affected application.

**According to the CVSS metrics, successful exploitation of this vulnerability could lead to some loss of confidentiality (C:L) but have no effect on integrity (I:N) or on availability (A:N). What does that mean for this vulnerability?** An attacker who successfully exploited the vulnerability could view some sensitive information (Confidentiality) but not all resources within the impacted component may be divulged to the attacker. The attacker cannot make changes to disclosed information (Integrity) or limit access to the resource (Availability).

**According to the CVSS metric, user interaction is required (UI:R). What does that mean for this vulnerability?** Successful exploitation of this vulnerability requires an administrator to install the VM agent on the target device where an attacker has planted specially crafted malicious files.

**According to the CVSS metric, user interaction is required (UI:R). What interaction would the user have to do?** Minimal interaction with a malicious file by a user such as selecting (single-click), inspecting (right-click), or performing an action other than opening or executing the file could trigger this vulnerability.

**What privileges could be gained by an attacker who successfully exploited this vulnerability?** An attacker who successfully exploited this vulnerability could gain Kernel Memory Access.

**What privileges could be gained by an attacker who successfully exploited this vulnerability?** An attacker who successfully exploited this vulnerability could gain Kernel Memory Access.

Heap-based buffer overflow in Windows Core Messaging allows an authorized attacker to elevate privileges over a network.

**What privileges could be gained by an attacker who successfully exploited the vulnerability?** An attacker who successfully exploited this vulnerability could gain the privileges of the compromised user.

**According to the CVSS metric, the attack vector is local (AV:L). Why does the CVE title indicate that this is a remote code execution?** The word **Remote** in the title refers to the location of the attacker. This type of exploit is sometimes referred to as Arbitrary Code Execution (ACE). The attack itself is carried out locally. For example, when the score indicates that the **Attack Vector** is **Local** and **User Interaction** is **Required**, this could describe an exploit in which an attacker, through social engineering, convinces a victim to download and open a specially crafted file from a website which leads to a local attack on their computer.