Security updates have been released for Exchange 2010, Exchange 2013, Exchange 2016 and Exchange 2019.
- CVE-2019-1084: Microsoft Exchange Information Disclosure Vulnerability (All)
An information disclosure vulnerability exists when Exchange allows creation of entities with Display Names having non-printable characters. An authenticated attacker could exploit this vulnerability by creating entities with invalid display names, which, when added to conversations, remain invisible. This security update addresses the issue by validating display names upon creation in Microsoft Exchange, and by rendering invalid display names correctly in Microsoft Outlook clients.
- CVE-2019-1136: Microsoft Exchange Server Elevation of Privilege Vulnerability (Exchange 2010/2013/2016)
An elevation of privilege vulnerability exists in Microsoft Exchange Server. An attacker who successfully exploited this vulnerability could gain the same rights as any other user of the Exchange server. This could allow the attacker to perform activities such as accessing the mailboxes of other users. Exploitation of this vulnerability requires Exchange Web Services (EWS) to be enabled and in use in an affected environment. To exploit the vulnerability, an attacker would need to execute a man-in-the-middle attack to forward an authentication request to a Microsoft Exchange Server, thereby allowing impersonation of another Exchange user. To address this vulnerability, Microsoft has changed the way EWS handles NTLM tokens.
- CVE-2019-1137: Microsoft Exchange Server Spoofing Vulnerability (Exchange 2013/2016/2019)
A cross-site-scripting (XSS) vulnerability exists when Microsoft Exchange Server does not properly sanitize a specially crafted web request to an affected Exchange server. An authenticated attacker could exploit the vulnerability by sending a specially crafted request to an affected server. The attacker who successfully exploited the vulnerability could then perform cross-site scripting attacks on affected systems and run script in the security context of the current user. The attacks could allow the attacker to read content that the attacker is not authorized to read, use the victim’s identity to take actions on the Exchange server on behalf of the user, such as change permissions and delete content, and inject malicious content in the browser of the user. The security update addresses the vulnerability by helping to ensure that Exchange Server properly sanitizes web requests.
View: Description of the security update for Microsoft Exchange Server 2010: July 9, 2019
View: Description of the security update for Microsoft Exchange Server 2013 and 2016: July 9, 2019
View: Description of the security update for Microsoft Exchange Server 2019: July 9, 2019
Download: Update Rollup 29 For Exchange 2010 SP3 (KB4509410)
Download: Security Update For Exchange Server 2013 CU23 (KB4509409)
Download: Security Update For Exchange Server 2016 CU12 (KB4509409)
Download: Security Update For Exchange Server 2016 CU13 (KB4509409)
Download: Security Update For Exchange Server 2019 CU1 (KB4509408)
Download: Security Update For Exchange Server 2019 CU2 (KB4509408)