Two vulnerabilities in Microsoft Exchange Server

Published: 2017-09-12 21:51:37
Severity Low
Patch available YES
Number of vulnerabilities 2
CVSSv2 3.2 (AV:N/AC:M/Au:N/C:N/I:P/A:N/E:U/RL:OF/RC:C)
3.2 (AV:N/AC:M/Au:N/C:P/I:N/A:N/E:U/RL:OF/RC:C)
CVSSv3 5.2 [CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N/E:U/RL:O/RC:C]
3.6 [CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N/E:U/RL:O/RC:C]
CVE ID CVE-2017-8758
CVE-2017-11761
CWE ID CWE-79
CWE-200
Exploitation vector Network
Public exploit Not available
Vulnerable software Microsoft Exchange Server
Vulnerable software versions Microsoft Exchange Server 2016 Cumulative Update 6
Microsoft Exchange Server 2013 Service Pack 1
Microsoft Exchange Server 2016 Cumulative Update 5
Microsoft Exchange Server 2013 Cumulative Update 16
Microsoft Exchange Server 2013 Cumulative Update 17
Vendor URL Microsoft
Advisory type Public

Security Advisory

1) Cross-site scripting

Description

The disclosed vulnerability allows a remote attacker to perform cross-site scripting (XSS) attacks.

The vulnerability exists due to insufficient sanitization of user-supplied data. A remote attacker can trick the victim to follow a specially crafted link and execute arbitrary HTML and script code in user's browser in context of vulnerable website.

Successful exploitation of this vulnerability may allow a remote attacker to steal potentially sensitive information, change appearance of the web page, perform phishing and drive-by-download attacks.

Remediation

Install updates from vendor's website.

External links

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2017-8758

2) Information disclosure

Description

The vulnerability allows a remote attacker to obtain potentially sensitive information.

The vulnerability exists due to improper input sanitization issue in Microsoft Exchange. A remote attacker can send Calendar-related messages containing specially crafted tags to an Exchange server, trick the victim into observing telemetry from these requests and discerning properties of internal hosts intended to be hidden from the Internet, and identify the existence of RFC1918 addresses on the local network from a client on the Internet.

Remediation

Install updates from vendor's website.

External links

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2017-11761

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