SB2018031309 - Multiple vulnerabilities in Microsoft Exchange OWA

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Main Vulnerability Database SB2018031309

SB2018031309 - Multiple vulnerabilities in Microsoft Exchange OWA

Published: March 13, 2018

Security Bulletin ID SB2018031309
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 3
Exploitation vector Remote access
Highest impact Data manipulation

Breakdown by Severity

Medium 33% Low 67%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 3 vulnerabilities.


1) Open redirect (CVE-ID: CVE-2018-0924)

CWE-ID: CWE-601 - URL Redirection to Untrusted Site ('Open Redirect')

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear


The vulnerability allows a remote attacker to redirect users to malicious websites.

The vulnerability exists due to insufficient validation of the redirected URL in Outlook Web Access (OWA) Light. A remote attacker can create a specially crafted link and perform phishing attacks against OWA users.


2) Information disclosure (CVE-ID: CVE-2018-0941)

CWE-ID: CWE-200 - Exposure of sensitive information to an unauthorized actor

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear


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

The vulnerability exists due to the way that Microsoft Exchange Server handles importing data. A remote attacker with ability to upload a specially crafted file to Microsoft Exchange Outlook Web Access (OWA), can get access to potentially sensitive information.


3) Cross-site scripting (CVE-ID: CVE-2018-0940)

CWE-ID: CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:U/U:Green


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 passed via hyperlinks in the email body. A remote attacker can create a specially crafted email message and execute arbitrary HTML and script code in user's browser in context of Outlook Web Access (OWA) 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 update from vendor's website.

References