Cross-site scripting in Microsoft Exchange Server OWA

1) Cross-site scripting

EUVDB-ID: #VU19077

Risk: Medium

CVSSv3.1: 6.4 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N/E:U/RL:W/RC:C]

CVE-ID: N/A

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

Exploit availability: No

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 passed via SVG images. A remote attacker can send a specially crafted email message that contains a malicious SVG image and and execute arbitrary HTML and script code in user's browser in context of Outlook on the web (formerly known as Outlook Web App) 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.

Mitigation

Vulnerable software versions

Microsoft Exchange Server: 2010 - 2019 RTM 15.02.0221.012

External links

http://portal.msrc.microsoft.com/en-US/security-guidance/advisory/ADV190021

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected application in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.