Microsoft Outlook Web Access contains a cross-site scripting vulnerability that could allow an unauthenticated, remote attacker to execute arbitrary HTML or script code in a user's browser.† Updates are not available.
Microsoft Outlook Web Access version 126.96.36.199 contains a cross-site scripting vulnerability that could allow an unauthenticated, remote attacker to execute arbitrary HTML or script code in a user's browser.
The vulnerability is due to improper validation of user-supplied input to a parameter that could permit cross-site scripting attacks.† An attacker could exploit the vulnerability to inject arbitrary HTML or script code into the user's browser that could allow the attacker to spoof content, disclose potentially sensitive information, or take actions as the user on the site.
Proof-of-concept code that exploits this vulnerability is publicly available.
Microsoft has not confirmed this vulnerability, and software updates are not available.
Microsoft Outlook Web Access version 188.8.131.52 running on Microsoft Exchange Server 2007 SP2 and prior is vulnerable.† Additional versions may also be vulnerable.
To exploit the vulnerability, an attacker must employ social engineering tactics, convincing the targeted user to follow a link to a malicious website. An exploit could allow the attacker to conduct cross-site scripting attacks against the user that could lead to information disclosure or further attacks.
Although a proof-of-concept URL is available, exploitability has not been proven. Only some versions of Outlook Web Access may be vulnerable when using certain versions of Internet Explorer.
Vendor announcements are not available.
An unauthenticated, remote attacker could exploit this vulnerability to conduct cross-site scripting attacks.† An exploit could allow the attacker to obtain sensitive information about the user, such as authentication cookies.
This vulnerability is due to insufficient validation of user-supplied input to the id parameter.
An unauthenticated, remote attacker could exploit the vulnerability by convincing a user to follow a link that is designed to pass malicious HTML or script code to the unchecked parameter. If the user follows the link, the URL may cause the vulnerable application to return unsanitized input to the user's browser, where the input may execute in the security context of the affected website. If successful, the attacker could access sensitive browser-based information.
Administrators are advised to contact the vendor regarding future updates and releases.
Administrators are advised to allow only trusted users to have network access.
Administrators are advised to implement an intrusion prevention system (IPS) or intrusion detection system (IDS) to help detect and prevent attacks that attempt to exploit this vulnerability.
Users should verify that unsolicited links are safe to follow.
Administrators are advised to monitor affected systems.
The security vulnerability applies to the following combinations of products.
Outlook Web Access
Original Release Base
2007 Base, SP1, SP2
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