Microsoft Exchange Server / Open Redirect

2018.03.28
Credit: hyp3rlinx
Risk: Low
Local: No
Remote: Yes
CWE: N/A


CVSS Base Score: 5.8/10
Impact Subscore: 4.9/10
Exploitability Subscore: 8.6/10
Exploit range: Remote
Attack complexity: Medium
Authentication: No required
Confidentiality impact: Partial
Integrity impact: Partial
Availability impact: None

[+] Credits: John Page (aka hyp3rlinx) [+] Website: hyp3rlinx.altervista.org [+] Source: http://hyp3rlinx.altervista.org/advisories/MICROSOFT-EXCHANGE-SERVER-OPEN-REDIRECT-CVE-2016-3378.txt [+] ISR: Apparition Security Vendor: ================= www.microsoft.com Product: =========== Microsoft Exchange Server Vulnerability Type: =================== Open redirect CVE Reference: ============== CVE-2016-3378 MS16-108 Security Issue: ================ Microsoft Exchange Server is vulnerable to Open redirect allowing attackers who either send a link or pop a web page in a new window the possibility to trick victims to either click "Go back" or the "return to sharepoint link" that will then redirect users to arbitrary web sites where attackers can then conduct phishing attacks or trick a user to download malicious executables etc. Vulnerable: Microsoft Exchange Server 2016 Cumulative Update 2 Microsoft Exchange Server 2016 Cumulative Update 1 Microsoft Exchange Server 2013 SP1 0 Microsoft Exchange Server 2013 Cumulative Update 13 Microsoft Exchange Server 2013 Cumulative Update 12 References: =========== https://securitytracker.com/id/1036778 http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=cve-2016-3378 Exploit/POC: ============= 1) access the URL (and login if need be) 2) click the link where says "Go back to the SharePoint site for now" and BOOM! https://outlook.office365.com/ecp/TeamMailbox/NewSharePointTeamMailbox.aspx?exsvurl=0&SPUrl=http%3a%2f%2fhyp3rlinx.altervista.org&Title=Go%20back&SPTMAppUrl=https://outlook.office365.com&realm=https://outlook.office365.com&wa=wsignin1.0 Network Access: =============== Remote Severity: ========= Medium Disclosure Timeline: ============================= Vendor Notification: December 22, 2015 Been fixed by MS a long time now... March 27, 2018 : Public Disclosure [+] Disclaimer The information contained within this advisory is supplied "as-is" with no warranties or guarantees of fitness of use or otherwise. Permission is hereby granted for the redistribution of this advisory, provided that it is not altered except by reformatting it, and that due credit is given. Permission is explicitly given for insertion in vulnerability databases and similar, provided that due credit is given to the author. The author is not responsible for any misuse of the information contained herein and accepts no responsibility for any damage caused by the use or misuse of this information. The author prohibits any malicious use of security related information or exploits by the author or elsewhere. All content (c). hyp3rlinx

References:

http://hyp3rlinx.altervista.org/advisories/MICROSOFT-EXCHANGE-SERVER-OPEN-REDIRECT-CVE-2016-3378.txt


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