CVE-2020-16969
Microsoft Exchange Information Disclosure Vulnerability
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Not listed in CISA KEV
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
Summary
<p>An information disclosure vulnerability exists in how Microsoft Exchange validates tokens when handling certain messages. An attacker who successfully exploited the vulnerability could use this to gain further information from a user.</p> <p>To exploit the vulnerability, an attacker could include specially crafted OWA messages that could be loaded, without warning or filtering, from the attacker-controlled URL. This callback vector provides an information disclosure tactic used in web beacons and other types of tracking systems.</p> <p>The security update corrects the way that Exchange handles these token validations.</p>
Timeline
- CVE published
- Record last updated
Affected versions
- Microsoft Microsoft Exchange Server 2019 Cumulative Update 6
From 15.02.0
- Microsoft Microsoft Exchange Server 2016 Cumulative Update 17
From 15.01.0
- Microsoft Microsoft Exchange Server 2019 Cumulative Update 7
From 15.02.0
- Microsoft Microsoft Exchange Server 2016 Cumulative Update 18
From 15.01.0
- Microsoft Microsoft Exchange Server 2013 Cumulative Update 23
From 15.00.0