Microsoft Exchange Server Email code injection

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CVSS Meta Temp Score
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CTI Interest Score
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7.8$0-$5k0.21

A vulnerability, which was classified as critical, was found in Microsoft Exchange Server 2016 Update 16/2016 Update 17/2019 Update 5/2019 Update 6 (Groupware Software). Affected is an unknown function of the component Email Handler. The manipulation with an unknown input leads to a privilege escalation vulnerability. CWE is classifying the issue as CWE-94. This is going to have an impact on confidentiality, integrity, and availability.

The weakness was published 09/08/2020 as confirmed security update guide (Website). The advisory is shared for download at portal.msrc.microsoft.com. The public release has been coordinated with the vendor. This vulnerability is traded as CVE-2020-16875 since 08/04/2020. It is possible to launch the attack remotely. The exploitation requires an enhanced level of successful authentication. Successful exploitation requires user interaction by the victim. Technical details are unknown but a public exploit is available. The advisory points out:

A remote code execution vulnerability exists in Microsoft Exchange software when the software fails to properly handle objects in memory. An attacker who successfully exploited the vulnerability could run arbitrary code in the context of the System user. An attacker could then install programs; view, change, or delete data; or create new accounts.

A public exploit has been developed by Steven Seeley (mr_me) in Python and been published immediately after the advisory. It is declared as functional. The exploit is shared for download at srcincite.io. As 0-day the estimated underground price was around $25k-$100k.

Applying a patch is able to eliminate this problem. A possible mitigation has been published immediately after the disclosure of the vulnerability.

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CVSSv3infoedit

VulDB Meta Base Score: 8.4
VulDB Meta Temp Score: 7.8

VulDB Base Score: 9.0
VulDB Temp Score: 8.3
VulDB Vector: 🔒
VulDB Reliability: 🔍

Vendor Base Score (Microsoft): 9.1
Vendor Vector (Microsoft): 🔒

NVD Base Score: 7.2
NVD Vector: 🔒

CVSSv2infoedit

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VulDB Base Score: 🔒
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Exploitinginfoedit

Class: Privilege escalation
CWE: CWE-94
ATT&CK: Unknown

Local: No
Remote: Yes

Availability: 🔒
Access: Public
Status: Functional
Author: Steven Seeley (mr_me)
Programming Language: 🔒
Download: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfoedit

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Countermeasuresinfoedit

Recommended: Patch
Status: 🔍

Reaction Time: 🔒
0-Day Time: 🔒
Exposure Time: 🔒
Exploit Delay Time: 🔍

Timelineinfoedit

08/04/2020 CVE assigned
09/08/2020 +35 days Advisory disclosed
09/08/2020 +0 days Exploit disclosed
09/08/2020 +0 days Countermeasure disclosed
09/08/2020 +0 days VulDB entry created
11/13/2020 +66 days VulDB last update

Sourcesinfoedit

Vendor: https://www.microsoft.com/

Advisory: portal.msrc.microsoft.com
Status: Confirmed
Coordinated: 🔒

CVE: CVE-2020-16875 (🔒)
scip Labs: https://www.scip.ch/en/?labs.20161013

Entryinfoedit

Created: 09/09/2020 12:22 AM
Updated: 11/13/2020 03:07 PM
Changes: (1) source_cve_assigned
Complete: 🔍
Committer: misc

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