VDB-164637 · CVE-2020-17083 · GCVE-0-2020-17083

Microsoft Exchange Server up to 2019 CU7 cross site scripting

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
4.8	$0-$5k	0.00

Summaryinfo

A vulnerability marked as problematic has been reported in Microsoft Exchange Server 2013 CU23/2016 CU17/2016 CU18/2019 CU6/2019 CU7. Affected by this vulnerability is an unknown functionality. Performing a manipulation results in Remote Privilege Escalation. This vulnerability is reported as CVE-2020-17083. The attack is possible to be carried out remotely. Moreover, an exploit is present. Applying a patch is the recommended action to fix this issue.

Detailsinfo

A vulnerability classified as problematic has been found in Microsoft Exchange Server 2013 CU23/2016 CU17/2016 CU18/2019 CU6/2019 CU7 (Groupware Software). This affects an unknown code. The manipulation with an unknown input leads to a remote privilege escalation vulnerability. CWE is classifying the issue as CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. This is going to have an impact on confidentiality, integrity, and availability.

The weakness was disclosed 11/10/2020 as confirmed security guidance (Website). The advisory is shared at portal.msrc.microsoft.com. This vulnerability is uniquely identified as CVE-2020-17083. The exploitability is told to be difficult. It is possible to initiate the attack remotely. It demands that the victim is doing some kind of user interaction. Technical details are unknown but a public exploit is available. MITRE ATT&CK project uses the attack technique T1059.007 for this issue.

A public exploit has been developed by Steven Seeley (mr_me) in PowerShell and been published before and not just after the advisory. The exploit is shared for download at srcincite.io. It is declared as proof-of-concept. We expect the 0-day to have been worth approximately $5k-$25k.

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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Productinfo

Type

Groupware Software

Vendor

Microsoft

Name

Exchange Server

Version

License

commercial

Website

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

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.5
VulDB Meta Temp Score: 5.0

VulDB Base Score: 5.5
VulDB Temp Score: 4.8
VulDB Vector: 🔍
VulDB Reliability: 🔍

Vendor Base Score (Microsoft): 5.5
Vendor Vector (Microsoft): 🔍

NVD Base Score: 5.4
NVD Vector: 🔍

CVSSv2info

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Cross site scripting
CWE: CWE-79 / CWE-94 / CWE-74
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Access: Public
Status: Proof-of-Concept
Author: Steven Seeley (mr_me)
Programming Language: 🔍
Download: 🔍

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Patch
Status: 🔍

Reaction Time: 🔍
0-Day Time: 🔍
Exposure Time: 🔍

Timelineinfo

08/04/2020 🔍
11/10/2020 +98 days 🔍
11/10/2020 +0 days 🔍
11/10/2020 +0 days 🔍
11/11/2020 +0 days 🔍
12/04/2020 +23 days 🔍

Sourcesinfo

Vendor: microsoft.com

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

CVE: CVE-2020-17083 (🔍)
GCVE (CVE): GCVE-0-2020-17083
GCVE (VulDB): GCVE-100-164637
scip Labs: https://www.scip.ch/en/?labs.20161013

Entryinfo

Created: 11/11/2020 09:08
Updated: 12/04/2020 23:37
Changes: 11/11/2020 09:08 (33), 11/11/2020 09:12 (18), 11/12/2020 07:19 (10), 12/04/2020 23:33 (3), 12/04/2020 23:37 (18)
Complete: 🔍
Committer: misc
Cache ID: 216::103