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 1. MSRC
    MSRC
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 2. Customer Guidance
    Customer Guidance
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 3. Security Update Guide
    Security Update Guide
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 4. Vulnerabilities
    Vulnerabilities
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 5. CVE 2023 35389
    CVE 2023 35389


MICROSOFT DYNAMICS 365 ON-PREMISES REMOTE CODE EXECUTION VULNERABILITY

On this page
CVE-2023-35389Security Vulnerability

Released: Aug 8, 2023 Last updated: Aug 10, 2023

Assigning CNA:

This CVE was issued by Microsoft
Microsoft

CVE-2023-35389 

Impact: Remote Code Execution

Max Severity: Important

CVSS:3.1 6.5 / 5.7
Base score metrics: 6.5 / Temporal score metrics: 5.7
Base score metrics: 6.5 / Temporal score metrics: 5.7
Expand all
Collapse all
Metric

Value



Base score metrics(8)
Attack Vector
This metric reflects the context by which vulnerability exploitation is
possible. The Base Score increases the more remote (logically, and physically)
an attacker can be in order to exploit the vulnerable component.
Network
The vulnerable component is bound to the network stack and the set of possible
attackers extends beyond the other options listed, up to and including the
entire Internet. Such a vulnerability is often termed 'remotely exploitable' and
can be thought of as an attack being exploitable at the protocol level one or
more network hops away (e.g., across one or more routers).
Attack Complexity
This metric describes the conditions beyond the attacker’s control that must
exist in order to exploit the vulnerability. Such conditions may require the
collection of more information about the target or computational exceptions. The
assessment of this metric excludes any requirements for user interaction in
order to exploit the vulnerability. If a specific configuration is required for
an attack to succeed, the Base metrics should be scored assuming the vulnerable
component is in that configuration.
Low
Specialized access conditions or extenuating circumstances do not exist. An
attacker can expect repeatable success against the vulnerable component.
Privileges Required
This metric describes the level of privileges an attacker must possess before
successfully exploiting the vulnerability.
Low
The attacker is authorized with (i.e., requires) privileges that provide basic
user capabilities that could normally affect only settings and files owned by a
user. Alternatively, an attacker with Low privileges may have the ability to
cause an impact only to non-sensitive resources.
User Interaction
This metric captures the requirement for a user, other than the attacker, to
participate in the successful compromise the vulnerable component. This metric
determines whether the vulnerability can be exploited solely at the will of the
attacker, or whether a separate user (or user-initiated process) must
participate in some manner.
Required
Successful exploitation of this vulnerability requires a user to take some
action before the vulnerability can be exploited.
Scope
Does a successful attack impact a component other than the vulnerable component?
If so, the Base Score increases and the Confidentiality, Integrity and
Authentication metrics should be scored relative to the impacted component.
Changed
An exploited vulnerability can affect resources beyond the security scope
managed by the security authority of the vulnerable component. In this case, the
vulnerable component and the impacted component are different and managed by
different security authorities.
Confidentiality
This metric measures the impact to the confidentiality of the information
resources managed by a software component due to a successfully exploited
vulnerability. Confidentiality refers to limiting information access and
disclosure to only authorized users, as well as preventing access by, or
disclosure to, unauthorized ones.
Low
There is some loss of confidentiality. Access to some restricted information is
obtained, but the attacker does not have control over what information is
obtained, or the amount or kind of loss is limited. The information disclosure
does not cause a direct, serious loss to the impacted component.
Integrity
This metric measures the impact to integrity of a successfully exploited
vulnerability. Integrity refers to the trustworthiness and veracity of
information.
Low
Modification of data is possible, but the attacker does not have control over
the consequence of a modification, or the amount of modification is limited. The
data modification does not have a direct, serious impact on the impacted
component.
Availability
This metric measures the impact to the availability of the impacted component
resulting from a successfully exploited vulnerability. It refers to the loss of
availability of the impacted component itself, such as a networked service
(e.g., web, database, email). Since availability refers to the accessibility of
information resources, attacks that consume network bandwidth, processor cycles,
or disk space all impact the availability of an impacted component.
Low
Performance is reduced or there are interruptions in resource availability. Even
if repeated exploitation of the vulnerability is possible, the attacker does not
have the ability to completely deny service to legitimate users. The resources
in the impacted component are either partially available all of the time, or
fully available only some of the time, but overall there is no direct, serious
consequence to the impacted component.


Temporal score metrics(3)
Exploit Code Maturity
This metric measures the likelihood of the vulnerability being attacked, and is
typically based on the current state of exploit techniques, exploit code
availability, or active, 'in-the-wild' exploitation.
Unproven
No exploit code is available, or an exploit is theoretical.
Remediation Level
The Remediation Level of a vulnerability is an important factor for
prioritization. The typical vulnerability is unpatched when initially published.
Workarounds or hotfixes may offer interim remediation until an official patch or
upgrade is issued. Each of these respective stages adjusts the temporal score
downwards, reflecting the decreasing urgency as remediation becomes final.
Official Fix
A complete vendor solution is available. Either the vendor has issued an
official patch, or an upgrade is available.
Report Confidence
This metric measures the degree of confidence in the existence of the
vulnerability and the credibility of the known technical details. Sometimes only
the existence of vulnerabilities are publicized, but without specific details.
For example, an impact may be recognized as undesirable, but the root cause may
not be known. The vulnerability may later be corroborated by research which
suggests where the vulnerability may lie, though the research may not be
certain. Finally, a vulnerability may be confirmed through acknowledgement by
the author or vendor of the affected technology. The urgency of a vulnerability
is higher when a vulnerability is known to exist with certainty. This metric
also suggests the level of technical knowledge available to would-be attackers.
Confirmed
Detailed reports exist, or functional reproduction is possible (functional
exploits may provide this). Source code is available to independently verify the
assertions of the research, or the author or vendor of the affected code has
confirmed the presence of the vulnerability.

Please see Common Vulnerability Scoring System for more information on the
definition of these metrics.


EXPLOITABILITY

The following table provides an exploitability assessment for this vulnerability
at the time of original publication.
Publicly disclosed

Exploited

Exploitability assessment

No
No
Exploitation Less Likely


FAQ

According to the CVSS metric, the attack vector is network (AV:N). What is the
target used in the context of the remote code execution?

As an authenticated user, the attacker could attempt to trigger malicious code
in the context of the victim.

 * In an email attack scenario, an attacker could exploit the vulnerability by
   sending the specially crafted file to the user and convincing the user to
   open the file.
 * In a web-based attack scenario, an attacker could host a website (or leverage
   a compromised website that accepts or hosts user-provided content) containing
   a specially crafted file designed to exploit the vulnerability.

An attacker would have no way to force users to visit the website. Instead, an
attacker would have to convince users to click a link, typically by way of an
enticement in an email or instant message, and then convince them to open the
specially crafted file.

According to the CVSS metric, user interaction is required (UI:R). What
interaction would the user have to do?

A user would have to open a maliciously crafted email sent to Dynamics 365
Customer Engagement.

According to the CVSS metrics, successful exploitation of this vulnerability
could lead to minor loss of confidentiality (C:L), integrity (I:L) and
availability (A:L). What does that mean for this vulnerability?

While we cannot rule out the impact to Confidentiality, Integrity, and
Availability, the ability to exploit this vulnerability by itself is limited. An
attacker can force a bad response to be cached into a regular URL by having
multiple occurrences of the same variable in the query string. The impact
depends on the business logic of the user application.

According to the CVSS metric, a successful exploitation could lead to a scope
change (S:C). What does this mean for this vulnerability?

A user could be tricked into entering credentials or responding to a pop up
after opening a specially crafted file or clicking on a link, typically by way
of an enticement in an email or URL.

According to the CVSS metric, the attack vector is network (AV:N), and privilege
required is low (PR:L). What is the target used in the context of the remote
code execution?

The attacker for this vulnerability could target the server accounts in an
arbitrary or remote code execution. As an authenticated user, the attacker could
attempt to trigger malicious code in the context of the server's account through
a network call.

The privilege requirement is low because the attacker needs to be authenticated
as a normal user.


ACKNOWLEDGEMENTS

 * Vladimir Egorov

Microsoft recognizes the efforts of those in the security community who help us
protect customers through coordinated vulnerability disclosure. See
Acknowledgements for more information.


SECURITY UPDATES

To determine the support lifecycle for your software, see the Microsoft Support
Lifecycle.
Updates CVSS
Release date Descending
Release date

Product

Platform

Impact

Max Severity

Article

Download

Build Number

Details

Aug 8, 2023
Microsoft Dynamics 365 (on-premises) version 9.0
-
Remote Code Execution
Important
 * 5026500 

 * Security Update 

 * 9.0.47.08

CVE-2023-35389

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DISCLAIMER

The information provided in the Microsoft Knowledge Base is provided "as is"
without warranty of any kind. Microsoft disclaims all warranties, either express
or implied, including the warranties of merchantability and fitness for a
particular purpose. In no event shall Microsoft Corporation or its suppliers be
liable for any damages whatsoever including direct, indirect, incidental,
consequential, loss of business profits or special damages, even if Microsoft
Corporation or its suppliers have been advised of the possibility of such
damages. Some states do not allow the exclusion or limitation of liability for
consequential or incidental damages so the foregoing limitation may not apply.


REVISIONS

version

revisionDate

description

1.1
Aug 10, 2023

In the Security Updates table, removed Microsoft Dynamics 365 (on-premises)
version 9.1 as it is not affected by this vulnerability. This is an
informational change only.

1.0
Aug 8, 2023

Information published.

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