TITLE: Multiple Vulnerabilities in Adobe Products Could Allow for Arbitrary Code Execution

DESCRIPTION:
Multiple vulnerabilities have been discovered in Adobe Products, the
most severe of which could allow for arbitrary code execution.

* Connect is a suite of software for remote training, web conferencing,
presentation, and desktop sharing.
* Acrobat and Reader is a family of application software and Web
services mainly used to create, view, and edit PDF documents.
* Experience Manager is a content management solution for building
websites, mobile apps, and forms.
* Creative Cloud is a cloud service provided by Adobe where its software
can be accessed all in one place
* RoboHelp Server is a help authoring tool
* Photoshop Elements and Photoshop is a photo editing software
* Premiere is a video editing software
* After Effects is a graphics and visual effects software
* Animate is a multimedia authoring computer animation program.

Successful exploitation of the most severe of these vulnerabilities
could allow for arbitrary code execution. Depending on the privileges
associated with the user an attacker could then install programs; view,
change, or delete data; or create new accounts with full user rights.
Users whose accounts are configured to have fewer user rights on the
system could be less impacted than those who operate with administrative
user rights.

IMPACT:
Multiple vulnerabilities have been discovered in Adobe Products, the
most severe of which could allow for arbitrary code execution. Details
of these vulnerabilities are as follows:

Adobe Connect
* Improper Access Control vulnerability, which could allow for privilege
escalation (CVE-2021-28579)

Adobe Acrobat and Reader
* Out-of-bounds read vulnerability, which could allow arbitrary code
execution. (CVE-2021-28554, CVE-2021-28551)
* Use After Free vulnerabilities, which could allow for arbitrary code
execution. (CVE-2021-28552, CVE-2021-28631, CVE-2021-28632)

Adobe Photoshop
* Heap-based Buffer Overflow, which could allow for arbitrary code
execution. (CVE-2021-28624)
* Buffer Overflow, which could allow for arbitrary code execution.
(CVE-2021-28582)

Adobe Experience Manager
* Cross-site scripting vulnerability, which could allow for arbitrary
code execution. (CVE-2021-28625)
* Improper Authorization vulnerability, which could allow for
application denial-of-service. (CVE-2021-28626)
* Server-Side Request Forgery vulnerability, which could allow for
security feature bypass. (CVE-2021-28627)
* Cross-site scripting vulnerability, which could allow for arbitrary
code execution. (CVE-2021-28628)

Adobe Creative Cloud
* Creation of Temporary File in Directory with Incorrect Permissions
vulnerability, which could allow for arbitrary file system write.
(CVE-2021-28633)
* Uncontrolled Search Path Element vulnerability, which could allow for
arbitrary code execution. (CVE-2021-28594)

Adobe RoboHelp
* Path Traversal vulnerability, which could allow for arbitrary code
execution. (CVE-2021-28588)

Adobe Photoshop Elements
* Creation of Temporary File in Directory with Incorrect Permissions
vulnerability, which could allow for privilege escalation (CVE-2021-28597)

Adobe Premiere Elements 
* Creation of Temporary File in Directory with Incorrect Permissions
vulnerability, which could allow for privilege escalation (CVE-2021-28623)

Adobe After Effects
* Out-of-bounds Read vulnerability, which could allow for memory leak
(CVE-2021-28600)
* NULL Pointer Dereference vulnerability, which could allow for
application denial-of-service (CVE-2021-28601)
* Access of Memory Location After End of Buffer vulnerability, which
could allow for arbitrary code execution (CVE-2021-28602,
CVE-2021-28605, CVE-2021-28607)
* Heap-based Buffer Overflow vulnerability, which could allow for
arbitrary code execution (CVE-2021-28603, CVE-2021-28604,
CVE-2021-28608, CVE-2021-28610)
* Stack-based Buffer Overflow vulnerability, which could allow for
arbitrary code execution (CVE-2021-28606)
* Out-of-bounds Read vulnerability, which could allow for arbitrary file
system read (CVE-2021-28609, CVE-2021-28615)
* Out-of-bounds Read vulnerability, which could allow for memory leak
(CVE-2021-28611, CVE-2021-28612, CVE-2021-28614, CVE-2021-28616)

Adobe Animate
* Out-of-bounds Read vulnerability, which could allow for arbitrary file
system read (CVE-2021-28630)
* Out-of-bounds Read vulnerability, which could allow for memory leak
(CVE-2021-28619)
* Out-of-bounds Read vulnerability, which could allow for information
disclosure (CVE-2021-28617, CVE-2021-28618)
* Out-of-bounds Read vulnerability, which could allow for arbitrary code
execution (CVE-2021-28621)
* Heap-based Buffer Overflow vulnerability, which could allow for
arbitrary code execution (CVE-2021-28620, CVE-2021-28629)
* Out-of-bounds Write vulnerability, which could allow for arbitrary
code execution (CVE-2021-28622)

Successful exploitation of the most severe of these vulnerabilities
could allow for arbitrary code execution. Depending on the privileges
associated with the user an attacker could then install programs; view,
change, or delete data; or create new accounts with full user rights.
Users whose accounts are configured to have fewer user rights on the
system could be less impacted than those who operate with administrative
user rights.

SYSTEM AFFECTED:
* Adobe Connect 11.2.1 and earlier versions
* Acrobat DC and Acrobat Reader DC version 2021.001.20155 and earlier
* Acrobat 2020 and Acrobat Reader 2020 version 2020.001.30025 and earlier
* Acrobat 2017 and Acrobat Reader 2017 version 2017.011.30196  and earlier
* Photoshop 2020 21.2.8 and earlier versions
* Photoshop 2021 22.4.1 and earlier versions
* Adobe Experience Manager (AEM) 6.5.8.0 and earlier versions
* Adobe Experience Manager (AEM) Cloud Services
* Creative Cloud Desktop Application (Installer) 2.4 and earlier version
* RoboHelp Server 2019.0.9 and earlier versions
* Photoshop Elements (installer) 5.2 and earlier versions
* Adobe Premiere Elements (installer) 5.2 and earlier versions     
* Adobe After Effects 18.2 and earlier versions
* Adobe Animate 21.0.6  and earlier versions

RECOMMENDATIONS:
We recommend the following actions be taken:
* Install the updates provided by Adobe immediately after appropriate
testing.
* Run all software as a non-privileged user (one without administrative
privileges) to diminish the effects of a successful attack.
* Remind users not to visit un-trusted websites or follow links provided
by unknown or un-trusted sources.
* Inform and educate users regarding the threats posed by hypertext
links contained in emails or attachments especially from un-trusted sources.
* Apply the Principle of Least Privilege to all systems and services.

REFERENCES:
https://helpx.adobe.com/security/products/connect/apsb21-36.html
https://helpx.adobe.com/security/products/acrobat/apsb21-37.html
https://helpx.adobe.com/security/products/photoshop/apsb21-38.html
https://helpx.adobe.com/security/products/experience-manager/apsb21-39.html
https://helpx.adobe.com/security/products/creative-cloud/apsb21-41.html
https://helpx.adobe.com/security/products/robohelp-server/apsb21-44.html
https://helpx.adobe.com/security/products/photoshop_elements/apsb21-46.html
https://helpx.adobe.com/security/products/premiere_elements/apsb21-47.html
https://helpx.adobe.com/security/products/after_effects/apsb21-49.html
https://helpx.adobe.com/security/products/animate/apsb21-50.html