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Cyber Risk Series | Cloud Security Edition | February 28 | Register Now

Adobe security alert.

October 12, 2021

Advisory overview

Qualys Vulnerability R&D Lab has released new vulnerability checks in the Enterprise TruRisk Platform to protect organizations against 4 vulnerabilities that were fixed in 1 bulletins announced today by Adobe. Customers can immediately audit their networks for these and other new vulnerabilities by accessing their Qualys subscription. Visit Qualys Security Blog to prioritize remediation.

Non-Qualys customers can audit their network for these and other vulnerabilities by signing up for a Qualys Free Trial, or by trying Qualys Community Edition.

Vulnerability details

Adobe has released 1 security bulletins to fix newly discovered flaws in their software. Qualys has released the following checks for these new vulnerabilities:

  • Adobe Security Update for Adobe Acrobat and Adobe Reader (APSB21-104)

    Severity
    Serious 3
    Qualys ID
    375953
    Vendor Reference
    APSB21-104
    CVE Reference
    CVE-2021-40728, CVE-2021-40729, CVE-2021-40730, CVE-2021-40731
    CVSS Scores
    Base 6.8 / Temporal 5.6
    Description

    Adobe Reader and Acrobat are applications for handling PDF files. Adobe Reader and Acrobat are prone to multiple vulnerabilities that could potentially allow an attacker to take control of an affected system.

    Affected Versions:
    Acrobat DC Continuous 21.007.20095 and earlier versions(Windows )
    Acrobat Reader DC Continuous 21.007.20095 and earlier versions (Windows)
    Acrobat DC Continuous 21.007.20096 and earlier versions(MacOS)
    Acrobat Reader DC Continuous 21.007.20095 and earlier versions (MacOS )
    Acrobat 2020 Classic 2020, 20.004.30015 and earlier versions (Windows and macOS)
    Acrobat Reader 2020 Classic 2020,20.004.30015 and earlier versions (Windows and macOS)
    Acrobat 2017 Classic 2017, 17.011.30202 and earlier version (Windows and macOS)
    Acrobat Reader 2017 Classic 2017, 17.011.30202 and earlier version (Windows and macOS)

    QID Detection Logic (Authenticated):
    This QID looks for the vulnerable version of Acrobat.dll, AcroRd32.dll, and nppdf32.dll files.

    Consequence

    An attacker could exploit this vulnerability to compromise Confidentiality, Integrity and/or Availability.

    Solution

    Adobe has released fix to address this issue. Customers are advised to refer to APSB21-104 for updates pertaining to this vulnerability.

    Patches:
    The following are links for downloading patches to fix these vulnerabilities:
    APSB21-104

These new vulnerability checks are included in Qualys vulnerability signature 2.5.303-3. Each Qualys account is automatically updated with the latest vulnerability signatures as they become available. To view the vulnerability signature version in your account, from the Qualys Help menu, select the About tab.

Selective Scan Instructions Using Qualys

To perform a selective vulnerability scan, configure a scan profile to use the following options:

  1. Ensure access to TCP ports 135 and 139 are available.
  2. Enable Windows Authentication (specify Authentication Records).
  3. Enable the following Qualys IDs:
    • 375953
  4. If you would like the scan to return the Windows Hostname, also include QID 82044 and ensure access to UDP port 137 is available.
  5. If you would like to be notified if Qualys is unable to log on to a host (if Authentication fails), also include QID 105015.

In addition, prior to running a scan for these new vulnerabilities, you can estimate your exposure to these new threats by running the Risk Analysis Report, available from the Qualys Vulnerability Management Reports tab.

Access for Qualys Customers

Platforms and Platform Identification

Technical Support

For more information, customers may contact Qualys Technical Support.

About Qualys

The Enterprise TruRisk Platform and its integrated suite of security and compliance applications provides organizations of all sizes with a global view of their security and compliance solutions, while drastically reducing their total cost of ownership. Qualys solutions include: continuous monitoring, vulnerability management, policy compliance, PCI compliance, security assessment questionnaire, web application scanning, web application firewall, malware detection and SECURE Seal for security testing of web sites.