PT-2021-4905 · Adobe · Acrobat Reader

Published 2021-09-14 · Updated 2022-02-01 · CVE-2021-35982

Positive Technologies (AI Summary)

CVSS v3.1

7.3

High

Base vector

AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H

Name of the Vulnerable Software and Affected Versions Adobe Acrobat Reader DC versions 2021.005.20060 and earlier Adobe Acrobat Reader DC versions 2020.004.30006 and earlier Adobe Acrobat Reader DC versions 2017.011.30199 and earlier

Description The issue is related to an Uncontrolled Search Path Element vulnerability, which can be exploited by a local attacker with non-administrative privileges to achieve arbitrary code execution in the context of the current user via DLL hijacking. This requires user interaction, such as opening a specially crafted PDF file. The vulnerability is associated with an unsafe procedure for searching paths to DLL libraries.

Recommendations For Adobe Acrobat Reader DC versions 2021.005.20060 and earlier, update to a version later than 2021.005.20060 to resolve the issue. For Adobe Acrobat Reader DC versions 2020.004.30006 and earlier, update to a version later than 2020.004.30006 to resolve the issue. For Adobe Acrobat Reader DC versions 2017.011.30199 and earlier, update to a version later than 2017.011.30199 to resolve the issue. As a temporary workaround, consider restricting the use of DLL libraries to minimize the risk of exploitation.

Fix

Uncontrolled Search Path Element

Weakness Enumeration

CWE-427

Related Identifiers

BDU:2021-05640

CVE-2021-35982

Affected Products

Acrobat Reader

References · 7

• https://nvd.nist.gov/vuln/detail/CVE-2021-35982 · Security Note
• https://helpx.adobe.com/security/products/acrobat/apsb21-55.html · Vendor Advisory
• https://bdu.fstec.ru/vul/2021-05640 · Security Note
• https://safe-surf.ru/specialists/bulletins-nkcki/669565 · Security Note
• https://osv.dev/vulnerability/CVE-2021-35982 · Vendor Advisory
• https://t.me/cvenotify/22157 · Telegram Post
• https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-35982 · Note