PT-2021-4003 · Adobe · Acrobat Reader

Published 2021-07-13 · Updated 2021-08-31 · CVE-2021-28634

Positive Technologies (AI Summary)

CVSS v2.0

8.5

High

Base vector

AV:N/AC:M/Au:S/C:C/I:C/A:C

Name of the Vulnerable Software and Affected Versions Acrobat Reader DC versions 2021.005.20054 and earlier Acrobat Reader DC versions 2020.004.30005 and earlier Acrobat Reader DC versions 2017.011.30197 and earlier

Description The issue is related to an Improper Neutralization of Special Elements used in an OS Command, which could allow an authenticated attacker to achieve arbitrary code execution on the host machine in the context of the current user. Exploitation of this issue requires user interaction, where a victim must open a malicious file.

Recommendations For Acrobat Reader DC versions 2021.005.20054 and earlier, update to a version later than 2021.005.20054 to resolve the issue. For Acrobat Reader DC versions 2020.004.30005 and earlier, update to a version later than 2020.004.30005 to resolve the issue. For Acrobat Reader DC versions 2017.011.30197 and earlier, update to a version later than 2017.011.30197 to resolve the issue. As a temporary workaround, consider avoiding the opening of malicious files to minimize the risk of exploitation.

Fix

OS Command Injection

Weakness Enumeration

CWE-78

Related Identifiers

BDU:2021-04527

CVE-2021-28634

Affected Products

Acrobat Reader

References · 8

• https://osv.dev/vulnerability/CVE-2021-28634 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-28634 · Security Note
• https://bdu.fstec.ru/vul/2021-04527 · Security Note
• https://helpx.adobe.com/security/products/acrobat/apsb21-51.html · Vendor Advisory
• https://vuldb.com/?id.178496 · Note
• https://t.me/cibsecurity/27658 · Telegram Post
• https://t.me/cvenotify/20434 · Telegram Post
• https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-28634 · Note