PT-2021-2303 · Adobe · Acrobat Reader

Published 2021-02-09 · Updated 2021-09-14 · CVE-2021-21034

Positive Technologies (AI Summary)

CVSS v3.1

4.3

Medium

Base vector

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

Name of the Vulnerable Software and Affected Versions Adobe Acrobat Reader DC versions 2020.013.20074 and earlier Adobe Acrobat Reader DC versions 2020.001.30018 and earlier Adobe Acrobat Reader DC versions 2017.011.30188 and earlier

Description The issue is related to an out-of-bounds read vulnerability in Adobe Acrobat and Reader, allowing attackers to escalate privileges in the context of the current user. This can be achieved by leveraging a specially crafted PDF file, which requires user interaction to open the malicious file. An unauthenticated attacker could exploit this vulnerability to locally elevate privileges.

Recommendations For Adobe Acrobat Reader DC versions 2020.013.20074 and earlier, update to a version later than 2020.013.20074 to resolve the issue. For Adobe Acrobat Reader DC versions 2020.001.30018 and earlier, update to a version later than 2020.001.30018 to resolve the issue. For Adobe Acrobat Reader DC versions 2017.011.30188 and earlier, update to a version later than 2017.011.30188 to resolve the issue. As a temporary workaround, consider avoiding the use of Adobe Acrobat Reader DC to open PDF files from untrusted sources until a patch is available.

Fix

Out of bounds Read

Weakness Enumeration

CWE-125

Related Identifiers

BDU:2021-01537

CVE-2021-21034

ZDI-21-166

Affected Products

Acrobat Reader

References · 7

• https://zerodayinitiative.com/advisories/ZDI-21-166 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2021-21034 · Security Note
• https://bdu.fstec.ru/vul/2021-01537 · Security Note
• https://helpx.adobe.com/security/products/acrobat/apsb21-09.html · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2021-21034 · Vendor Advisory
• https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-21034 · Note
• https://t.me/cibsecurity/23485 · Telegram Post