PT-2021-4267 · Yara+3 · Yara+3

Luis Merino · Published 2021-01-28 · Updated 2026-03-09 · CVE-2021-3402

Positive Technologies (AI Summary)

CVSS v3.1

9.1

Critical

Base vector

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

Name of the Vulnerable Software and Affected Versions YARA versions prior to 4.0.4

Description The issue is related to an integer overflow and several buffer overflow reads in the libyara/modules/macho/macho.c module of YARA. This could allow an attacker to cause denial of service or information disclosure via a malicious Mach-O file. The exploitation of this issue may enable a remote attacker to access confidential data and cause service disruption.

Recommendations For versions prior to 4.0.4, update to version 4.0.4 or later to resolve the issue. As a temporary workaround, consider restricting the use of the macho.c module until a patch is available. Avoid processing malicious or untrusted Mach-O files with affected versions of YARA to minimize the risk of exploitation.

Exploit

Fix

DoS

Integer Overflow

Weakness Enumeration

CWE-190

Related Identifiers

ALT-PU-2021-1172

BDU:2021-04875

CVE-2021-3402

ROSA-SA-2023-2226

USN-8080-1

Affected Products

Alt Linux

Linuxmint

Ubuntu

Yara

References · 33

• 🔥 https://x41-dsec.de/lab/advisories/x41-2021-001-yara · Exploit
• 🔥 https://openwall.com/lists/oss-security/2021/01/29/2 · Exploit
• https://osv.dev/vulnerability/USN-8080-1 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-3402 · Security Note
• https://ubuntu.com/security/CVE-2017-9304 · Vendor Advisory
• https://ubuntu.com/security/CVE-2017-8294 · Vendor Advisory
• https://ubuntu.com/security/CVE-2017-5924 · Vendor Advisory
• https://ubuntu.com/security/CVE-2018-19976 · Vendor Advisory
• https://ubuntu.com/security/CVE-2018-19974 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2021-3402 · Vendor Advisory
• https://bdu.fstec.ru/vul/2021-04875 · Security Note
• https://ubuntu.com/security/notices/USN-8080-1 · Vendor Advisory
• https://ubuntu.com/security/CVE-2021-3402 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2021-3402 · Vendor Advisory
• https://ubuntu.com/security/CVE-2018-19975 · Vendor Advisory