VDB-175229 · CVE-2021-3402 · GCVE-0-2021-3402

YARA up to 4.0.3 Mach-O File macho.c buffer overflow

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
5.3	$0-$5k	0.00

Summaryinfo

A vulnerability was found in YARA up to 4.0.3. It has been classified as critical. Affected is an unknown function of the file libyara/modules/macho/macho.c of the component Mach-O File Handler. The manipulation leads to buffer overflow. This vulnerability is traded as CVE-2021-3402. There is no exploit available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in YARA up to 4.0.3. It has been rated as critical. This issue affects an unknown code block of the file libyara/modules/macho/macho.c of the component Mach-O File Handler. The manipulation with an unknown input leads to a buffer overflow vulnerability. Using CWE to declare the problem leads to CWE-120. The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer, leading to a buffer overflow. Impacted is confidentiality, integrity, and availability.

The weakness was shared 05/15/2021. The advisory is shared at bugzilla.redhat.com. The identification of this vulnerability is CVE-2021-3402. Technical details are known, but no exploit is available.

Upgrading to version 4.0.4 eliminates this vulnerability.

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Productinfo

Name

YARA

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.5
VulDB Meta Temp Score: 5.3

VulDB Base Score: 5.5
VulDB Temp Score: 5.3
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock

VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Buffer overflow
CWE: CWE-120 / CWE-119
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Partially

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: YARA 4.0.4

Timelineinfo

02/08/2021 🔍
05/15/2021 +95 days 🔍
05/15/2021 +0 days 🔍
05/20/2021 +4 days 🔍

Sourcesinfo

Advisory: bugzilla.redhat.com
Status: Confirmed

CVE: CVE-2021-3402 (🔍)
GCVE (CVE): GCVE-0-2021-3402
GCVE (VulDB): GCVE-100-175229

Entryinfo

Created: 05/15/2021 18:29
Updated: 05/20/2021 01:46
Changes: 05/15/2021 18:29 (38), 05/20/2021 01:46 (5)
Complete: 🔍
Cache ID: 216::103