VDB-170352 · CVE-2021-3405 · GCVE-0-2021-3405

libEBML up to 1.4.1 ReadData heap-based 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.
5.7	$0-$5k	0.00

Summaryinfo

A vulnerability classified as critical was found in libEBML up to 1.4.1. The affected element is the function EbmlString::ReadData/EbmlUnicodeString::ReadData. The manipulation results in heap-based overflow. This vulnerability is reported as CVE-2021-3405. No exploit exists. Upgrading the affected component is advised.

Detailsinfo

A vulnerability classified as critical has been found in libEBML up to 1.4.1. Affected is the function EbmlString::ReadData/EbmlUnicodeString::ReadData. The manipulation with an unknown input leads to a heap-based overflow vulnerability. CWE is classifying the issue as CWE-122. A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc(). This is going to have an impact on confidentiality, integrity, and availability.

The weakness was disclosed 02/24/2021. The advisory is shared for download at github.com. This vulnerability is traded as CVE-2021-3405. There are known technical details, but no exploit is available.

Upgrading to version 1.4.2 eliminates this vulnerability.

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Productinfo

Name

libEBML

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.0
VulDB Meta Temp Score: 5.9

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

NVD Base Score: 6.5
NVD Vector: 🔍

CVSSv2info

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Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Heap-based overflow
CWE: CWE-122 / CWE-119
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	Unlock	Unlock	Unlock	Unlock
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Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: libEBML 1.4.2

Timelineinfo

02/09/2021 🔍
02/24/2021 +15 days 🔍
02/24/2021 +0 days 🔍
03/04/2021 +8 days 🔍

Sourcesinfo

Advisory: github.com
Status: Confirmed

CVE: CVE-2021-3405 (🔍)
GCVE (CVE): GCVE-0-2021-3405
GCVE (VulDB): GCVE-100-170352

Entryinfo

Created: 02/24/2021 09:38
Updated: 03/04/2021 23:39
Changes: 02/24/2021 09:38 (37), 03/04/2021 23:33 (5), 03/04/2021 23:39 (18)
Complete: 🔍
Cache ID: 216::103