CVE-2021-33505 | Falco toctou

By Max On Jul 19, 2021

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.
4.4	$0-$5k	0.32

A vulnerability, which was classified as problematic, has been found in Falco up to 0.28.1. Affected by this issue is an unknown function. The manipulation with an unknown input leads to a race condition vulnerability. Using CWE to declare the problem leads to CWE-367. Impacted is confidentiality, integrity, and availability. CVE summarizes:

Falco through 0.28.1 has a Time-of-check Time-of-use (TOCTOU) Race Condition. Issue is fixed in Falco versions >= 0.29.1.

The weakness was shared 07/15/2021. This vulnerability is handled as CVE-2021-33505 since 05/21/2021. The exploitation is known to be difficult. The attack needs to approached within the local network. The successful exploitation requires a simple authentication. There are neither technical details nor an exploit publicly available.

Upgrading to version 0.29.1 eliminates this vulnerability. The upgrade is hosted for download at github.com.

Name

VulDB Meta Base Score: 4.6
VulDB Meta Temp Score: 4.4

VulDB Base Score: 4.6
VulDB Temp Score: 4.4
VulDB Vector: 🔒
VulDB Reliability: 🔍

AV	AC	Au	C	I	A
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Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍
Class: Race condition
CWE: CWE-367
ATT&CK: Unknown

Local: No
Remote: Partially

Availability: 🔒
Status: Not defined

Price Prediction: 🔍
Current Price Estimation: 🔒

0-Day	unlock	unlock	unlock	unlock
Today	unlock	unlock	unlock	unlock

Threat Intelligenceinfoedit

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Falco 0.29.1

05/21/2021 CVE assigned
07/15/2021 +55 days Advisory disclosed
07/15/2021 +0 days VulDB entry created
07/19/2021 +4 days VulDB last updateStatus: Confirmed