canonical ubuntu-linux CVE-2021-1405 vulnerability in Canonical and Other Products
Published on April 8, 2021

Clam AntiVirus (ClamAV) PDF Parser Denial of Service Vulnerability

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A vulnerability in the email parsing module in Clam AntiVirus (ClamAV) Software version 0.103.1 and all prior versions could allow an unauthenticated, remote attacker to cause a denial of service condition on an affected device. The vulnerability is due to improper variable initialization that may result in an NULL pointer read. An attacker could exploit this vulnerability by sending a crafted email to an affected device. An exploit could allow the attacker to cause the ClamAV scanning process crash, resulting in a denial of service condition.

Vendor Advisory Vendor Advisory NVD

Vulnerability Analysis

CVE-2021-1405 can be exploited with network access, and does not require authorization privileges or user interaction. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality and integrity, and a high impact on availability.

Attack Vector:
NETWORK
Attack Complexity:
LOW
Privileges Required:
NONE
User Interaction:
NONE
Scope:
UNCHANGED
Confidentiality Impact:
NONE
Integrity Impact:
NONE
Availability Impact:
HIGH

Weakness Type

What is a Classic Buffer Overflow Vulnerability?

The program 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. A buffer overflow condition exists when a program attempts to put more data in a buffer than it can hold, or when a program attempts to put data in a memory area outside of the boundaries of a buffer. The simplest type of error, and the most common cause of buffer overflows, is the "classic" case in which the program copies the buffer without restricting how much is copied. Other variants exist, but the existence of a classic overflow strongly suggests that the programmer is not considering even the most basic of security protections.

CVE-2021-1405 has been classified to as a Classic Buffer Overflow vulnerability or weakness.


Products Associated with CVE-2021-1405

You can be notified by email with stack.watch whenever vulnerabilities like CVE-2021-1405 are published in these products:

Canonical Ubuntu Linux
 
Clamav
 
Debian Linux
 
Cisco Clamav
 

Affected Versions

Cisco ClamAV:

Exploit Probability

EPSS
1.49%
Percentile
80.85%

EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.