CVE-2019-14874 : Exploit Details and Defense Strategies

A vulnerability in the newlib libc library versions prior to 3.3.0 could lead to a null pointer dereference bug, impacting memory allocation.

Understanding CVE-2019-14874

In the __i2b function of the newlib libc library, a flaw exists in older versions that may result in a null pointer dereference bug.

What is CVE-2019-14874?

The vulnerability arises when Balloc fails to validate successful memory allocation, potentially causing a null pointer dereference bug when accessing _ x[0].

The Impact of CVE-2019-14874

The vulnerability has a CVSS base score of 6.5, with a medium severity rating. It poses a high availability impact but does not affect confidentiality or integrity.

Technical Details of CVE-2019-14874

The technical aspects of the vulnerability provide insight into its description, affected systems, and exploitation mechanism.

Vulnerability Description

The issue occurs in versions older than 3.3.0 of the newlib libc library, specifically in the __i2b function, due to inadequate memory allocation verification.

Affected Systems and Versions

Product: newlib
Vendor: Red Hat
Versions Affected: All newlib versions prior to 3.3.0

Exploitation Mechanism

The vulnerability can be exploited by triggering a null pointer dereference bug through the access of _ x[0] in case of a failed memory allocation.

Mitigation and Prevention

Protecting systems from CVE-2019-14874 involves immediate actions and long-term security practices.

Immediate Steps to Take

Update newlib to version 3.3.0 or newer to mitigate the vulnerability.
Monitor vendor security advisories for patches and updates.

Long-Term Security Practices

Implement secure coding practices to prevent similar memory-related vulnerabilities.
Conduct regular security assessments and audits to identify and address potential risks.

Patching and Updates

Apply patches provided by Red Hat for newlib to address the vulnerability and enhance system security.