CVE-2019-14876 Explained : Impact and Mitigation

A vulnerability in the newlib libc library prior to version 3.3.0 can lead to a null pointer dereference bug, impacting the __lshift function.

Understanding CVE-2019-14876

This CVE involves a lack of validation check in the allocation of a big integer in the newlib libc library, potentially resulting in a null pointer dereference.

What is CVE-2019-14876?

The vulnerability in the __lshift function of newlib libc library, versions before 3.3.0, allows a null pointer dereference due to inadequate memory allocation validation.

The Impact of CVE-2019-14876

The vulnerability can lead to a null pointer dereference bug, affecting the stability and security of systems utilizing the newlib library.

Technical Details of CVE-2019-14876

The technical aspects of the vulnerability provide insight into its nature and potential exploitation.

Vulnerability Description

The issue arises from the lack of validation in the allocation of a big integer using Balloc, leading to a null pointer dereference in case of memory allocation failure.

Affected Systems and Versions

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

Exploitation Mechanism

The vulnerability can be exploited by triggering a memory allocation failure, resulting in a null pointer dereference when accessing b1.

Mitigation and Prevention

Effective mitigation strategies are crucial to address and prevent the exploitation of CVE-2019-14876.

Immediate Steps to Take

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

Long-Term Security Practices

Implement secure coding practices to validate memory allocations and prevent null pointer dereferences.
Regularly assess and update software libraries to ensure the latest security patches are applied.

Patching and Updates

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