CVE-2023-5173 : Security Advisory and Response

This CVE record was assigned by Mozilla and was published on September 27, 2023. It involves an integer overflow vulnerability in Firefox that could lead to an out-of-bounds write to privileged process memory under certain conditions.

Understanding CVE-2023-5173

This section will provide insight into the nature of CVE-2023-5173 and its impact on affected systems.

What is CVE-2023-5173?

CVE-2023-5173 is an integer overflow vulnerability in Firefox that could occur in a non-standard configuration of the browser, particularly when influenced by network traffic, potentially due to a local unprivileged webpage. The vulnerability leads to an out-of-bounds write to privileged process memory. It is important to note that this bug only affects Firefox if a non-standard preference allowing non-HTTPS Alternate Services (

network.http.altsvc.oe

) is enabled. The vulnerability affects Firefox versions below 118.

The Impact of CVE-2023-5173

The impact of this vulnerability is significant as it could allow an attacker to execute arbitrary code or cause a denial of service by exploiting the out-of-bounds write to privileged process memory.

Technical Details of CVE-2023-5173

Delve into the technical aspects of CVE-2023-5173 to understand the vulnerability better and how it can be exploited.

Vulnerability Description

The vulnerability stems from an integer overflow in Firefox, triggered by network traffic in a non-standard configuration, potentially allowing an out-of-bounds write to privileged process memory.

Affected Systems and Versions

The vulnerability affects Firefox versions below 118, particularly in instances where the non-standard preference for non-HTTPS Alternate Services is enabled.

Exploitation Mechanism

The exploitation of this vulnerability may involve an attacker leveraging a local unprivileged webpage to trigger the integer overflow, leading to unauthorized access to privileged process memory.

Mitigation and Prevention

Explore the necessary steps to mitigate the risks associated with CVE-2023-5173 and prevent potential exploitation.

Immediate Steps to Take

Users are advised to update their Firefox browser to version 118 or later to mitigate the risk of exploitation related to this vulnerability. Disabling the non-standard preference for non-HTTPS Alternate Services (

network.http.altsvc.oe

) is also recommended.

Long-Term Security Practices

To enhance overall cybersecurity posture, users and organizations are encouraged to follow best security practices, such as regularly updating software, employing network security measures, and maintaining awareness of potential threats.

Patching and Updates

Mozilla has likely released patches to address CVE-2023-5173. It is crucial for users to promptly apply these patches and stay vigilant for future security updates to protect against emerging threats.