CVE-2019-11923 : Security Advisory and Response

Mcrouter prior to version 0.41.0 is susceptible to a vulnerability that could lead to resource exhaustion or denial of service.

Understanding CVE-2019-11923

In Mcrouter versions earlier than v0.41.0, an issue in the ASCII parser could result in resource depletion or denial of service.

What is CVE-2019-11923?

The vulnerability in Mcrouter versions before v0.41.0 allowed the allocation of a buffer without enforcing a maximum length, potentially leading to resource exhaustion or denial of service.

The Impact of CVE-2019-11923

The vulnerability could be exploited to exhaust resources or trigger a denial of service condition, impacting the availability of the affected systems.

Technical Details of CVE-2019-11923

Mcrouter vulnerability details and affected systems.

Vulnerability Description

The ASCII parser in Mcrouter versions earlier than v0.41.0 allocated a buffer based on user input without limiting the maximum length, posing a risk of resource exhaustion or denial of service.

Affected Systems and Versions

Product: Mcrouter
Vendor: Facebook
Vulnerable Versions:
0.41.0
Versions less than 0.41.0 (custom)

Exploitation Mechanism

The vulnerability could be exploited by an attacker to cause resource depletion or trigger a denial of service by manipulating the length of the buffer.

Mitigation and Prevention

Protecting systems from CVE-2019-11923.

Immediate Steps to Take

Update Mcrouter to version 0.41.0 or newer to mitigate the vulnerability.
Implement network-level controls to filter out malicious traffic targeting the vulnerability.

Long-Term Security Practices

Regularly monitor and audit network traffic for any unusual patterns that could indicate exploitation attempts.
Train personnel on identifying and responding to potential denial of service attacks.

Patching and Updates

Apply security patches and updates provided by Facebook for Mcrouter to address the vulnerability effectively.