CVE-2018-5899 : Exploit Details and Defense Strategies

Android releases from CAF using the Linux kernel (such as Android for MSM, Firefox OS for MSM, QRD Android) before the security patch level of 2018-06-05 are vulnerable to a use-after-free issue when establishing a TDLS connection.

Understanding CVE-2018-5899

Prior to the security patch level of 2018-06-05, a use-after-free vulnerability arises in Android releases from CAF with the Linux kernel due to incorrect handling of netbufs.

What is CVE-2018-5899?

Vulnerability Type: Use After Free in WLAN
Vendor: Qualcomm, Inc.
Affected Versions: All Android releases from CAF using the Linux kernel

The Impact of CVE-2018-5899

The vulnerability allows attackers to potentially execute arbitrary code or cause a denial of service by exploiting the use-after-free issue.

Technical Details of CVE-2018-5899

Vulnerability Description

The issue occurs when netbufs are freed in ol_tx_completion_handler but are still accessed in NBUF_UPDATE_TX_PKT_COUNT.

Affected Systems and Versions

Products: Android for MSM, Firefox OS for MSM, QRD Android
Versions: All Android releases from CAF using the Linux kernel

Exploitation Mechanism

Attackers can exploit this vulnerability by manipulating the freed netbufs to execute malicious code or disrupt system functionality.

Mitigation and Prevention

Immediate Steps to Take

Apply the security patch level of 2018-06-05 or later to mitigate the vulnerability.
Monitor network traffic for any suspicious activities that could indicate exploitation attempts.

Long-Term Security Practices

Regularly update and patch systems to address known vulnerabilities and enhance overall security posture.
Implement network segmentation and access controls to limit the impact of potential attacks.

Patching and Updates

Stay informed about security bulletins and updates from Qualcomm and Android to promptly address any new vulnerabilities or patches.