In this post, we'll be discussing the details of a significant security vulnerability, CVE-2018-9463, which affects the sw49408_irq_runtime_engine_debug function found in touch_sw49408.c. An out-of-bounds write vulnerability exists in this function due to an incorrect bounds check, which, if exploited, could lead to a local escalation of privileges with System execution privileges needed. No user interaction is required for the exploitation of this vulnerability. To ensure a comprehensive understanding of the exploit, we'll delve into the code snippet, relevant references, and exploit details.

Code Snippet

The following code snippet is taken from the touch_sw49408.c file and demonstrates the source of the vulnerability:

static ssize_t sw49408_irq_runtime_engine_debug(struct device *dev,
    struct device_attribute *attr, char *buf)
{
    struct sw49408_driver_data *d = dev_get_drvdata(dev);
    int ret = ;
    u32 data[11];

    SW49408_INFO(d->pdev, "");
    ret = sw49408_reg_read(d->pdev, d->regs[SW49408_ENGINE_DEBUG],
               (u8 *)&data, sizeof(data));

    if (ret < )
        return ret;
   ...
}

In the above code snippet, the function sw49408_reg_read() is reading data from a hardware register and storing it in an array named "data". As we can see, the size of the "data" array is not appropriately checked, leading to a potential out-of-bounds write vulnerability.

1. The National Vulnerability Database (NVD) entry for CVE-2018-9463 offers more insights and details about the vulnerability: https://nvd.nist.gov/vuln/detail/CVE-2018-9463
2. The Android Security Bulletin from October 2018 includes this vulnerability along with other security issues: https://source.android.com/security/bulletin/2018-10-01

Exploit Details

The exploitation of the out-of-bounds write vulnerability in sw49408_irq_runtime_engine_debug of touch_sw49408.c is a potentially severe issue. Below are the key factors that make this vulnerability critical:

1. No User Interaction Required: The exploitation of this vulnerability does not require any user interaction. An attacker can potentially exploit the issue invisibly to the user, running malicious operations in the background.

2. Local Escalation of Privileges: This vulnerability can lead to a local escalation of privileges for the attacker, with System execution privileges needed. The attacker may use these escalated privileges to perform additional, unauthorized actions on the device, such as monitoring communications, capturing information, and tampering with the system.

3. Data Corruption: Due to the out-of-bounds write vulnerability, data stored on the device may be corrupted, making it inaccessible or lost. This could lead to a loss of sensitive information, affecting the confidentiality and availability of the data on the device.

To protect against the exploitation of this vulnerability, it is critical to apply all relevant security updates and patches for your device. Additionally, it is essential to keep track of the latest security developments, ensuring that your devices remain protected from ongoing threats.

Timeline

Published on: 12/05/2024 00:15:18 UTC
Last modified on: 12/05/2024 16:15:19 UTC