Dear Readers,
In this post, we will discuss an alarming security vulnerability documented under the title CVE-2024-0018. This particular vulnerability, identified in convertYUV420Planar16ToY410 of ColorConverter.cpp, can lead to a potential out of bounds write due to a heap buffer overflow. As a result, it may provide an attacker the power to escalate local privileges without obtaining any additional execution privileges. And, here's the real risk: NO user interaction is needed for this exploitation!
Let's take a deeper dive into the code snippet and references to understand this vulnerability, its potential risks, and how it can be exploited. But, first of all, we need to understand the function where this vulnerability lies.
convertYUV420Planar16ToY410 function
The convertYUV420Planar16ToY410 function is commonly used for transforming a YUV image (luma, chroma blue, and chroma red) to packed Y410 (also known as YUV 4:4:4). Being an essential image processing component, it is widely used for adjusting color and character data without causing any distortion.
Let's take a closer look at the code snippet where this vulnerability resides
void convertYUV420Planar16ToY410(const uint8_t *srcY,
const uint8_t *srcU,
const uint8_t *srcV,
uint8_t *dst,
const uint32_t width,
const uint32_t height) {
...
uint16_t y, u, v;
uint32_t y410;
for (j = ; j < height; ++j) {
for (i = ; i < width; ++i) {
...
y = *(const uint16_t *)(srcY + j * yStride + i * 2);
u = *(const uint16_t *)(srcU + (j / 2) * uvStride + (i / 2) * 2);
v = *(const uint16_t *)(srcV + (j / 2) * uvStride + (i / 2) * 2);
y410 = ((y << 6) & x000000000000000); // heap buffer overflow
...
*(uint32_t *)(dst + j * dstStride + i * 4) = y410;
}
}
}
As evident from the code snippet above, there is a potential out of bounds write when the 'y' variable is shifted using the '<<' bitwise left shift operator inside convertYUV420Planar16ToY410. This shift may lead to heap buffer overflow vulnerability, allowing local privilege escalation.
Original References
To get additional information about this vulnerability, please refer to the following authoritative sources:
1. CVE Details: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-0018
2. National Vulnerability Database (NVD): https://nvd.nist.gov/vuln/detail/CVE-2024-0018
Exploit Details
To exploit this vulnerability, an attacker can craft a malformed image containing the carefully manipulated values that can trigger the heap buffer overflow in convertYUV420Planar16ToY410. Once the function processes such a malformed image, it can create a condition where the attacker would have the opportunity to overwrite other memory segments. As a result, this can lead to local privilege escalation or even potential code execution within the context of the vulnerable process.
It's essential to note that no user interaction is needed for this exploitation, which significantly increases the severity of this vulnerability.
Conclusion
In conclusion, CVE-2024-0018 is a serious security vulnerability that exists within the convertYUV420Planar16ToY410 function of ColorConverter.cpp. This vulnerability can lead to local privilege escalation, allowing attackers to exploit the heap buffer overflow without any user interaction. It's essential for developers and maintainers to understand and account for such vulnerabilities, ensuring robust and secure software. To protect against this vulnerability, it's crucial to follow secure coding practices and stay informed about such potential risks. Stay secure, folks!
Timeline
Published on: 02/16/2024 20:15:47 UTC
Last modified on: 08/15/2024 18:35:05 UTC