ASoC: ops: Reject out of bounds values in snd_soc_put_volsw() - Kernel
Summary
GSD-2022-1000651: ASoC: ops: Reject out of bounds values in snd_soc_put_volsw(). Affects Kernel versions < bb72d2dda85564c66d909108ea6903937a41679d. No fix is published. How to fix ↓
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Background
The Kernel is a fundamental component of the Linux operating system that provides core functionalities and interfaces with hardware devices. It acts as a bridge between the hardware and software layers, facilitating communication and resource management. The ASoC (Audio System on Chip) subsystem within the Kernel is responsible for handling audio-related operations and providing support for various audio codecs and devices. One of the functions in the ASoC subsystem, snd_soc_put_volsw(), is used to set the volume switch values for audio devices. However, a vulnerability has been discovered in this function that allows out of bounds values to be accepted, potentially leading to unexpected behavior or security issues.
Vulnerability Detail
The vulnerability in snd_soc_put_volsw() arises from a lack of proper input validation. When setting the volume switch values, the function fails to reject out of bounds values, allowing them to be accepted without any checks. This can result in various issues depending on the specific use case. For example, if the volume switch values control the amplification level, accepting out of bounds values could lead to excessive amplification, potentially damaging audio equipment or causing distortion. In a security context, accepting out of bounds values could be exploited to manipulate audio output or trigger buffer overflows, leading to potential code execution or privilege escalation.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
If updating the Kernel is not immediately feasible, a temporary workaround can be implemented by modifying the code in snd_soc_put_volsw() to include explicit checks for out of bounds values. Here is an example of how the code can be modified:
// Original code
if (value >= 0 && value <= max_value) {
// Set volume switch value
}
// Modified code
if (value >= 0 && value <= max_value) {
// Set volume switch value
} else {
// Reject out of bounds value
}
By adding the else block, any out of bounds value will be rejected and not processed further.
Conclusion
In conclusion, the ASoC function snd_soc_put_volsw() in the Kernel is vulnerable to accepting out of bounds values, which can have various consequences ranging from audio distortion to potential security issues. It is crucial to update the Kernel to version v5.16.8 or later to fix this vulnerability. If immediate updating is not possible, a temporary workaround can be implemented by modifying the code in snd_soc_put_volsw(). For further support and assistance in vulnerability remediation, please contact DevNack.com.
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FAQ
The impact of this vulnerability can vary depending on the specific use case. It could lead to audio distortion, damage to audio equipment, or even potential security issues such as code execution or privilege escalation.
You can use the Vulert Playground at Vulert Scanner to check if your system is affected by this vulnerability. Simply upload your package-lock.json file, and Vulert will analyze it for any open-source vulnerabilities, including this one.
Yes, a fix is available in Linux Kernel version v5.16.8. It is recommended to update the Kernel to this version or later to mitigate the vulnerability.
Yes, a temporary workaround is available. You can modify the code in snd_soc_put_volsw() to include explicit checks for out of bounds values. Please refer to the 'workaround' section for more details.
There are no known instances of this vulnerability being exploited in the wild. However, it is still important to apply the recommended fix or workaround to ensure the security and stability of your system.
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