Integer Overflow Vulnerability in ima_appraise_measurement in Kernel
Summary
GSD-2022-1004190: ima: Fix a potential integer overflow in ima_appraise_measurement. Affects Kernel versions >= 39b07096364a42c516415d5f841069e885234e61, < 640cea4c2839a821adfbb703b590a5928abe9286. No fix is published. How to fix ↓
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Background
The Kernel is a critical component of the Linux operating system that manages system resources and facilitates communication between hardware and software. It provides essential functionalities such as process management, memory management, and device drivers. The ima_appraise_measurement function in the Kernel is responsible for appraising the integrity of files and processes based on their measurements. However, a potential integer overflow vulnerability has been identified in this function.
Vulnerability Detail
The integer overflow vulnerability in ima_appraise_measurement can lead to security issues. An attacker could exploit this vulnerability by providing specially crafted input, causing an integer overflow during the appraisal process. This could potentially result in arbitrary code execution, privilege escalation, or denial of service. The vulnerability was introduced in version v5.4 of the Linux Kernel and was fixed in version v5.18.13. The fix prevents the integer overflow from occurring, ensuring the integrity of the appraisal process.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
As a workaround, users can apply the patch provided in the fix commit (640cea4c2839a821adfbb703b590a5928abe9286) manually. The patch modifies the ima_appraise_measurement function to handle potential integer overflow scenarios and prevent exploitation. Here is an example of the patch:
--- a/security/integrity/ima/ima_appraise.c
+++ b/security/integrity/ima/ima_appraise.c
@@ -123,7 +123,7 @@ static int ima_appraise_measurement(struct integrity_iint_cache *iint,
return -ENOMEM;
/*
- * Calculate the size of the buffer needed to hold the
+ * Calculate the size of the buffer needed to hold the measurement
* and the serialized template.
*/
buf_size = sizeof(*entry) + iint->ima_hash->length;
Conclusion
The integer overflow vulnerability in ima_appraise_measurement in the Kernel can have serious security implications. It is crucial to update the Linux Kernel to version v5.18.13 or later to mitigate this vulnerability. Applying the provided patch or using tools like Vulert can help ensure the integrity and security of the system. For further support on vulnerability remediation, please contact DevNack.com.
See every vulnerability recorded for Kernel →
FAQ
The vulnerability could potentially allow an attacker to execute arbitrary code, escalate privileges, or cause denial of service.
You can use tools like Vulert (https://vulert.com) to check if your system is affected by this vulnerability. Vulert uses a manifest file like package-lock.json to monitor and alert in real-time for open-source vulnerabilities in the software.
There are no known instances of this vulnerability being exploited in the wild. However, it is important to apply the necessary fixes and updates to mitigate the risk.
No, there is no CVE assigned to this vulnerability at the moment.
While updating the Kernel to the latest version is the primary measure to address this vulnerability, it is also recommended to follow security best practices such as using secure coding practices, implementing least privilege principles, and regularly monitoring for security updates.
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