CVE-2020-24658: Buffer Overflow
First published: Thu Dec 24 2020(Updated: )
Arm Compiler 5 through 5.06u6 has an error in a stack protection feature designed to help spot stack-based buffer overflows in local arrays. When this feature is enabled, a protected function writes a guard value to the stack prior to (above) any vulnerable arrays in the stack. The guard value is checked for corruption on function return; corruption leads to an error-handler call. In certain circumstances, the reference value that is compared against the guard value is itself also written to the stack (after any vulnerable arrays). The reference value is written to the stack when the function runs out of registers to use for other temporary data. If both the reference value and the guard value are written to the stack, then the stack protection will fail to spot corruption when both values are overwritten with the same value. For both the reference value and the guard value to be corrupted, there would need to be both a buffer overflow and a buffer underflow in the vulnerable arrays (or some other vulnerability that causes two separated stack entries to be corrupted).
Credit: cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Arm Arm Compiler | >=5.01<5.06 | |
| Arm Arm Compiler | =5.06 | |
| Arm Arm Compiler | =5.06-update1 | |
| Arm Arm Compiler | =5.06-update2 | |
| Arm Arm Compiler | =5.06-update3 | |
| Arm Arm Compiler | =5.06-update4 | |
| Arm Arm Compiler | =5.06-update5 | |
| Arm Arm Compiler | =5.06-update6 | |
| Arm Arm Compiler | =5.06-update7 |
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Reference Links
Frequently Asked Questions
What is CVE-2020-24658?
CVE-2020-24658 is a vulnerability in Arm Compiler 5 through 5.06u6 that can be exploited to perform stack-based buffer overflows.
How does the stack protection feature work in Arm Compiler 5?
The stack protection feature in Arm Compiler 5 writes a guard value to the stack before vulnerable arrays to detect stack-based buffer overflows.
Which versions of Arm Compiler 5 are affected by CVE-2020-24658?
All versions of Arm Compiler 5 through 5.06u6 are affected by CVE-2020-24658.
What is the severity of CVE-2020-24658?
CVE-2020-24658 has a severity score of 7.8, which is considered high.
How can I fix the vulnerability in Arm Compiler 5?
To fix the vulnerability in Arm Compiler 5, it is recommended to update to a version that includes the patch for CVE-2020-24658.
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