Out-of-Bounds Affecting gcc package, versions [0,]
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-UNMANAGED-GCC-5898488
- published13 Sept 2023
- disclosed12 Sept 2023
- creditTom Hebb, Azeria-labs
Introduced: 12 Sep 2023
CVE-2023-4039 (opens in a new tab)How to fix?
There is no fixed version for gcc.
Overview
Affected versions of this package are vulnerable to Out-of-Bounds. On AArch64 targets, GCC's stack smashing protection does not detect or defend against overflows of dynamically sized local variables.
PoC
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
int main(int argc, char **argv) {
if (argc != 2)
return 1;
// Variable-length array
uint8_t input[atoi(argv[1])];
size_t n = fread(input, 1, 4096, stdin);
fwrite(input, 1, n, stdout);
return 0;
}