Use After Free Affecting scipy package, versions [,1.8.0)


Severity

Recommended
0.0
high
0
10

CVSS assessment by Snyk's Security Team. Learn more

Threat Intelligence

Exploit Maturity
Proof of Concept
EPSS
1.11% (62nd percentile)

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  • Snyk IDSNYK-PYTHON-SCIPY-5759266
  • published7 Jul 2023
  • disclosed7 Jul 2023
  • creditElla Ma

Introduced: 7 Jul 2023

CVE-2023-29824  (opens in a new tab)
CWE-416  (opens in a new tab)

How to fix?

Upgrade scipy to version 1.8.0 or higher.

Overview

Affected versions of this package are vulnerable to Use After Free via the Py_FindObjects() function.

Note:

According to the maintainer, this issue is not to be considered a vulnerability.

PoC

void f() {
  PyObject *result = PyList_New(1); // <-- new reference returned (line 878)
  assert(result);
  printf("%ld\n", result->ob_refcnt); // 1

  PyErr_NoMemory(); // <-- error happens, an exception is thrown (line 890)
  Py_XDECREF(result); // <-- destruction here (line 924)
  printf("%ld\n", result->ob_refcnt); // 0

  if (PyErr_Occurred()) {
    Py_XDECREF(result); // <-- use after free here (line 931)
    printf("%ld\n", result->ob_refcnt); // -1
  }
}

CVSS Base Scores

version 3.1