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Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')

CVE-2021-33430

Medium
5.3/10

Summary

** DISPUTED ** A Buffer Overflow vulnerability exists in NumPy 1.9.x before 1.21.0rc1 in the 'PyArray_NewFromDescr_int' function of 'ctors.c' when specifying arrays of large dimensions (over 32) from Python code, which could let a malicious user cause a Denial of Service. NOTE: The vendor does not agree this is a vulnerability; In (very limited) circumstances a user may be able provoke the buffer overflow, the user is most likely already privileged to at least provoke denial of service by exhausting memory. Triggering this further requires the use of uncommon API (complicated structured dtypes), which is very unlikely to be available to an unprivileged user. SCA AppSec team researched the issue and found out that it is a security issue because indeed there was a misplaced validation that left an opening for the overflow to happen.

  • HIGH
  • NETWORK
  • NONE
  • UNCHANGED
  • NONE
  • LOW
  • NONE
  • HIGH

CWE-120 - Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')

The program copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer, leading to a buffer overflow.

References

Advisory Timeline

  • Published