CVEs-PoC/2021/CVE-2021-3177.md

CVE-2021-3177

Description

Python 3.x through 3.9.1 has a buffer overflow in PyCArg_repr in _ctypes/callproc.c, which may lead to remote code execution in certain Python applications that accept floating-point numbers as untrusted input, as demonstrated by a 1e300 argument to c_double.from_param. This occurs because sprintf is used unsafely.

POC

Reference

• https://bugs.python.org/issue42938
• https://news.ycombinator.com/item?id=26185005
• https://www.oracle.com//security-alerts/cpujul2021.html
• https://www.oracle.com/security-alerts/cpujan2022.html
• https://www.oracle.com/security-alerts/cpujul2022.html
• https://www.oracle.com/security-alerts/cpuoct2021.html

Github

• https://github.com/TAPAKAH20/python_dos_demo
• https://github.com/leveryd/leveryd
• https://github.com/tianocore/edk2-edkrepo