CVE-2021-3177

CWE-120 — Classic Buffer Overflow22 documents10 sources
Severity
9.8CRITICAL
EPSS
0.1%
top 78.13%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
8
Python PythonDebian Debian LinuxFedoraproject Fedora+5 more
Timeline
PublishedJan 19
Latest updateJul 11

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.

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HExploitability: 3.9 | Impact: 5.9

Affected Packages13 packages

▶Debianpython2.7< 2.7.18-2
▶Debianpython3.9< 3.9.1-3
▶Ubuntupython2.7< 2.7.12-1ubuntu0~16.04.18+8
▶Ubuntupython3.5< 3.5.2-2ubuntu0~16.04.13
▶Ubuntupython3.6< 3.6.9-1~18.04ubuntu1.4

Also affects: Debian Linux 9.0, Fedora 32, 33

Patches

Patch: bugs.python.org ↗Patch: github.com ↗Patch: python-security.readthedocs.io ↗

🔴Vulnerability Details

7
GHSA
GHSA-hc96-xw56-vfwh: Python 3↗2022-05-24
▶
OSV
python2.7 vulnerability↗2022-02-08
▶
OSV
python2.7 vulnerability↗2021-03-03
▶
OSV
python2.7, python3.4, python3.5, python3.6, python3.8 vulnerabilities↗2021-02-25
▶
OSV
python2.7 regression↗2021-02-25
▶

📋Vendor Advisories

13
Ubuntu
Python vulnerabilities↗2024-07-11
▶
Oracle
Oracle Oracle Communications Risk Matrix: CNE (Python) — CVE-2021-3177↗2022-07-15
▶
Ubuntu
Python vulnerability↗2022-02-08
▶
Oracle
Oracle Oracle Enterprise Manager Risk Matrix: Networking (Python) — CVE-2021-3177↗2022-01-15
▶
Oracle
Oracle Oracle Communications Applications Risk Matrix: Pricing (Python) — CVE-2021-3177↗2021-10-15
▶

💬Community

1
HackerOne
Buffer overflow in PyCArg_repr in _ctypes/callproc.c for Python 3.x to 3.9.1↗2021-08-25
▶