CVE-2021-3177 Memory corruption in n/a
A buffer overflow in Python's ctypes module allows remote code execution when processing untrusted floating-point numbers.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2021-3177?
CVE-2021-3177 is a critical memory corruption vulnerability in Debian Debian Linux, published on 19 Jan 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-120
Which versions are affected by CVE-2021-3177?
3 open source packages ship an affected version, including libpython, python and python-min. It affects 10 products.
| Package | Affected | Fixed in |
|---|---|---|
libpython Bitnami | All versions | 3.6.13, 3.7.10, 3.8.8, 3.9.2 |
python Bitnami | All versions | 3.6.13, 3.7.10, 3.8.8, 3.9.2 |
python-min Bitnami | All versions | 3.6.13, 3.7.10, 3.8.8, 3.9.2 |
Products include Debian Debian Linux, Fedoraproject Fedora, Netapp Active Iq Unified Manager, Netapp Ontap Select Deploy Administration Utility, Oracle Communications Cloud Native Core Network Function Cloud Native Environment, Oracle Communications Offline Mediation Controller and 4 more.
How do I fix CVE-2021-3177?
Upgrade libpython to a fixed version for your release line: 3.6.13, 3.7.10, 3.8.8 or 3.9.2.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2021-3177 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2021-3177 exists.
Other vulnerabilities in Debian Debian Linux
Sources
Also known as ALPINE-CVE-2021-3177, BIT-libpython-2021-3177, BIT-python-2021-3177, BIT-python-min-2021-3177, CLEANSTART-2026-FH60481, DEBIAN-CVE-2021-3177 and 8 more.