CVE-2021-3177

2021-01-1906:15:12

Debian Security Bug Tracker

security-tracker.debian.org

python

buffer overflow

cve-2021-3177

remote code execution

sprintf

floating-point numbers

unix

CVSS2

7.5

Attack Vector

NETWORK

Attack Complexity

LOW

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

PARTIAL

AV:N/AC:L/Au:N/C:P/I:P/A:P

CVSS3

9.8

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS

0.031

Percentile

91.2%

JSON

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.

OSVersionArchitecturePackageVersionFilename
Debian11allpython2.7< 2.7.18-2python2.7_2.7.18-2_all.deb
Debian11allpython3.9< 3.9.1-3python3.9_3.9.1-3_all.deb