CVE-2021-3177 : Python 3.x through 3.9.1 has a buffer overflow in PyCArg_repr in

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.

Published 2021-01-19 06:15:13

Updated 2023-05-24 21:15:10

Source MITRE

View at NVD, CVE.org

Vulnerability category: OverflowExecute code

Products affected by CVE-2021-3177

Debian » Debian Linux » Version: 9.0
cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
Matching versions
Oracle » Enterprise Manager Ops Center » Version: 12.4.0.0
cpe:2.3:a:oracle:enterprise_manager_ops_center:12.4.0.0:*:*:*:*:*:*:*
Matching versions
Oracle » Communications Pricing Design Center » Version: 12.0.0.3.0
cpe:2.3:a:oracle:communications_pricing_design_center:12.0.0.3.0:*:*:*:*:*:*:*
Matching versions
Oracle » Zfs Storage Appliance Kit » Version: 8.8
cpe:2.3:a:oracle:zfs_storage_appliance_kit:8.8:*:*:*:*:*:*:*
Matching versions
Oracle » Communications Offline Mediation Controller » Version: 12.0.0.3.0
cpe:2.3:a:oracle:communications_offline_mediation_controller:12.0.0.3.0:*:*:*:*:*:*:*
Matching versions
Oracle » Communications Cloud Native Core Network Function Cloud Native Environment » Version: 22.2.0
cpe:2.3:a:oracle:communications_cloud_native_core_network_function_cloud_native_environment:22.2.0:*:*:*:*:*:*:*
Matching versions
Fedoraproject » Fedora » Version: 32
cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:*
Matching versions
Fedoraproject » Fedora » Version: 33
cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*
Matching versions
Netapp » Ontap Select Deploy Administration Utility » Version: N/A
cpe:2.3:a:netapp:ontap_select_deploy_administration_utility:-:*:*:*:*:*:*:*
Matching versions
Netapp » Active Iq Unified Manager » Version: N/A For Vmware Vsphere
cpe:2.3:a:netapp:active_iq_unified_manager:-:*:*:*:*:vmware_vsphere:*:*
Matching versions
Netapp » Active Iq Unified Manager » Version: N/A For Windows
cpe:2.3:a:netapp:active_iq_unified_manager:-:*:*:*:*:windows:*:*
Matching versions
Python » Python
Versions from including (>=) 3.8.0 and up to, including, (<=) 3.8.7
cpe:2.3:a:python:python:*:*:*:*:*:*:*:*
Matching versions
Python » Python
Versions from including (>=) 3.7.0 and up to, including, (<=) 3.7.9
cpe:2.3:a:python:python:*:*:*:*:*:*:*:*
Matching versions
Python » Python
Versions from including (>=) 3.6.0 and up to, including, (<=) 3.6.12
cpe:2.3:a:python:python:*:*:*:*:*:*:*:*
Matching versions
Python » Python
Versions from including (>=) 3.9.0 and up to, including, (<=) 3.9.1
cpe:2.3:a:python:python:*:*:*:*:*:*:*:*
Matching versions

Threat overview for CVE-2021-3177

Top countries where our scanners detected CVE-2021-3177

Top open port discovered on systems with this issue 80

IPs affected by CVE-2021-3177 260,773

Threat actors abusing to this issue? Yes

Find out if you^* are affected by CVE-2021-3177!

^*Directly or indirectly through your vendors, service providers and 3rd parties. Powered by attack surface intelligence from SecurityScorecard.

Exploit prediction scoring system (EPSS) score for CVE-2021-3177

EPSS FAQ

0.03%

Probability of exploitation activity in the next 30 days EPSS Score History

~ 8 %

Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2021-3177

Base Score	Base Severity	CVSS Vector	Exploitability Score	Impact Score	Score Source
7.5	HIGH	AV:N/AC:L/Au:N/C:P/I:P/A:P	10.0	6.4	NIST
Access Vector: Network Access Complexity: Low Authentication: None Confidentiality Impact: Partial Integrity Impact: Partial Availability Impact: Partial
9.8	CRITICAL	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H	3.9	5.9	NIST
Attack Vector: Network Attack Complexity: Low Privileges Required: None User Interaction: None Scope: Unchanged Confidentiality: High Integrity: High Availability: High

CWE ids for CVE-2021-3177

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

The product 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.

Assigned by: nvd@nist.gov (Primary)

References for CVE-2021-3177

https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/NODWHDIFBQE5RU5PUWUVE47JOT5VCMJ2/

[SECURITY] Fedora 33 Update: python3.7-3.7.10-1.fc33 - package-announce - Fedora Mailing-Lists
Third Party Advisory

CVEs referencing this url
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/FONHJIOZOFD7CD35KZL6SVBUTMBPGZGA/

[SECURITY] Fedora 32 Update: python37-3.7.10-1.fc32 - package-announce - Fedora Mailing-Lists
Third Party Advisory

CVEs referencing this url
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/NQPARTLNSFQVMMQHPNBFOCOZOO3TMQNA/

[SECURITY] Fedora 33 Update: python3.8-3.8.7-2.fc33 - package-announce - Fedora Mailing-Lists
Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/BRHOCQYX3QLDGDQGTWQAUUT2GGIZCZUO/

[SECURITY] Fedora 32 Update: mingw-python3-3.8.3-8.fc32 - package-announce - Fedora Mailing-Lists
Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/CCFZMVRQUKCBQIG5F2CBVADK63NFSE4A/

[SECURITY] Fedora 33 Update: mingw-python3-3.9.1-2.fc33 - package-announce - Fedora Mailing-Lists
Third Party Advisory
https://lists.debian.org/debian-lts-announce/2023/05/msg00024.html

[SECURITY] [DLA 3432-1] python2.7 security update

CVEs referencing this url
https://www.oracle.com//security-alerts/cpujul2021.html

Oracle Critical Patch Update Advisory - July 2021
Patch;Third Party Advisory

CVEs referencing this url
https://www.oracle.com/security-alerts/cpujan2022.html

Oracle Critical Patch Update Advisory - January 2022
Patch;Third Party Advisory

CVEs referencing this url
https://lists.debian.org/debian-lts-announce/2021/04/msg00005.html

[SECURITY] [DLA 2619-1] python3.5 security update
Mailing List;Third Party Advisory

CVEs referencing this url
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/Z7GZV74KM72O2PEJN2C4XP3V5Q5MZUOO/

[SECURITY] Fedora 32 Update: python39-3.9.1-2.fc32 - package-announce - Fedora Mailing-Lists
Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/MP572OLHMS7MZO4KUPSCIMSZIA5IZZ62/

[SECURITY] Fedora 32 Update: python36-3.6.13-1.fc32 - package-announce - Fedora Mailing-Lists
Third Party Advisory

CVEs referencing this url
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/V6XJAULOS5JVB2L67NCKKMJ5NTKZJBSD/

[SECURITY] Fedora 33 Update: python3.10-3.10.0~a5-1.fc33 - package-announce - Fedora Mailing-Lists
Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/Y4KSYYWMGAKOA2JVCQA422OINT6CKQ7O/

[SECURITY] Fedora 32 Update: python27-2.7.18-8.fc32 - package-announce - Fedora Mailing-Lists
Third Party Advisory
https://github.com/python/cpython/pull/24239

closes bpo-42938: Replace snprintf with Python unicode formatting in ctypes param reprs. by benjaminp · Pull Request #24239 · python/cpython · GitHub
Patch;Third Party Advisory
https://bugs.python.org/issue42938

Issue 42938: [security] ctypes double representation BoF - Python tracker
Exploit;Issue Tracking;Patch;Vendor Advisory
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/FPE7SMXYUIWPOIZV4DQYXODRXMFX3C5E/

[SECURITY] Fedora 32 Update: python3.10-3.10.0~a5-1.fc32 - package-announce - Fedora Mailing-Lists
Third Party Advisory
https://lists.debian.org/debian-lts-announce/2022/02/msg00013.html

[SECURITY] [DLA 2919-1] python2.7 security update
Mailing List;Third Party Advisory
https://lists.apache.org/thread.html/rf9fa47ab66495c78bb4120b0754dd9531ca2ff0430f6685ac9b07772@%3Cdev.mina.apache.org%3E

[jira] [Created] (FTPSERVER-500) Security vulnerability in common/lib/log4j-1.2.17.jar - Pony Mail
Mailing List;Third Party Advisory

CVEs referencing this url
https://security.gentoo.org/glsa/202101-18

Python: Multiple vulnerabilities (GLSA 202101-18) — Gentoo security
Third Party Advisory

CVEs referencing this url
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/NXSMBHES3ANXXS2RSO5G6Q24BR4B2PWK/

[SECURITY] Fedora 32 Update: python3-3.8.7-2.fc32 - package-announce - Fedora Mailing-Lists
Third Party Advisory
https://www.oracle.com/security-alerts/cpuoct2021.html

Oracle Critical Patch Update Advisory - October 2021
Patch;Third Party Advisory

CVEs referencing this url
https://news.ycombinator.com/item?id=26185005

Python 3.x: RCE in Python applications that accept floats as untrusted input | Hacker News
Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/YDTZVGSXQ7HR7OCGSUHTRNTMBG43OMKU/

[SECURITY] Fedora 33 Update: python2.7-2.7.18-8.fc33 - package-announce - Fedora Mailing-Lists
Third Party Advisory
https://python-security.readthedocs.io/vuln/ctypes-buffer-overflow-pycarg_repr.html

ctypes: Buffer overflow in PyCArg_repr — Python Security 0.0 documentation
Patch;Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/HCQTCSP6SCVIYNIRUJC5X7YBVUHPLSC4/

[SECURITY] Fedora 33 Update: python3.6-3.6.13-1.fc33 - package-announce - Fedora Mailing-Lists
Third Party Advisory

CVEs referencing this url
https://www.oracle.com/security-alerts/cpujul2022.html

Oracle Critical Patch Update Advisory - July 2022
Patch;Third Party Advisory

CVEs referencing this url
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/MGSV6BJQLRQ6RKVUXK7JGU7TP4QFGQXC/

[SECURITY] Fedora 33 Update: python3.9-3.9.1-2.fc33 - package-announce - Fedora Mailing-Lists
Third Party Advisory
https://security.netapp.com/advisory/ntap-20210226-0003/

CVE-2021-3177 Python Vulnerability in NetApp Products | NetApp Product Security
Third Party Advisory