Denial of service in Python
| Risk | Medium |
| Patch available | YES |
| Number of vulnerabilities | 1 |
| CVE-ID | CVE-2020-8492 |
| CWE-ID | CWE-399 |
| Exploitation vector | Network |
| Public exploit | Public exploit code for vulnerability #1 is available. |
| Vulnerable software Subscribe |
Python Universal components / Libraries / Scripting languages |
| Vendor | Python.org |
Security Bulletin
This security bulletin contains one medium risk vulnerability.
1) Resource management error
EUVDB-ID: #VU25631
Risk: Medium
CVSSv3.1: 4.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:N/A:L/E:P/RL:U/RC:C]
CVE-ID: CVE-2020-8492
CWE-ID:
CWE-399 - Resource Management Errors
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to improper input validation in urllib.request.AbstractBasicAuthHandler when processing HTTP responses. A remote attacker who controls a HTTP server can send a specially crafted HTTP response to the client application and conduct Regular Expression Denial of Service (ReDoS) attack.
MitigationInstall update from vendor's website.
Vulnerable software versionsPython: 2.7.0 - 3.8.2
External linkshttp://bugs.python.org/issue39503
http://github.com/python/cpython/pull/18284
http://python-security.readthedocs.io/vuln/urllib-basic-auth-regex.html
http://security.netapp.com/advisory/ntap-20200221-0001/
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability. However, proof of concept for this vulnerability is available.
