CVE-2021-29921
Publication date 6 May 2021
Last updated 24 July 2024
Ubuntu priority
In Python before 3,9,5, the ipaddress library mishandles leading zero characters in the octets of an IP address string. This (in some situations) allows attackers to bypass access control that is based on IP addresses.
Status
| Package | Ubuntu Release | Status |
|---|---|---|
| python2.7 | 24.04 LTS noble | Not in release |
| 22.04 LTS jammy |
Not affected
|
|
| 20.04 LTS focal |
Not affected
|
|
| 18.04 LTS bionic |
Not affected
|
|
| 16.04 LTS xenial |
Not affected
|
|
| 14.04 LTS trusty |
Not affected
|
|
| python3.10 | 24.04 LTS noble | Not in release |
| 22.04 LTS jammy |
Not affected
|
|
| 20.04 LTS focal | Not in release | |
| 18.04 LTS bionic | Not in release | |
| 16.04 LTS xenial | Not in release | |
| 14.04 LTS trusty | Not in release | |
| python3.4 | 24.04 LTS noble | Not in release |
| 22.04 LTS jammy | Not in release | |
| 20.04 LTS focal | Not in release | |
| 18.04 LTS bionic | Not in release | |
| 16.04 LTS xenial | Not in release | |
| 14.04 LTS trusty |
Not affected
|
|
| python3.5 | 24.04 LTS noble | Not in release |
| 22.04 LTS jammy | Not in release | |
| 20.04 LTS focal | Not in release | |
| 18.04 LTS bionic | Not in release | |
| 16.04 LTS xenial |
Not affected
|
|
| 14.04 LTS trusty |
Not affected
|
|
| python3.6 | 24.04 LTS noble | Not in release |
| 22.04 LTS jammy | Not in release | |
| 20.04 LTS focal | Not in release | |
| 18.04 LTS bionic |
Not affected
|
|
| 16.04 LTS xenial | Not in release | |
| 14.04 LTS trusty | Not in release | |
| python3.7 | 24.04 LTS noble | Not in release |
| 22.04 LTS jammy | Not in release | |
| 20.04 LTS focal | Not in release | |
| 18.04 LTS bionic |
Not affected
|
|
| 16.04 LTS xenial | Not in release | |
| 14.04 LTS trusty | Not in release | |
| python3.8 | 24.04 LTS noble | Not in release |
| 22.04 LTS jammy | Not in release | |
| 20.04 LTS focal |
Fixed 3.8.10-0ubuntu1~20.04.1
|
|
| 18.04 LTS bionic |
Fixed 3.8.0-3ubuntu1~18.04.2+esm2
|
|
| 16.04 LTS xenial | Not in release | |
| 14.04 LTS trusty | Not in release | |
| python3.9 | 24.04 LTS noble | Not in release |
| 22.04 LTS jammy | Not in release | |
| 20.04 LTS focal |
Fixed 3.9.5-3~20.04.1
|
|
| 18.04 LTS bionic | Not in release | |
| 16.04 LTS xenial | Not in release | |
| 14.04 LTS trusty | Not in release |
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mdeslaur
introduced in v3.8.0a4 This issue was re-introduced in python3.8 in focal because of the SRU in LP: #1928057
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score |
9.8 · Critical
|
| Attack vector | Network |
| Attack complexity | Low |
| Privileges required | None |
| User interaction | None |
| Scope | Unchanged |
| Confidentiality | High |
| Integrity impact | High |
| Availability impact | High |
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
References
Related Ubuntu Security Notices (USN)
- USN-4973-1
- Python vulnerability
- 1 June 2021
- USN-4973-2
- Python vulnerability
- 4 October 2021
- USN-6891-1
- Python vulnerabilities
- 11 July 2024
Other references
- https://github.com/python/cpython/pull/25099
- https://sick.codes/sick-2021-014
- https://python-security.readthedocs.io/vuln/ipaddress-ipv4-leading-zeros.html
- https://github.com/sickcodes
- https://github.com/sickcodes/security/blob/master/advisories/SICK-2021-014.md
- https://github.com/python/cpython/pull/12577
- https://docs.python.org/3/library/ipaddress.html
- https://github.com/python/cpython/blob/63298930fb531ba2bb4f23bc3b915dbf1e17e9e1/Misc/NEWS.d/3.8.0a4.rst
- https://www.cve.org/CVERecord?id=CVE-2021-29921