Ubuntu.comUB:CVE-2021-29921CVE-2021-29921
9.8 High
CVSS3
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
7.5 High
CVSS2
Access Vector
NETWORK
Access 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
0.008 Low
EPSS
Percentile
81.4%
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.
Bugs
Notes
| Author | Note |
|---|---|
| mdeslaur | introduced in v3.8.0a4 This issue was re-introduced in python3.8 in focal because of the SRU in LP: #1928057 |
| OS | Version | Architecture | Package | Version | Filename |
|---|---|---|---|---|---|
| ubuntu | 21.04 | noarch | python3.10 | < 3.10.0~b1-3~21.04 | UNKNOWN |
| ubuntu | 18.04 | noarch | python3.8 | < any | UNKNOWN |
| ubuntu | 20.04 | noarch | python3.8 | < 3.8.10-0ubuntu1~20.04.1 | UNKNOWN |
| ubuntu | 20.10 | noarch | python3.8 | < 3.8.6-1ubuntu0.3 | UNKNOWN |
| ubuntu | 20.04 | noarch | python3.9 | < 3.9.5-3~20.04.1 | UNKNOWN |
| ubuntu | 20.10 | noarch | python3.9 | < 3.9.5-3~20.10.1 | UNKNOWN |
| ubuntu | 21.04 | noarch | python3.9 | < 3.9.5-3~21.04 | UNKNOWN |
| ubuntu | 21.10 | noarch | python3.9 | < 3.9.5-2ubuntu1 | UNKNOWN |
References
docs.python.org/3/library/ipaddress.html
github.com/python/cpython/blob/63298930fb531ba2bb4f23bc3b915dbf1e17e9e1/Misc/NEWS.d/3.8.0a4.rst
github.com/python/cpython/pull/12577
github.com/python/cpython/pull/25099
github.com/sickcodes
github.com/sickcodes/security/blob/master/advisories/SICK-2021-014.md
launchpad.net/bugs/cve/CVE-2021-29921
nvd.nist.gov/vuln/detail/CVE-2021-29921
python-security.readthedocs.io/vuln/ipaddress-ipv4-leading-zeros.html
security-tracker.debian.org/tracker/CVE-2021-29921
sick.codes/sick-2021-014
ubuntu.com/security/notices/USN-4973-1
ubuntu.com/security/notices/USN-4973-2
www.cve.org/CVERecord?id=CVE-2021-29921
Related
9.8 High
CVSS3
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
7.5 High
CVSS2
Access Vector
NETWORK
Access 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
0.008 Low
EPSS
Percentile
81.4%