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Security Advisories: GSA_kwCzR0hTQS1tY2c2LWgzNjItY21xNc0yIQ
Improper Authorization in cobbler
Impact
If PAM is correctly configured and a user account is set to expired, the expired user-account is still able to successfully log into Cobbler in all places (Web UI, CLI & XMLRPC-API).
The same applies to user accounts with passwords set to be expired.
Patches
There is a patch for the latest Cobbler 3.3.2
available, however a backport will be done for 3.2.x
.
Workarounds
- Delete expired accounts which are able to access Cobbler via PAM.
- Use
chage -l <username>
to lock the account. If the account has SSH-Keys attached then remove them completely.
References
- Originally discovered by @ysf at https://www.huntr.dev/bounties/c458b868-63df-414e-af10-47e3745caa1d/
How to test if my Cobbler instance is affected?
The following pytest
test assumes that your PAM setup is correct. In case the added user is not able to login, this test does not make sense to be executed.
def test_pam_login_with_expired_user():
# Arrange
# create pam testuser
test_username = "expired_user"
test_password = "password"
test_api = CobblerAPI()
subprocess_1 = subprocess.run(
["perl", "-e", "'print crypt(\"%s\", \"%s\")'" % (test_username, test_password)],
stdout=subprocess.PIPE
)
subprocess.run(["useradd", "-p", subprocess_1.stdout, test_username])
# change user to be expired
subprocess.run(["chage", "-E0", test_username])
# Act
result = pam.authenticate(test_api, test_username, test_password)
# Assert - login should fail
assert not result
For more information
If you have any questions or comments about this advisory:
- Open an issue in the Cobbler repository
- Ask in the Gitter/Matrix Chat
- Email us at [email protected]
JSON: https://advisories.ecosyste.ms/api/v1/advisories/GSA_kwCzR0hTQS1tY2c2LWgzNjItY21xNc0yIQ
Source: GitHub Advisory Database
Origin: Unspecified
Severity: High
Classification: General
Published: about 2 years ago
Updated: over 1 year ago
CVSS Score: 8.2
CVSS vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
Identifiers: GHSA-mcg6-h362-cmq5, CVE-2022-0860
References:
- https://github.com/cobbler/cobbler/security/advisories/GHSA-mcg6-h362-cmq5
- https://nvd.nist.gov/vuln/detail/CVE-2022-0860
- https://github.com/cobbler/cobbler/commit/9044aa990a94752fa5bd5a24051adde099280bfa
- https://huntr.dev/bounties/c458b868-63df-414e-af10-47e3745caa1d
- https://lists.fedoraproject.org/archives/list/[email protected]/message/DYWYHWVVRUSPCV5SWBOSAMQJQLTSBTKY/
- https://lists.fedoraproject.org/archives/list/[email protected]/message/D4KCNZYBQC2FM5SEEDRQZO4LRZ4ZECMG/
- https://lists.fedoraproject.org/archives/list/[email protected]/message/IYSHMF6MEIITFAG7EJ3IQKVUN7MDV2XM/
- https://github.com/advisories/GHSA-mcg6-h362-cmq5
- https://github.com/pypa/advisory-database/tree/main/vulns/cobbler/PYSEC-2022-177.yaml
Blast Radius: 8.5
Affected Packages
pypi:cobbler
Dependent packages: 0Dependent repositories: 11
Downloads: 292 last month
Affected Version Ranges: < 3.3.2
Fixed in: 3.3.2
All affected versions: 3.1.2, 3.2.1, 3.2.2, 3.3.0, 3.3.1
All unaffected versions: 3.3.2, 3.3.3, 3.3.4