The checkPassword function in python-kerberos does not authenticate the KDC it attempts to communicate with, which allows remote attackers to cause a denial of service (bad response), or have other un
The checkPassword function in python-kerberos does not authenticate the KDC it attempts to communicate with, which allows remote attackers to cause a denial of service (bad response), or have other unspecified impact by performing a man-in-the-middle attack.
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Python (PyPI) | kerberos | <= 1.2.5 | no fix |
| Python (PyPI) | pykerberos | < 1.1.6 | 1.1.6 |
References
- https://pypi.python.org/pypi/kerberos
- https://github.com/apple/ccs-pykerberos/issues/31
- https://bugzilla.redhat.com/show_bug.cgi?id=1223802
- http://www.securityfocus.com/bid/74760
- http://www.openwall.com/lists/oss-security/2015/05/21/3
- https://nvd.nist.gov/vuln/detail/CVE-2015-3206
- https://github.com/apple/ccs-pykerberos/commit/9cb61c93f9b24dd18a0a315f3df5445529c5c333
- https://github.com/apple/ccs-pykerberos
- https://github.com/pypa/advisory-database/tree/main/vulns/kerberos/PYSEC-2017-49.yaml
- https://github.com/pypa/advisory-database/tree/main/vulns/pykerberos/PYSEC-2017-66.yaml
- https://web.archive.org/web/20150910143429/https://trac.calendarserver.org/ticket/833
- https://web.archive.org/web/20200228090829/http://www.securityfocus.com/bid/74760
- https://github.com/advisories/GHSA-mffc-9gx5-99g3
- CVSS vector
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H- Weakness (CWE)
CWE-287- Platform
- Python (PyPI)
- Package
kerberos, pykerberos- Disclosed
- 25.08.2017
- Updated
- 11.10.2026 12:20
Sources and licenses
OSV / GitHub Advisory Database - PYSEC-2017-49 - PyPA Advisory Database; CC BY 4.0
OSV / GitHub Advisory Database - GHSA-mffc-9gx5-99g3 - CC BY 4.0
OSV / GitHub Advisory Database - PYSEC-2017-66 - PyPA Advisory Database; CC BY 4.0
Vulnerability history: kerberos
All published vulnerabilities of this package (Python (PyPI)), newest first. Shows whether this is a one-off slip or a package that needs watching.
This is the only known vulnerability of this package.
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