CVE-2017-11427 Multiple SAML libraries may allow authentication bypass via incorrect XML canonicalization and DOM traversal
Attackers can bypass SAML authentication by manipulating XML data without invalidating signatures, affecting applications using OneLogin PythonSAML.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2017-11427?
CVE-2017-11427 is a high-severity authentication bypass vulnerability in OneLogin PythonSAML, published on 17 Apr 2019. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
OneLogin PythonSAML 2.3.0 and earlier may incorrectly utilize the results of XML DOM traversal and canonicalization APIs in such a way that an attacker may be able to manipulate the SAML data without invalidating the cryptographic signature, allowing the attack to potentially bypass authentication to SAML service providers.
Weakness: CWE-287
Which versions are affected by CVE-2017-11427?
3 open source packages ship an affected version, including python-saml. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
python-saml PyPI | All versions | 2.4.0 |
python-saml PyPI | All versions | 2.4.0 |
python-saml PyPI | All versions | 2.4.0 |
Linux distribution packages (8)
python-defusedxml SUSE:Enterprise Storage 6 | All versions | 0.6.0-1.5.1 |
python-freezegun SUSE:Enterprise Storage 6 | All versions | 0.3.12-1.5.1 |
python-isodate SUSE:Enterprise Storage 6 | All versions | 0.6.0-1.3.2 |
python-pkgconfig SUSE:Enterprise Storage 6 | All versions | 1.5.1-1.5.1 |
python-python3-saml SUSE:Enterprise Storage 6 | All versions | 1.9.0-1.5.2 |
python-xmlsec SUSE:Enterprise Storage 6 | All versions | 1.3.6-1.5.1 |
python-python3-saml openSUSE:Tumbleweed | All versions | 1.15.0-2.3 |
python-python3-saml openSUSE:Tumbleweed | All versions | 1.16.0-2.4 |
Products include Onelogin Pythonsaml.
How do I fix CVE-2017-11427?
Upgrade python-saml to 2.4.0 or later.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2017-11427 being exploited?
There is no known exploitation of CVE-2017-11427 in the wild and no public exploit code.
Public exploit code: 1 proofs of concept on GitHub.
Sources
Also known as GHSA-j8j8-348v-wfm3, PYSEC-2019-198, SUSE-SU-2021:0048-1, openSUSE-SU-2024:11262-1, openSUSE-SU-2024:14159-1, openSUSE-SU-2026:12034-1.