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CVE-2013-4238

UnknownEPSS 5.35%

Last modified

CVE-2013-4238 is a vulnerability of currently unknown severity. The ssl.match_hostname function in the SSL module in Python 2.6 through 3.4 does not properly handle a '\0' character in a domain name in the Subject Alternative Name field of an X.509 certificate, which allows man-in-the-middle attackers to spoof arbitrary SSL servers via a crafted certificate issued by a legitimate Certification Authority, a related issue to CVE-2009-2408.. EPSS estimates a 5.35% chance of exploitation in the next 30 days.

Description

The ssl.match_hostname function in the SSL module in Python 2.6 through 3.4 does not properly handle a '\0' character in a domain name in the Subject Alternative Name field of an X.509 certificate, which allows man-in-the-middle attackers to spoof arbitrary SSL servers via a crafted certificate issued by a legitimate Certification Authority, a related issue to CVE-2009-2408.

Metrics

EPSS Probability
5.35%

91.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersionsUpdate
CanonicalUbuntu Linux10.04—
PythonPython2.6.1—
PythonPython2.6.2—
PythonPython2.6.3—
PythonPython2.6.4—
PythonPython2.6.5—
PythonPython2.6.6—
PythonPython2.6.7—
PythonPython2.6.8—
PythonPython2.6.2150—
PythonPython2.6.6150—
PythonPython2.7.1—
PythonPython2.7.2Rc1
PythonPython2.7.3—
PythonPython2.7.1150—
PythonPython2.7.2150—
PythonPython3.0—
PythonPython3.0.1—
PythonPython3.1—
PythonPython3.1.1—
PythonPython3.1.2—
PythonPython3.1.3—
PythonPython3.1.4—
PythonPython3.1.5—
PythonPython3.1.2150—
PythonPython3.2—
PythonPython3.2.3—
PythonPython3.2.2150—
PythonPython3.3—
PythonPython3.4Alpha1
OpensuseOpensuse11.4—
OpensuseOpensuse12.2—
OpensuseOpensuse12.3—

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is CVE-2013-4238?
The ssl.match_hostname function in the SSL module in Python 2.6 through 3.4 does not properly handle a '\0' character in a domain name in the Subject Alternative Name field of an X.509 certificate, which allows man-in-the-middle attackers to spoof arbitrary SSL servers via a crafted certificate issued by a legitimate Certification Authority, a related issue to CVE-2009-2408.
How severe is CVE-2013-4238?
Severity scoring for CVE-2013-4238 is pending analysis. The EPSS model estimates a 5.35% probability of exploitation in the next 30 days.
How do I fix CVE-2013-4238?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2013-4238?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST