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.
The MITRE CVE dictionary describes this issue as:
Find out more about CVE-2013-4238 from the MITRE CVE dictionary dictionary and NIST NVD.
This issue does not affect the version of python as shipped with Red Hat Enterprise Linux 5. The Red Hat Security Response Team has rated this issue as having moderate security impact, a future update may address this flaw.
| Base Score | 4.3 |
|---|---|
| Base Metrics | AV:N/AC:M/Au:N/C:N/I:P/A:N |
| Access Vector | Network |
| Access Complexity | Medium |
| Authentication | None |
| Confidentiality Impact | None |
| Integrity Impact | Partial |
| Availability Impact | None |
Find out more about Red Hat support for the Common Vulnerability Scoring System (CVSS).
| Platform | Errata | Release Date |
|---|---|---|
| Red Hat Enterprise Linux 6 (python) | RHSA-2013:1582 | 2013-11-20 |
| RHEV Hypervisor for RHEL-6 (rhev-hypervisor6) | RHSA-2013:1527 | 2013-11-21 |
| Platform | Package | State |
|---|---|---|
| Red Hat Software Collections 1 for Red Hat Enterprise Linux | python33-python | Will not fix |
| Red Hat Software Collections 1 for Red Hat Enterprise Linux | python | Will not fix |
| Red Hat Enterprise Linux 7 | python | Not affected |
| Red Hat Enterprise Linux 5 | python | Not affected |
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