CVE-2013-4238

Ubuntu Linux vulnerability

CVSS

4.3

EPSS

5.3%

EPSS pct

92th

Exploited

No known

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.

Affected vendor

Canonical

Affected product

Ubuntu Linux

CVSS vector

AV:N/AC:M/Au:N/C:N/I:P/A:N

Weakness type (CWE)

CWE-20 — Improper Input Validation

Published

2013-08-18

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable over the network, medium attack complexity, requiring no authentication. Successful exploitation leads to partial impact to integrity.

Its EPSS score of 5.3% reflects a lower probability of exploitation activity in the wild over the next 30 days, placing it above 92% of all scored CVEs.

Check your external exposure to CVE-2013-4238

Confirm whether Canonical Ubuntu Linux is running on any internet-facing host or subdomain.
Match discovered service fingerprints against the version affected by CVE-2013-4238.
Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2013-4238

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2013-4238 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

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