| Package | Affected versions | Patched versions |
|---|---|---|
| org.apache.httpcomponents:httpclient | < 4.3.5 | 4.3.5 |
| httpasyncclient | ≥ 4.0, ≤ 4.0.1 | |
| httpclient | ≥ 4.0, ≤ 4.3.4 |
org.apache.http.conn.ssl.AbstractVerifier in Apache HttpComponents HttpClient before 4.3.5 and HttpAsyncClient before 4.0.2 does not properly verify that the server hostname matches a domain name in the subject's Common Name (CN) or subjectAltName field of the X.509 certificate, which allows man-in-the-middle attackers to spoof SSL servers via a "CN=" string in a field in the distinguished name (DN) of a certificate, as demonstrated by the "foo,CN=www.apache.org" string in the O field.
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