Red Hat Security Advisory: httpd security and bug fix update

Moderate

It was discovered that the mod_session_crypto module of httpd did not use any mechanisms to verify integrity of the encrypted session data stored in the user's browser. A remote attacker could use this flaw to decrypt and modify session data using a padding oracle attack.

CWE-287 - Improper Authentication

It was discovered that the mod_auth_digest module of httpd did not properly check for memory allocation failures. A remote attacker could use this flaw to cause httpd child processes to repeatedly crash if the server used HTTP digest authentication.

CWE-20 - Improper Input Validation

It was found that Apache was vulnerable to a HTTP response splitting attack for sites which use mod_userdir. An attacker could use this flaw to inject CRLF characters into the HTTP header and could possibly gain access to secure data.

CWE-113 - Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Request/Response Splitting')

It was discovered that the HTTP parser in httpd incorrectly allowed certain characters not permitted by the HTTP protocol specification to appear unencoded in HTTP request headers. If httpd was used in conjunction with a proxy or backend server that interpreted those characters differently, a remote attacker could possibly use this flaw to inject data into HTTP responses, resulting in proxy cache poisoning.

CWE-20 - Improper Input Validation