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Published: 26 March 2018

In Apache httpd 2.0.23 to 2.0.65, 2.2.0 to 2.2.34, and 2.4.0 to 2.4.29, mod_authnz_ldap, if configured with AuthLDAPCharsetConfig, uses the Accept-Language header value to lookup the right charset encoding when verifying the user's credentials. If the header value is not present in the charset conversion table, a fallback mechanism is used to truncate it to a two characters value to allow a quick retry (for example, 'en-US' is truncated to 'en'). A header value of less than two characters forces an out of bound write of one NUL byte to a memory location that is not part of the string. In the worst case, quite unlikely, the process would crash which could be used as a Denial of Service attack. In the more likely case, this memory is already reserved for future use and the issue has no effect at all.



CVSS 3 base score: 7.5


Package Release Status
Launchpad, Ubuntu, Debian
Released (2.4.30)
Ubuntu 18.04 LTS (Bionic Beaver)
Released (2.4.29-1ubuntu4.1)
Ubuntu 16.04 ESM (Xenial Xerus)
Released (2.4.18-2ubuntu3.8)
Ubuntu 14.04 ESM (Trusty Tahr)
Released (2.4.7-1ubuntu4.20)
Upstream: (2.4)