RHSA-2010:0221: Low: squid security and bug fix update

Squid is a high-performance proxy caching server for web clients,supporting FTP, Gopher, and HTTP data objects.A flaw was found in the way Squid processed certain external ACL helperHTTP header fields that contained a delimiter that was not a comma. Aremote attacker could issue a crafted request to the Squid server, causingexcessive CPU use (up to 100%). (CVE-2009-2855)Note: The CVE-2009-2855 issue only affected non-default configurations thatuse an external ACL helper script.A flaw was found in the way Squid handled truncated DNS replies. A remoteattacker able to send specially-crafted UDP packets to Squid's DNS clientport could trigger an assertion failure in Squid's child process, causingthat child process to exit. (CVE-2010-0308)This update also fixes the following bugs: Squid's init script returns a non-zero value when trying to stop a stopped service. This is not LSB compliant and can generate difficulties incluster environments. This update makes stopping LSB compliant. (BZ#521926) Squid is not currently built to support MAC address filtering in ACLs. This update includes support for MAC address filtering. (BZ#496170) Squid is not currently built to support Kerberos negotiate authentication. This update enables Kerberos authentication. (BZ#516245) Squid does not include the port number as part of URIs it constructs when configured as an accelerator. This results in a 403 error. This updatecorrects this behavior. (BZ#538738) the errormap feature does not work if the same handling is set also on the HTTP server that operates in deflate mode. This update fixes thisissue. (BZ#470843)All users of squid should upgrade to this updated package, which resolvesthese issues. After installing this update, the squid service will berestarted automatically.