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RHSA-2014:0867: samba security update

Severity CVSS Published Added Modified
4 (AV:N/AC:M/Au:S/C:P/I:N/A:N) May 28, 2014 July 29, 2014 July 04, 2017


Samba is an open-source implementation of the Server Message Block (SMB) orCommon Internet File System (CIFS) protocol, which allows PC-compatiblemachines to share files, printers, and other information.A denial of service flaw was found in the way the sys_recvfile() functionof nmbd, the NetBIOS message block daemon, processed non-blocking sockets.An attacker could send a specially crafted packet that, when processed,would cause nmbd to enter an infinite loop and consume an excessive amountof CPU time. (CVE-2014-0244)A flaw was found in the way Samba created responses for certainauthenticated client requests when a shadow-copy VFS module was enabled.An attacker able to send an authenticated request could use this flaw todisclose limited portions of memory per each request. (CVE-2014-0178)It was discovered that smbd, the Samba file server daemon, did not properlyhandle certain files that were stored on the disk and used a valid Unicodecharacter in the file name. An attacker able to send an authenticatednon-Unicode request that attempted to read such a file could cause smbd tocrash. (CVE-2014-3493)Red Hat would like to thank Daniel Berteaud of FIREWALL-SERVICES SARL forreporting CVE-2014-0244, and the Samba project for reporting CVE-2014-0178and CVE-2014-3493. The Samba project acknowledges Christof Schmitt as theoriginal reporter of CVE-2014-0178, and Simon Arlott as the originalreporter of CVE-2014-3493.All Samba users are advised to upgrade to these updated packages, whichcontain backported patches to correct these issues. After installing thisupdate, the smb service will be restarted automatically.

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