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=========================================================== Ubuntu Security Notice USN-544-2 November 16, 2007 samba regression CVE-2007-4572, https://launchpad.net/bugs/163042 =========================================================== A security issue affects the following Ubuntu releases: Ubuntu 6.06 LTS Ubuntu 6.10 Ubuntu 7.04 Ubuntu 7.10 This advisory also applies to the corresponding versions of Kubuntu, Edubuntu, and Xubuntu. The problem can be corrected by upgrading your system to the following package versions: Ubuntu 6.06 LTS: samba 3.0.22-1ubuntu3.5 Ubuntu 6.10: samba 3.0.22-1ubuntu4.4 Ubuntu 7.04: samba 3.0.24-2ubuntu1.4 Ubuntu 7.10: samba 3.0.26a-1ubuntu2.2 In general, a standard system upgrade is sufficient to effect the necessary changes. Details follow: USN-544-1 fixed two vulnerabilities in Samba. Fixes for CVE-2007-5398 are unchanged, but the upstream changes for CVE-2007-4572 introduced a regression in all releases which caused Linux smbfs mounts to fail. Additionally, Dapper and Edgy included an incomplete patch which caused configurations using NetBIOS to fail. A proper fix for these regressions does not exist at this time, and so the patch addressing CVE-2007-4572 has been removed. This vulnerability is believed to be an unexploitable denial of service, but a future update will address this issue. We apologize for the inconvenience. Original advisory details: Samba developers discovered that nmbd could be made to overrun a buffer during the processing of GETDC logon server requests. When samba is configured as a Primary or Backup Domain Controller, a remote attacker could send malicious logon requests and possibly cause a denial of service. (CVE-2007-4572) Alin Rad Pop of Secunia Research discovered that nmbd did not properly check the length of netbios packets. When samba is configured as a WINS server, a remote attacker could send multiple crafted requests resulting in the execution of arbitrary code with root privileges. (CVE-2007-5398)