libsmbclient, samba security update

ID CESA-2017:2789
Type centos
Reporter CentOS Project
Modified 2017-09-21T14:43:52


CentOS Errata and Security Advisory CESA-2017:2789

Samba is an open-source implementation of the Server Message Block (SMB) protocol and the related Common Internet File System (CIFS) protocol, which allow PC-compatible machines to share files, printers, and various information.

Security Fix(es):

  • A race condition was found in samba server. A malicious samba client could use this flaw to access files and directories in areas of the server file system not exported under the share definitions. (CVE-2017-2619)

  • It was found that samba did not enforce "SMB signing" when certain configuration options were enabled. A remote attacker could launch a man-in-the-middle attack and retrieve information in plain-text. (CVE-2017-12150)

  • An information leak flaw was found in the way SMB1 protocol was implemented by Samba. A malicious client could use this flaw to dump server memory contents to a file on the samba share or to a shared printer, though the exact area of server memory cannot be controlled by the attacker. (CVE-2017-12163)

Red Hat would like to thank the Samba project for reporting CVE-2017-2619 and CVE-2017-12150 and Yihan Lian and Zhibin Hu (Qihoo 360 GearTeam), Stefan Metzmacher (SerNet), and Jeremy Allison (Google) for reporting CVE-2017-12163. Upstream acknowledges Jann Horn (Google) as the original reporter of CVE-2017-2619; and Stefan Metzmacher (SerNet) as the original reporter of CVE-2017-12150.

Merged security bulletin from advisories:

Affected packages: libsmbclient libsmbclient-devel samba samba-client samba-common samba-doc samba-domainjoin-gui samba-glusterfs samba-swat samba-winbind samba-winbind-clients samba-winbind-devel samba-winbind-krb5-locator

Upstream details at: