RHSA-2017:2338 - Security Advisory

Topic

An update for samba is now available for Red Hat Gluster Storage 3.2 for Red Hat Enterprise Linux 7.

Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

Description

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)
• A flaw was found in the way Samba handled dangling symlinks. An authenticated malicious Samba client could use this flaw to cause the smbd daemon to enter an infinite loop and use an excessive amount of CPU and memory. (CVE-2017-9461)

Red Hat would like to thank the Samba project for reporting CVE-2017-2619. Upstream acknowledges Jann Horn (Google) as the original reporter of CVE-2017-2619.

Solution

For details on how to apply this update, which includes the changes described in this advisory, refer to:

https://access.redhat.com/articles/11258

After installing this update, the smb service will be restarted automatically.

Affected Products

• Red Hat Gluster Storage Server for On-premise 3 for RHEL 7 x86_64

Fixes

• BZ - 1429472 - CVE-2017-2619 samba: symlink race permits opening files outside share directory
• BZ - 1459464 - CVE-2017-9461 samba: fd_open_atomic infinite loop due to wrong handling of dangling symlinks
• BZ - 1465528 - RHEL7.4 Upgrade fails over RHGS 3.2.0 for samba ctdb packages

CVEs

• CVE-2017-2619
• CVE-2017-9461

References

• https://access.redhat.com/security/updates/classification/#moderate