RHSA-2018:3056 - Security Advisory

Topic

An update for samba is now available 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.

The following packages have been upgraded to a later upstream version: samba (4.8.3). (BZ#1558560)

Security Fix(es):

• samba: Weak authentication protocol regression (CVE-2018-1139)
• samba: Insufficient input validation in libsmbclient (CVE-2018-10858)
• samba: NULL pointer dereference in printer server process (CVE-2018-1050)

For more details about the security issue(s), including the impact, a CVSS score, and other related information, refer to the CVE page(s) listed in the References section.

Red Hat would like to thank the Samba project for reporting CVE-2018-1050. The CVE-2018-1139 issue was discovered by Vivek Das (Red Hat).

Additional Changes:

For detailed information on changes in this release, see the Red Hat Enterprise Linux 7.6 Release Notes linked from the References section.

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 Enterprise Linux Server 7 x86_64
• Red Hat Enterprise Linux Workstation 7 x86_64
• Red Hat Enterprise Linux Desktop 7 x86_64
• Red Hat Enterprise Linux for IBM z Systems 7 s390x
• Red Hat Enterprise Linux for Power, big endian 7 ppc64
• Red Hat Enterprise Linux for Scientific Computing 7 x86_64
• Red Hat Enterprise Linux Resilient Storage for x86_64 7 x86_64
• Red Hat Enterprise Linux for Power, little endian 7 ppc64le
• Red Hat Enterprise Linux Resilient Storage for IBM z Systems 7 s390x
• Red Hat Enterprise Linux Resilient Storage for Power, little endian 7 ppc64le
• Red Hat Enterprise Linux for ARM 64 7 aarch64
• Red Hat Enterprise Linux for Power 9 7 ppc64le
• Red Hat Enterprise Linux for IBM System z (Structure A) 7 s390x

Fixes

• BZ - 1525511 - Fix idmap_rid dependency on trusted domain list
• BZ - 1532618 - Kept getting "smbd[process-id]: PANIC (pid <process-id>): internal error"
• BZ - 1538771 - CVE-2018-1050 samba: NULL pointer dereference in printer server process
• BZ - 1540457 - User login issue from one-way trusted domains has not been fixed
• BZ - 1558560 - Rebase samba in RHEL-7.6 to Samba 4.8.3
• BZ - 1558943 - winbind use 100%cpu and disfunctional
• BZ - 1570020 - coredump with dfsgetinfo
• BZ - 1575205 - net ads join crashing during DoDNSUpdate
• BZ - 1581016 - smbclient echos 'Try "help" to get a list of possible commands.' to tty
• BZ - 1582541 - Windows 10 can only authenticate against smbd's local SAM with NTLMv1
• BZ - 1589651 - CVE-2018-1139 samba: Weak authentication protocol regression
• BZ - 1612805 - CVE-2018-10858 samba: Insufficient input validation in libsmbclient
• BZ - 1614132 - smbd crashes with "assert failed: dirp->fsp->dptr->dir_hnd == dirp"

CVEs

• CVE-2018-1050
• CVE-2018-1139
• CVE-2018-10858

References

• https://access.redhat.com/security/updates/classification/#moderate
• https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/html/7.6_release_notes/index