SUSE-SU-2017:2327-2: important: Security update for xen

\n\n SUSE Security Update: Security update for xen

Announcement ID: SUSE-SU-2017:2327-2
Rating: important
References: #1002573 #1026236 #1027519 #1035231 #1046637
#1049578 #1051787 #1051788 #1051789 #1052686
Cross-References: CVE-2017-10664 CVE-2017-11434 CVE-2017-12135
CVE-2017-12136 CVE-2017-12137 CVE-2017-12855

Affected Products:
SUSE Linux Enterprise Server 12-SP3

An update that solves 6 vulnerabilities and has 5 fixes is
now available.


This update for xen fixes several issues.

These security issues were fixed:

– CVE-2017-12135: Unbounded recursion in grant table code allowed a
malicious guest to crash the host or potentially escalate
privileges/leak information (XSA-226, bsc#1051787).
– CVE-2017-12137: Incorrectly-aligned updates to pagetables allowed for
privilege escalation (XSA-227, bsc#1051788).
– CVE-2017-12136: Race conditions with maptrack free list handling allows
a malicious guest administrator to crash the host or escalate their
privilege to that of the host (XSA-228, bsc#1051789).
– CVE-2017-11434: The dhcp_decode function in slirp/bootp.c allowed local
guest OS users to cause a denial of service (out-of-bounds read) via a
crafted DHCP
options string (bsc#1049578).
– CVE-2017-10664: qemu-nbd did not ignore SIGPIPE, which allowed remote
attackers to cause a denial of service (daemon crash) by disconnecting
during a server-to-client reply attempt (bsc#1046637).
– CVE-2017-12855: Premature clearing of GTF_writing / GTF_reading lead to
potentially leaking sensitive information (XSA-230 bsc#1052686.

These non-security issues were fixed:

– bsc#1055695: XEN: 11SP4 and 12SP3 HVM guests can not be restored after
the save using xl stack
– bsc#1035231: Migration of HVM domU did not use superpages on destination
– bsc#1002573: Optimized LVM functions in block-dmmd block-dmmd

Patch Instructions:

To install this SUSE Security Update use YaST online_update.
Alternatively you can run the command listed for your product:

– SUSE Linux Enterprise Server 12-SP3:

zypper in -t patch SUSE-SLE-SERVER-12-SP3-2017-1437=1

To bring your system up-to-date, use “zypper patch”.

Package List:

– SUSE Linux Enterprise Server 12-SP3 (x86_64):



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