RedHat: RHSA-2016-0493:01 Moderate: krb5 security update
Summary
Kerberos is a networked authentication system which allows clients and
servers to authenticate to each other with the help of a trusted third
party, the Kerberos KDC.
A memory leak flaw was found in the krb5_unparse_name() function of the MIT
Kerberos kadmind service. An authenticated attacker could repeatedly send
specially crafted requests to the server, which could cause the server to
consume large amounts of memory resources, ultimately leading to a denial
of service due to memory exhaustion. (CVE-2015-8631)
An out-of-bounds read flaw was found in the kadmind service of MIT
Kerberos. An authenticated attacker could send a maliciously crafted
message to force kadmind to read beyond the end of allocated memory, and
write the memory contents to the KDC database if the attacker has write
permission, leading to information disclosure. (CVE-2015-8629)
The CVE-2015-8631 issue was discovered by Simo Sorce of Red Hat.
All krb5 users are advised to upgrade to these updated packages, which
contain backported patches to correct these issues. After installing the
updated packages, running Kerberos services (krb5kdc, kadmin, and kprop)
will be restarted automatically.
Summary
Solution
Before applying this update, make sure all previously released errata
relevant to your system have been applied.
For details on how to apply this update, refer to:
https://access.redhat.com/articles/11258
References
https://access.redhat.com/security/cve/CVE-2015-8629 https://access.redhat.com/security/cve/CVE-2015-8631 https://access.redhat.com/security/updates/classification/#moderate
Package List
Red Hat Enterprise Linux Desktop (v. 6):
Source:
krb5-1.10.3-42z1.el6_7.src.rpm
i386:
krb5-debuginfo-1.10.3-42z1.el6_7.i686.rpm
krb5-libs-1.10.3-42z1.el6_7.i686.rpm
krb5-pkinit-openssl-1.10.3-42z1.el6_7.i686.rpm
krb5-workstation-1.10.3-42z1.el6_7.i686.rpm
x86_64:
krb5-debuginfo-1.10.3-42z1.el6_7.i686.rpm
krb5-debuginfo-1.10.3-42z1.el6_7.x86_64.rpm
krb5-libs-1.10.3-42z1.el6_7.i686.rpm
krb5-libs-1.10.3-42z1.el6_7.x86_64.rpm
krb5-pkinit-openssl-1.10.3-42z1.el6_7.x86_64.rpm
krb5-workstation-1.10.3-42z1.el6_7.x86_64.rpm
Red Hat Enterprise Linux Desktop Optional (v. 6):
i386:
krb5-debuginfo-1.10.3-42z1.el6_7.i686.rpm
krb5-devel-1.10.3-42z1.el6_7.i686.rpm
krb5-server-1.10.3-42z1.el6_7.i686.rpm
krb5-server-ldap-1.10.3-42z1.el6_7.i686.rpm
x86_64:
krb5-debuginfo-1.10.3-42z1.el6_7.i686.rpm
krb5-debuginfo-1.10.3-42z1.el6_7.x86_64.rpm
krb5-devel-1.10.3-42z1.el6_7.i686.rpm
krb5-devel-1.10.3-42z1.el6_7.x86_64.rpm
krb5-server-1.10.3-42z1.el6_7.x86_64.rpm
krb5-server-ldap-1.10.3-42z1.el6_7.i686.rpm
krb5-server-ldap-1.10.3-42z1.el6_7.x86_64.rpm
Red Hat Enterprise Linux HPC Node (v. 6):
Source:
krb5-1.10.3-42z1.el6_7.src.rpm
x86_64:
krb5-debuginfo-1.10.3-42z1.el6_7.i686.rpm
krb5-debuginfo-1.10.3-42z1.el6_7.x86_64.rpm
krb5-libs-1.10.3-42z1.el6_7.i686.rpm
krb5-libs-1.10.3-42z1.el6_7.x86_64.rpm
krb5-pkinit-openssl-1.10.3-42z1.el6_7.x86_64.rpm
krb5-workstation-1.10.3-42z1.el6_7.x86_64.rpm
Red Hat Enterprise Linux HPC Node Optional (v. 6):
x86_64:
krb5-debuginfo-1.10.3-42z1.el6_7.i686.rpm
krb5-debuginfo-1.10.3-42z1.el6_7.x86_64.rpm
krb5-devel-1.10.3-42z1.el6_7.i686.rpm
krb5-devel-1.10.3-42z1.el6_7.x86_64.rpm
krb5-server-1.10.3-42z1.el6_7.x86_64.rpm
krb5-server-ldap-1.10.3-42z1.el6_7.i686.rpm
krb5-server-ldap-1.10.3-42z1.el6_7.x86_64.rpm
Red Hat Enterprise Linux Server (v. 6):
Source:
krb5-1.10.3-42z1.el6_7.src.rpm
i386:
krb5-debuginfo-1.10.3-42z1.el6_7.i686.rpm
krb5-devel-1.10.3-42z1.el6_7.i686.rpm
krb5-libs-1.10.3-42z1.el6_7.i686.rpm
krb5-pkinit-openssl-1.10.3-42z1.el6_7.i686.rpm
krb5-server-1.10.3-42z1.el6_7.i686.rpm
krb5-server-ldap-1.10.3-42z1.el6_7.i686.rpm
krb5-workstation-1.10.3-42z1.el6_7.i686.rpm
ppc64:
krb5-debuginfo-1.10.3-42z1.el6_7.ppc.rpm
krb5-debuginfo-1.10.3-42z1.el6_7.ppc64.rpm
krb5-devel-1.10.3-42z1.el6_7.ppc.rpm
krb5-devel-1.10.3-42z1.el6_7.ppc64.rpm
krb5-libs-1.10.3-42z1.el6_7.ppc.rpm
krb5-libs-1.10.3-42z1.el6_7.ppc64.rpm
krb5-pkinit-openssl-1.10.3-42z1.el6_7.ppc64.rpm
krb5-server-1.10.3-42z1.el6_7.ppc64.rpm
krb5-server-ldap-1.10.3-42z1.el6_7.ppc.rpm
krb5-server-ldap-1.10.3-42z1.el6_7.ppc64.rpm
krb5-workstation-1.10.3-42z1.el6_7.ppc64.rpm
s390x:
krb5-debuginfo-1.10.3-42z1.el6_7.s390.rpm
krb5-debuginfo-1.10.3-42z1.el6_7.s390x.rpm
krb5-devel-1.10.3-42z1.el6_7.s390.rpm
krb5-devel-1.10.3-42z1.el6_7.s390x.rpm
krb5-libs-1.10.3-42z1.el6_7.s390.rpm
krb5-libs-1.10.3-42z1.el6_7.s390x.rpm
krb5-pkinit-openssl-1.10.3-42z1.el6_7.s390x.rpm
krb5-server-1.10.3-42z1.el6_7.s390x.rpm
krb5-server-ldap-1.10.3-42z1.el6_7.s390.rpm
krb5-server-ldap-1.10.3-42z1.el6_7.s390x.rpm
krb5-workstation-1.10.3-42z1.el6_7.s390x.rpm
x86_64:
krb5-debuginfo-1.10.3-42z1.el6_7.i686.rpm
krb5-debuginfo-1.10.3-42z1.el6_7.x86_64.rpm
krb5-devel-1.10.3-42z1.el6_7.i686.rpm
krb5-devel-1.10.3-42z1.el6_7.x86_64.rpm
krb5-libs-1.10.3-42z1.el6_7.i686.rpm
krb5-libs-1.10.3-42z1.el6_7.x86_64.rpm
krb5-pkinit-openssl-1.10.3-42z1.el6_7.x86_64.rpm
krb5-server-1.10.3-42z1.el6_7.x86_64.rpm
krb5-server-ldap-1.10.3-42z1.el6_7.i686.rpm
krb5-server-ldap-1.10.3-42z1.el6_7.x86_64.rpm
krb5-workstation-1.10.3-42z1.el6_7.x86_64.rpm
Red Hat Enterprise Linux Workstation (v. 6):
Source:
krb5-1.10.3-42z1.el6_7.src.rpm
i386:
krb5-debuginfo-1.10.3-42z1.el6_7.i686.rpm
krb5-devel-1.10.3-42z1.el6_7.i686.rpm
krb5-libs-1.10.3-42z1.el6_7.i686.rpm
krb5-pkinit-openssl-1.10.3-42z1.el6_7.i686.rpm
krb5-server-1.10.3-42z1.el6_7.i686.rpm
krb5-server-ldap-1.10.3-42z1.el6_7.i686.rpm
krb5-workstation-1.10.3-42z1.el6_7.i686.rpm
x86_64:
krb5-debuginfo-1.10.3-42z1.el6_7.i686.rpm
krb5-debuginfo-1.10.3-42z1.el6_7.x86_64.rpm
krb5-devel-1.10.3-42z1.el6_7.i686.rpm
krb5-devel-1.10.3-42z1.el6_7.x86_64.rpm
krb5-libs-1.10.3-42z1.el6_7.i686.rpm
krb5-libs-1.10.3-42z1.el6_7.x86_64.rpm
krb5-pkinit-openssl-1.10.3-42z1.el6_7.x86_64.rpm
krb5-server-1.10.3-42z1.el6_7.x86_64.rpm
krb5-server-ldap-1.10.3-42z1.el6_7.i686.rpm
krb5-server-ldap-1.10.3-42z1.el6_7.x86_64.rpm
krb5-workstation-1.10.3-42z1.el6_7.x86_64.rpm
These packages are GPG signed by Red Hat for security. Our key and
details on how to verify the signature are available from
https://access.redhat.com/security/team/key/
Topic
Updated krb5 packages that fix two security issues are now availablefor Red Hat Enterprise Linux 6.Red Hat Product Security has rated this update as having Moderate securityimpact. Common Vulnerability Scoring System (CVSS) base scores, which givedetailed severity ratings, are available for each vulnerability from theCVE links in the References section.
Topic
Relevant Releases Architectures
Red Hat Enterprise Linux Desktop (v. 6) - i386, x86_64
Red Hat Enterprise Linux Desktop Optional (v. 6) - i386, x86_64
Red Hat Enterprise Linux HPC Node (v. 6) - x86_64
Red Hat Enterprise Linux HPC Node Optional (v. 6) - x86_64
Red Hat Enterprise Linux Server (v. 6) - i386, ppc64, s390x, x86_64
Red Hat Enterprise Linux Workstation (v. 6) - i386, x86_64
Bugs Fixed
1302617 - CVE-2015-8629 krb5: xdr_nullstring() doesn't check for terminating null character
1302642 - CVE-2015-8631 krb5: Memory leak caused by supplying a null principal name in request