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Red Hat Enterprise Linux 6: RHSA-2016:0493-01 Moderate: krb5 Memory Leak

red hat
Calendar Grey March 22, 2016
Dist Redhat Esm H88
Timely krb5 patch by Red Hat tackling memory leak and buffer overflow vulnerabilities. Secure your environment today!
Updated krb5 packages that fix two security issues are now available for Red Hat Enterprise Linux 6

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

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.

Topics%20covered

Topics Covered

security advisory Red Hat update memory leak information disclosure service denial krb5

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

Read the Full Advisory


Advisory ID: RHSA-2016:0493-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2016:0493.html
Issue date: 2016-03-22

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.

Topics%20covered

Topics Covered

security advisory Red Hat update memory leak information disclosure service denial krb5

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

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