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RHSA-2016:0493: krb5 security update

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RHSA-2016:0493: krb5 security update

Severity
7
CVSS
(AV:N/AC:L/Au:S/C:N/I:N/A:C)
Published
02/12/2016
Created
07/25/2018
Added
03/28/2016
Modified
03/21/2018

Description

Kerberos is a networked authentication system which allows clients andservers to authenticate to each other with the help of a trusted thirdparty, the Kerberos KDC.A memory leak flaw was found in the krb5_unparse_name() function of the MITKerberos kadmind service. An authenticated attacker could repeatedly sendspecially crafted requests to the server, which could cause the server toconsume large amounts of memory resources, ultimately leading to a denialof service due to memory exhaustion. (CVE-2015-8631)An out-of-bounds read flaw was found in the kadmind service of MITKerberos. An authenticated attacker could send a maliciously craftedmessage to force kadmind to read beyond the end of allocated memory, andwrite the memory contents to the KDC database if the attacker has writepermission, 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, whichcontain backported patches to correct these issues. After installing theupdated packages, running Kerberos services (krb5kdc, kadmin, and kprop)will be restarted automatically.

Solution(s)

  • redhat-upgrade-krb5-debuginfo
  • redhat-upgrade-krb5-devel
  • redhat-upgrade-krb5-libs
  • redhat-upgrade-krb5-pkinit-openssl
  • redhat-upgrade-krb5-server
  • redhat-upgrade-krb5-server-ldap
  • redhat-upgrade-krb5-workstation

References

  • redhat-upgrade-krb5-debuginfo
  • redhat-upgrade-krb5-devel
  • redhat-upgrade-krb5-libs
  • redhat-upgrade-krb5-pkinit-openssl
  • redhat-upgrade-krb5-server
  • redhat-upgrade-krb5-server-ldap
  • redhat-upgrade-krb5-workstation

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