CVE-2015-2696

Updated krb5 packages fix security vulnerabilities:

In MIT krb5 1.5 and later, applications which call gss_inquire_context() on a partially-established SPNEGO context can cause the GSS-API library to read from a pointer using the wrong type, generally causing a process crash. This bug may go unnoticed, because the most common SPNEGO authentication scenario establishes the context after just one call to gss_accept_sec_context(). Java server applications using the native JGSS provider are vulnerable to this bug. A carefully crafted SPNEGO packet might allow the gss_inquire_context() call to succeed with attacker-determined results, but applications should not make access control decisions based on gss_inquire_context() results prior to context establishment (CVE-2015-2695).

In MIT krb5 1.9 and later, applications which call gss_inquire_context() on a partially-established IAKERB context can cause the GSS-API library to read from a pointer using the wrong type, generally causing a process crash. Java server applications using the native JGSS provider are vulnerable to this bug. A carefully crafted IAKERB packet might allow the gss_inquire_context() call to succeed with attacker-determined results, but applications should not make access control decisions based on gss_inquire_context() results prior to context establishment (CVE-2015-2696).

In MIT krb5 1.7 and later, an authenticated attacker may be able to cause a KDC to crash using a TGS request with a large realm field beginning with a null byte. If the KDC attempts to find a referral to answer the request, it constructs a principal name for lookup using krb5_build_principal() with the requested realm. Due to a bug in this function, the null byte causes only one byte be allocated for the realm field of the constructed principal, far less than its length. Subsequent operations on the lookup principal may cause a read beyond the end of the mapped memory region, causing the KDC process to crash (CVE-2015-2697).

These are all security issues fixed in the krb5-1.15-1.1 package on the GA media of openSUSE Tumbleweed.

krb5 was updated to fix three security issues.

These security issues were fixed:

• CVE-2015-2695: Applications which call gss_inquire_context() on a partially-established SPNEGO context could have caused the GSS-API library to read from a pointer using the wrong type, generally causing a process crash. (bsc#952188).
• CVE-2015-2696: Applications which call gss_inquire_context() on a partially-established IAKERB context could have caused the GSS-API library to read from a pointer using the wrong type, generally causing a process crash. (bsc#952189).
• CVE-2015-2697: Incorrect string handling in build_principal_va can lead to DOS (bsc#952190).

lib/gssapi/krb5/iakerb.c in MIT Kerberos 5 (aka krb5) before 1.14 relies on an inappropriate context handle, which allows remote attackers to cause a denial of service (incorrect pointer read and process crash) via a crafted IAKERB packet that is mishandled during a gss_inquire_context call.

It was discovered that the Kerberos kpasswd service incorrectly handled certain UDP packets. A remote attacker could possibly use this issue to cause resource consumption, resulting in a denial of service. This issue only affected Ubuntu 12.04 LTS. (CVE-2002-2443)

It was discovered that Kerberos incorrectly handled null bytes in certain data fields. A remote attacker could possibly use this issue to cause a denial of service. This issue only affected Ubuntu 12.04 LTS and Ubuntu 14.04 LTS. (CVE-2014-5355)

It was discovered that the Kerberos kdcpreauth modules incorrectly tracked certain client requests. A remote attacker could possibly use this issue to bypass intended preauthentication requirements. This issue only affected Ubuntu 14.04 LTS and Ubuntu 15.04. (CVE-2015-2694)

It was discovered that Kerberos incorrectly handled certain SPNEGO packets. A remote attacker could possibly use this issue to cause a denial of service. (CVE-2015-2695)

It was discovered that Kerberos incorrectly handled certain IAKERB packets. A remote attacker could possibly use this issue to cause a denial of service. (CVE-2015-2696, CVE-2015-2698)

It was discovered that Kerberos incorrectly handled certain TGS requests. A remote attacker could possibly use this issue to cause a denial of service. (CVE-2015-2697)