Test ID:	1.3.6.1.4.1.25623.1.1.10.2017.0420
Category:	Mageia Linux Local Security Checks
Title:	Mageia: Security Advisory (MGASA-2017-0420)
Summary:	The remote host is missing an update for the 'krb5' package(s) announced via the MGASA-2017-0420 advisory.
Description:	Summary: The remote host is missing an update for the 'krb5' package(s) announced via the MGASA-2017-0420 advisory. Vulnerability Insight: An authentication bypass flaw was found in the way krb5's certauth interface handled the validation of client certificates. A remote attacker able to communicate with the KDC could potentially use this flaw to impersonate arbitrary principals under rare and erroneous circumstances (CVE-2017-7562). Note that this issue only affects Mageia 6. RFC 2744 permits a GSS-API implementation to delete an existing security context on a second or subsequent call to gss_init_sec_context() or gss_accept_sec_context() if the call results in an error. This API behavior has been found to be dangerous, leading to the possibility of memory errors in some callers. For safety, GSS-API implementations should instead preserve existing security contexts on error until the caller deletes them (CVE-2017-11462). A buffer overflow vulnerability was found in get_matching_data() function when both the CA cert and the user cert have a long subject affecting krb5 that includes certauth plugin. Attack requires a validated certificate with a long subject and issuer, and a 'pkinit_cert_match' string attribute on some principal in the database. A remote code execution exploit might also require that the attacker gets to choose the contents of the issuer in the validated cert (CVE-2017-15088). Affected Software/OS: 'krb5' package(s) on Mageia 5, Mageia 6. Solution: Please install the updated package(s). CVSS Score: 7.5 CVSS Vector: AV:N/AC:L/Au:N/C:P/I:P/A:P
Cross-Ref:	Common Vulnerability Exposure (CVE) ID: CVE-2017-11462 https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/2FPRUP4YVOEBGEROUYWZFEQ64HTMGNED/ Common Vulnerability Exposure (CVE) ID: CVE-2017-15088 BugTraq ID: 101594 http://www.securityfocus.com/bid/101594 Common Vulnerability Exposure (CVE) ID: CVE-2017-7562 100511 http://www.securityfocus.com/bid/100511 RHSA-2018:0666 https://access.redhat.com/errata/RHSA-2018:0666 https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2017-7562 https://github.com/krb5/krb5/pull/694 https://github.com/krb5/krb5/pull/694/commits/1de6ca2f2eb1fdbab51f1549a25a6903aefcc196 https://github.com/krb5/krb5/pull/694/commits/50fe4074f188c2d4da0c421e96553acea8378db2 https://github.com/krb5/krb5/pull/694/commits/b7af544e50a4d8291524f590e20dd44430bf627d
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