The remote Oracle Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2018-0666 advisory.

    - Fix CVE-2017-7562 (certauth eku bypass)
    - Fix CVE-2017-11368 (s4u2 request assertion failures)

Tenable has extracted the preceding description block directly from the Oracle Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

According to the versions of the krb5 packages installed, the EulerOS Virtualization for ARM 64 installation on the remote host is affected by the following vulnerabilities :

  - Kerberos is a network authentication system. The     krb5-server package contains the programs that must be     installed on a Kerberos 5 key distribution center     (KDC). If you are installing a Kerberos 5 KDC, you need     to install this package (in other words, most people     should NOT install this package). Security Fix(es):MIT     Kerberos 5 (aka krb5) before 1.17.2 and 1.18.x before     1.18.3 allows unbounded recursion via an ASN.1-encoded     Kerberos message because the     lib/krb5/asn.1/asn1_encode.c support for BER indefinite     lengths lacks a recursion limit.(CVE-2020-28196)In MIT     Kerberos 5 (aka krb5) 1.7 and later, an authenticated     attacker can cause a KDC assertion failure by sending     invalid S4U2Self or S4U2Proxy requests.(CVE-2017-11368)

Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

The remote Redhat Enterprise Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2018:0666 advisory.

    Kerberos is a network authentication system, which can improve the security of your network by eliminating     the insecure practice of sending passwords over the network in unencrypted form. It allows clients and     servers to authenticate to each other with the help of a trusted third party, the Kerberos key     distribution center (KDC).

    Security Fix(es):

    * krb5: Authentication bypass by improper validation of certificate EKU and SAN (CVE-2017-7562)

    * krb5: Invalid S4U2Self or S4U2Proxy request causes assertion failure (CVE-2017-11368)

    For more details about the security issue(s), including the impact, a CVSS score, and other related     information, refer to the CVE page(s) listed in the References section.

    Additional Changes:

    For detailed information on changes in this release, see the Red Hat Enterprise Linux 7.5 Release Notes     linked from the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Authentication bypass by improper validation of certificate EKU and SAN

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)

Invalid S4U2Self or S4U2Proxy request causes assertion failure

A denial of service flaw was found in MIT Kerberos krb5kdc service. An authenticated attacker could use this flaw to cause krb5kdc to exit with an assertion failure by making an invalid S4U2Self or S4U2Proxy request.( CVE-2017-11368)

The remote NewStart CGSL host, running version MAIN 6.06 (SP), has krb5 packages installed that are affected by multiple vulnerabilities:

  - plugins/preauth/pkinit/pkinit_crypto_openssl.c in MIT Kerberos 5 (aka krb5) through 1.15.2 mishandles     Distinguished Name (DN) fields, which allows remote attackers to execute arbitrary code or cause a denial     of service (buffer overflow and application crash) in situations involving untrusted X.509 data, related     to the get_matching_data and X509_NAME_oneline_ex functions. NOTE: this has security relevance only in use     cases outside of the MIT Kerberos distribution, e.g., the use of get_matching_data in KDC certauth plugin     code that is specific to Red Hat. (CVE-2017-15088)

  - The process_chpw_request function in schpw.c in the password-changing functionality in kadmind in MIT     Kerberos 5 (aka krb5) 1.7 through 1.9 frees an invalid pointer, which allows remote attackers to execute     arbitrary code or cause a denial of service (daemon crash) via a crafted request that triggers an error     condition. (CVE-2011-0285)

  - schpw.c in the kpasswd service in kadmind in MIT Kerberos 5 (aka krb5) before 1.11.3 does not properly     validate UDP packets before sending responses, which allows remote attackers to cause a denial of service     (CPU and bandwidth consumption) via a forged packet that triggers a communication loop, as demonstrated by     krb_pingpong.nasl, a related issue to CVE-1999-0103. (CVE-2002-2443)

  - The (1) ftpd and (2) ksu programs in (a) MIT Kerberos 5 (krb5) up to 1.5, and 1.4.x before 1.4.4, and (b)     Heimdal 0.7.2 and earlier, do not check return codes for setuid calls, which might allow local users to     gain privileges by causing setuid to fail to drop privileges. NOTE: as of 20060808, it is not known     whether an exploitable attack scenario exists for these issues. (CVE-2006-3084)

  - The RPC library in Kerberos 5 1.4 through 1.4.4, and 1.5 through 1.5.1, as used in Kerberos administration     daemon (kadmind) and other products that use this library, calls an uninitialized function pointer in     freed memory, which allows remote attackers to cause a denial of service (crash) and possibly execute     arbitrary code via unspecified vectors. (CVE-2006-6143)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

ID	名称	产品	系列	发布时间	最近更新时间	严重程度
109104	Oracle Linux 7 : krb5 (ELSA-2018-0666)	Nessus	Oracle Linux Local Security Checks	2018/4/18	2024/11/1	medium
147526	EulerOS Virtualization for ARM 64 3.0.2.0 : krb5 (EulerOS-SA-2021-1403)	Nessus	Huawei Local Security Checks	2021/3/10	2024/1/11	high
108983	RHEL 7 : krb5 (RHSA-2018:0666)	Nessus	Red Hat Local Security Checks	2018/4/11	2024/11/7	medium
109689	Amazon Linux 2 : krb5 (ALAS-2018-1010)	Nessus	Amazon Linux Local Security Checks	2018/5/11	2024/10/9	medium
301200	NewStart CGSL MAIN 6.06 (SP) : krb5 Multiple Vulnerabilities (NS-SA-2026-0007)	Nessus	NewStart CGSL Local Security Checks	2026/3/6	2026/3/9	critical

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