An advisory published by the MIT Kerberos team says :

The MIT krb5 KDC database propagation daemon (kpropd) is vulnerable to a denial-of-service attack triggered by invalid network input. If a kpropd worker process receives invalid input that causes it to exit with an abnormal status, it can cause the termination of the listening process that spawned it, preventing the slave KDC it was running on from receiving database updates from the master KDC.

Exploit code is not known to exist, but the vulnerabilities are easy to trigger manually.

An unauthenticated remote attacker can cause kpropd running in standalone mode (the '-S' option) to terminate its listening process, preventing database propagations to the KDC host on which it was running. Configurations where kpropd runs in incremental propagation mode ('iprop') or as an inetd server are not affected.

The remote MiracleLinux 4 host has packages installed that are affected by multiple vulnerabilities as referenced in the AXSA:2011-37:01 advisory.

    Kerberos V5 is a trusted-third-party network authentication system, which can improve your network's     security by eliminating the insecure practice of cleartext passwords.
    Security issues fixed with this release:
    CVE-2010-4022     The do_standalone function in the MIT krb5 KDC database propagation daemon (kpropd) in Kerberos 1.7, 1.8,     and 1.9, when running in standalone mode, does not properly handle when a worker child process exits     abnormally, which allows remote attackers to cause a denial of service (listening process termination, no     new connections, and lack of updates in slave KVC) via unspecified vectors.
    CVE-2011-0281     The unparse implementation in the Key Distribution Center (KDC) in MIT Kerberos 5 (aka krb5) 1.6.x through     1.9, when an LDAP backend is used, allows remote attackers to cause a denial of service (file descriptor     exhaustion and daemon hang) via a principal name that triggers use of a backslash escape sequence, as     demonstrated by a n sequence.
    CVE-2011-0282     The Key Distribution Center (KDC) in MIT Kerberos 5 (aka krb5) 1.6.x through 1.9, when an LDAP backend is     used, allows remote attackers to cause a denial of service (NULL pointer dereference or buffer over-read,     and daemon crash) via a crafted principal name.

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

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

This update incorporates fixes from upstream advisories MITKRB5-SA-2011-001 (standalone kpropd exits if a per-client child exits with an error) and MITKRB5-SA-2011-002 (uninitialized pointer crash in the KDC, hang or crash in the KDC with the LDAP backend).

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

The remote NewStart CGSL host, running version MAIN 6.06, 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
53441	FreeBSD : krb5 -- MITKRB5-SA-2011-001, kpropd denial of service (64f24a1e-66cf-11e0-9deb-f345f3aa24f0)	Nessus	FreeBSD Local Security Checks	2011/4/15	2021/1/6	medium
284433	MiracleLinux 4 : krb5-1.8.2-3.AXS4.4 (AXSA:2011-37:01)	Nessus	Miracle Linux Local Security Checks	2026/1/14	2026/1/14	high
52017	Fedora 13 : krb5-1.7.1-17.fc13 (2011-1210)	Nessus	Fedora Local Security Checks	2011/2/18	2021/1/11	medium
266225	NewStart CGSL MAIN 6.06 : krb5 Multiple Vulnerabilities (NS-SA-2025-0215)	Nessus	NewStart CGSL Local Security Checks	2025/9/30	2025/10/1	critical

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