This update incorporates patches to fix potential read overflow and NULL pointer dereferences in the implementation of the SPNEGO GSSAPI mechanism (CVE-2009-0844, CVE-2009-0845), attempts to free an uninitialized pointer during protocol parsing (CVE-2009-0846), and a bug in length validation during protocol parsing (CVE-2009-0847).

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.

Several vulnerabilities have been found in the MIT reference implementation of Kerberos V5, a system for authenticating users and services on a network. The Common Vulnerabilities and Exposures project identified the following problems :

  - CVE-2009-0844     The Apple Product Security team discovered that the     SPNEGO GSS-API mechanism suffers of a missing bounds     check when reading a network input buffer which results     in an invalid read crashing the application or possibly     leaking information.

  - CVE-2009-0845     Under certain conditions the SPNEGO GSS-API mechanism     references a NULL pointer which crashes the application     using the library.

  - CVE-2009-0847     An incorrect length check inside the ASN.1 decoder of     the MIT krb5 implementation allows an unauthenticated     remote attacker to crash of the kinit or KDC program.

  - CVE-2009-0846     Under certain conditions the the ASN.1 decoder of the     MIT krb5 implementation frees an uninitialized pointer     which could lead to denial of service and possibly     arbitrary code execution.

Clients sending negotiation requests with invalid flags could crash the kerberos server (CVE-2009-0845).

GSS-API clients could crash when reading from an invalid address space (CVE-2009-0844).

Invalid length checks could crash applications using the kerberos ASN.1 parser (CVE-2009-0847).

Under certain circumstances the ASN.1 parser could free an uninitialized pointer which could crash a kerberos server or even lead to execution of arbitrary code (CVE-2009-0846).

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
36108	Fedora 9 : krb5-1.6.3-16.fc9 (2009-2834)	Nessus	Fedora Local Security Checks	2009/4/8	2021/1/11	critical
36120	Debian DSA-1766-1 : krb5 - several vulnerabilities	Nessus	Debian Local Security Checks	2009/4/9	2021/1/4	critical
36122	openSUSE 10 Security Update : krb5 (krb5-6139)	Nessus	SuSE Local Security Checks	2009/4/9	2021/1/14	critical
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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