Integer signedness error in the gssrpc__svcauth_unix function in svc_auth_unix.c in the RPC library in MIT Kerberos 5 (krb5) 1.6.1 and earlier might allow remote attackers to execute arbitrary code via a negative length value.

The remote Oracle Linux 5 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2007-0562 advisory.

    [1.3.4-49]
     - add patch to fix buffer overflow in kadmind (#239073, CVE-2007-2798)

     [1.3.4-48]
     - add patch to fix buffer overflow and double-free in rpc library (#239073,        CVE-2007-2442/CVE-2007-2443)

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.

From Red Hat Security Advisory 2007:0384 :

Updated krb5 packages that fix several security flaws are now available for Red Hat Enterprise Linux 2.1 and 3.

This update has been rated as having critical security impact by the Red Hat Security Response Team.

Kerberos is a network authentication system which allows clients and servers to authenticate to each other through use of symmetric encryption and a trusted third party, the KDC. kadmind is the KADM5 administration server.

David Coffey discovered an uninitialized pointer free flaw in the RPC library used by kadmind. A remote unauthenticated attacker who can access kadmind could trigger this flaw and cause kadmind to crash or potentially execute arbitrary code as root. (CVE-2007-2442)

David Coffey also discovered an overflow flaw in the RPC library used by kadmind. On Red Hat Enterprise Linux, exploitation of this flaw is limited to a denial of service. A remote unauthenticated attacker who can access kadmind could trigger this flaw and cause kadmind to crash.
(CVE-2007-2443)

A stack-based buffer overflow flaw was found in kadmind. An authenticated attacker who can access kadmind could trigger this flaw and potentially execute arbitrary code on the Kerberos server.
(CVE-2007-2798)

For Red Hat Enterprise Linux 2.1, several portability bugs which would lead to unexpected crashes on the ia64 platform have also been fixed.

Users of krb5-server are advised to update to these erratum packages which contain backported fixes to correct these issues.

David Coffey discovered an uninitialized pointer free flaw in the RPC library used by kadmind. On Scientific Linux 4 and 5, glibc detects attempts to free invalid pointers. A remote unauthenticated attacker who can access kadmind could trigger this flaw and cause kadmind to crash. (CVE-2007-2442)

David Coffey also discovered an overflow flaw in the RPC library used by kadmind. On Scientific Linux, exploitation of this flaw is limited to a denial of service. A remote unauthenticated attacker who can access kadmind could trigger this flaw and cause kadmind to crash.
(CVE-2007-2443)

A stack-based buffer overflow flaw was found in kadmind. An authenticated attacker who can access kadmind could trigger this flaw and potentially execute arbitrary code on the Kerberos server.
(CVE-2007-2798)

David Coffey discovered an uninitialized pointer free flaw in the RPC library used by kadmind. A remote unauthenticated attacker who can access kadmind could trigger this flaw and cause kadmind to crash or potentially execute arbitrary code as root. (CVE-2007-2442)

David Coffey also discovered an overflow flaw in the RPC library used by kadmind. On Scientific Linux, exploitation of this flaw is limited to a denial of service. A remote unauthenticated attacker who can access kadmind could trigger this flaw and cause kadmind to crash.
(CVE-2007-2443)

A stack-based buffer overflow flaw was found in kadmind. An authenticated attacker who can access kadmind could trigger this flaw and potentially execute arbitrary code on the Kerberos server.
(CVE-2007-2798)

s700_800 11.31 KRB5-Client Version 1.3.5.03 Cumulative patch : 

Potential security vulnerabilities have been identified on HP-UX running Kerberos. These vulnerabilities could be exploited by remote unauthenticated users to create a Denial of Service (DoS) or to execute arbitrary code.

s700_800 11.23 KRB5-Client Version 1.0 Cumulative patch : 

Potential security vulnerabilities have been identified on HP-UX running Kerberos. These vulnerabilities could be exploited by remote unauthenticated users to create a Denial of Service (DoS) or to execute arbitrary code.

s700_800 11.11 KRB5-Client Version 1.0 cumulative patch : 

Potential security vulnerabilities have been identified on HP-UX running Kerberos. These vulnerabilities could be exploited by remote unauthenticated users to create a Denial of Service (DoS) or to execute arbitrary code.

Problems addressed by these patches :

I    Arbitrary code execution and denial of service vulnerabilities

     This release fixes a security vulnerability that could allow a      guest operating system user with administrative privileges to cause      memory corruption in a host process, and thus potentially execute      arbitrary code on the host. (CVE-2007-4496)

     This release fixes a denial of service vulnerability that could      allow a guest operating system to cause a host process to become      unresponsive or exit unexpectedly. (CVE-2007-4497)

     Thanks to Rafal Wojtczvk of McAfee for identifying and reporting      these issues.

II   Hosted products DHCP security vulnerabilities addressed

     This release fixes several vulnerabilities in the DHCP server      that could enable a specially crafted packets to gain system-level      privileges. (CVE-2007-0061, CVE-2007-0062, CVE-2007-0063)

     Thanks to Neel Mehta and Ryan Smith of the IBM Internet Security      Systems X-Force for discovering and researching these      vulnerabilities.

III  Windows based hosted product vulnerability in      IntraProcessLogging.dll and vielib.dll.

     This release fixes a security vulnerability that could allow a      malicious remote user to exploit the library file      IntraProcessLogging.dll to overwrite files in a system.
     (CVE-2007-4059)

     This release fixes a security vulnerability that could allow a      malicious remote user to exploit the library file vielib.dll to      overwrite files in a system. (CVE-2007-4155)

     Thanks to the Goodfellas Security Research Team for discovering and      researching these vulnerabilities.

IV  Escalation of privileges on Windows hosted systems

     This release fixes a security vulnerability in which Workstation      was starting registered Windows services in an insecure manner.
     This vulnerability could allow a malicious user to escalate user      privileges.

     Thanks to Foundstone for discovering this vulnerability.

V    Potential denial of service using VMware Player

     This release fixes a problem that prevented VMware Player from      launching. This problem was accompanied by the error message VMware      Player unrecoverable error: (player) Exception 0xc0000005 (access      violation) has occurred.

VI   ESX Service Console updates

a.   Service console package Samba, has been updated to address the      following issues :

     Various bugs were found in NDR parsing, used to decode MS-RPC      requests in Samba. A remote attacker could have sent carefully      crafted requests causing a heap overflow, which may have led to the      ability to execute arbitrary code on the server. (CVE-2007-2446)

     Unescaped user input parameters were being passed as arguments to      /bin/sh. A remote, authenticated, user could have triggered this      flaw and executed arbitrary code on the server. Additionally, this      flaw could be triggered by a remote unauthenticated user if Samba      was configured to use the non-default username map script option.
     (CVE-2007-2447)

     Thanks to the Samba developers, TippingPoint, and iDefense for      identifying and reporting these issues.

     Note: These issues only affect the service console network, and are      not remote vulnerabilities for ESX Server hosts that have been set      up with the security best practices provided by VMware.
     http://www.vmware.com/resources/techresources/726

b.   Updated bind package for the service console fixes a flaw with the      way ISC BIND processed certain DNS query responses.

     ISC BIND (Berkeley Internet Name Domain) is an implementation of      the DNS (Domain Name System) protocols. Under some circumstances, a      malicious remote user could launch a Denial-of-Service attack on      ESX Server hosts that had enabled DNSSEC validation.
     (CVE-2007-0494)

     Note: These issues only affect the service console network, and are      not remote vulnerabilities for ESX Server hosts that have been set      up with the security best practices provided by VMware.
     http://www.vmware.com/resources/techresources/726

c.   This patch provides updated service console package krb5 update.

     The Common Vulnerabilities and Exposures project (cve.mitre.org)      assigned the names CVE-2007-2442, CVE-2007-2443, and CVE-2007-2798      to these security issues.

     Thanks to Wei Wang of McAfee Avert Labs discovered these      vulnerabilities.

     Note: The VMware service console does not provide the kadmind      binary, and is not affected by these issues, but a update has been      provided for completeness.

d.   Service console update for vixie-cron

     This patch provides an updated service console package vixie-cron.
     Cron is a standard UNIX daemon that runs specified programs at      scheduled times.

     A denial of service issue was found in the way vixie-cron verified      crontab file integrity. A local user with the ability to create a      hardlink to /etc/crontab could potentially prevent vixie-cron from      executing certain system cron jobs. (CVE-2007-1856)

     Thanks to Raphael Marichez for identifying this issue.

e.   Service console update for shadow-utils

     This patch provides an updated shadow-utils package.  A new      user's mailbox, when created, could have random permissions for a      short period. This could enable a local malicious user to      read or modify the mailbox. (CVE-2006-1174)

f.  Service console update for OpenLDAP

     This patch provides a updated OpenLDAP package. A flaw could      allow users with selfwrite access to modify the distinguished      name of any user, instead of being limited to modify only      their own distinguished name. (CVE-2006-4600)

g.   Service console update for PAM

     This patch provides an updated PAM package A vulnerability was      found that could allow console users with access to certain device      files to cause damage to recordable CD drives. Certain file      permissions have now been modified to disallow access.
     (CVE-2004-0813)

     A flaw was found with console device permissions. It was possible      for various console devices to retain ownership of the previoius      console user after logging out, which could result in leakage of      information to an unauthorized user. (CVE-2007-1716)

h.   Service console update for GCC

     This patch provides security fixes for the service console GNU      Compiler Collection (GCC) packages that include C, C++, Java,      Fortran 77, Objective C, and Ada 95 GNU compilers and related      support libraries.

     A flaw was found in the fastjar utility that could potentially      allow a malicious user to create a JAR file which, if unpacked      using fastjar, could write to any file that an authorized user had      write access to. (CVE-2006-3619)

     Thanks to J&uuml;rgen Weigert for identifying this issue.

i.   Service Console update for GDB

     This patch provides a security fix for the service console GNU      debugger (GDB).  Various vulnerabilities were found in GDB. These      vulnerabilities may allow a malicious user to deceive a user into      loading debugging information into GDB, enabling the execution of      arbitrary code with the privileges of the user. (CVE-2006-4146)

This update fixes a stack-based buffer overflow in kadmind which can be exploited by authenticated remote users to gain root.
(CVE-2007-2798) Additionally two bugs in the RPC library of kadmind were fixed that can lead to remote system compromise. (CVE-2007-2442 / CVE-2007-2443) Note that third-party applications using the RPC library are vulnerable, too.

Wei Wang discovered that the krb5 RPC library did not correctly handle certain error conditions. A remote attacker could cause kadmind to free an uninitialized pointer, leading to a denial of service or possibly execution of arbitrary code with root privileges.
(CVE-2007-2442)

Wei Wang discovered that the krb5 RPC library did not correctly check the size of certain communications. A remote attacker could send a specially crafted request to kadmind and execute arbitrary code with root privileges. (CVE-2007-2443)

It was discovered that the kadmind service could be made to overflow its stack. A remote attacker could send a specially crafted request and execute arbitrary code with root privileges. (CVE-2007-2798).

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

This update incorporates fixes for a stack-based buffer overflow and heap corruption in the RPC library, and a fix for a potential stack-based buffer overflow in kadmind.

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.

This update fixes a stack-based buffer overflow in kadmind which can be exploited by authenticated remote users to gain root.
(CVE-2007-2798) Additionally two bugs in the RPC library of kadmind were fixed that can lead to remote system compromise. (CVE-2007-2442, CVE-2007-2443) Note that third-party applications using the RPC library are vulnerable, too.

The remote host is running a version of Mac OS X 10.4 or 10.3 which does not have the security update 2007-007 applied. 

This update contains several security fixes for the following programs :

 - bzip2
 - CFNetwork
 - CoreAudio
 - cscope
 - gnuzip
 - iChat
 - Kerberos
 - mDNSResponder
 - PDFKit
 - PHP
 - Quartz Composer
 - Samba
 - SquirrelMail
 - Tomcat
 - WebCore
 - WebKit

The remote host is affected by the vulnerability described in GLSA-200707-11 (MIT Kerberos 5: Arbitrary remote code execution)

    kadmind is affected by multiple vulnerabilities in the RPC library     shipped with MIT Kerberos 5. It fails to properly handle zero-length     RPC credentials (CVE-2007-2442) and the RPC library can write past the     end of the stack buffer (CVE-2007-2443). Furthermore kadmind fails to     do proper bounds checking (CVE-2007-2798).
  Impact :

    A remote unauthenticated attacker could exploit these vulnerabilities     to execute arbitrary code with root privileges.
  Workaround :

    There is no known workaround at this time.

Several remote vulnerabilities have been discovered in the MIT reference implementation of the Kerberos network authentication protocol suite, which may lead to the execution of arbitrary code. The Common Vulnerabilities and Exposures project identifies the following problems :

  - CVE-2007-2442     Wei Wang discovered that the free of an uninitialised     pointer in the Kerberos RPC library may lead to the     execution of arbitrary code.

  - CVE-2007-2443     Wei Wang discovered that insufficient input sanitising     in the Kerberos RPC library may lead to the execution of     arbitrary code.

  - CVE-2007-2798     It was discovered that a buffer overflow in the Kerberos     administration daemon may lead to the execution of     arbitrary code.

Updated krb5 packages that fix several security flaws are now available for Red Hat Enterprise Linux 4 and 5.

This update has been rated as having important security impact by the Red Hat Security Response Team.

Kerberos is a network authentication system which allows clients and servers to authenticate to each other through use of symmetric encryption and a trusted third party, the KDC. kadmind is the KADM5 administration server.

David Coffey discovered an uninitialized pointer free flaw in the RPC library used by kadmind. On Red Hat Enterprise Linux 4 and 5, glibc detects attempts to free invalid pointers. A remote unauthenticated attacker who can access kadmind could trigger this flaw and cause kadmind to crash. (CVE-2007-2442)

David Coffey also discovered an overflow flaw in the RPC library used by kadmind. On Red Hat Enterprise Linux, exploitation of this flaw is limited to a denial of service. A remote unauthenticated attacker who can access kadmind could trigger this flaw and cause kadmind to crash.
(CVE-2007-2443)

A stack-based buffer overflow flaw was found in kadmind. An authenticated attacker who can access kadmind could trigger this flaw and potentially execute arbitrary code on the Kerberos server.
(CVE-2007-2798)

Users of krb5-server are advised to update to these erratum packages which contain backported fixes to correct these issues.

Updated krb5 packages that fix several security flaws are now available for Red Hat Enterprise Linux 2.1 and 3.

This update has been rated as having critical security impact by the Red Hat Security Response Team.

Kerberos is a network authentication system which allows clients and servers to authenticate to each other through use of symmetric encryption and a trusted third party, the KDC. kadmind is the KADM5 administration server.

David Coffey discovered an uninitialized pointer free flaw in the RPC library used by kadmind. A remote unauthenticated attacker who can access kadmind could trigger this flaw and cause kadmind to crash or potentially execute arbitrary code as root. (CVE-2007-2442)

David Coffey also discovered an overflow flaw in the RPC library used by kadmind. On Red Hat Enterprise Linux, exploitation of this flaw is limited to a denial of service. A remote unauthenticated attacker who can access kadmind could trigger this flaw and cause kadmind to crash.
(CVE-2007-2443)

A stack-based buffer overflow flaw was found in kadmind. An authenticated attacker who can access kadmind could trigger this flaw and potentially execute arbitrary code on the Kerberos server.
(CVE-2007-2798)

For Red Hat Enterprise Linux 2.1, several portability bugs which would lead to unexpected crashes on the ia64 platform have also been fixed.

Users of krb5-server are advised to update to these erratum packages which contain backported fixes to correct these issues.

David Coffey discovered an uninitialized pointer free flaw in the RPC library used by kadmind. A remote unauthenticated attacker who could access kadmind could trigger the flaw causing kadmind to crash or possibly execute arbitrary code (CVE-2007-2442).

David Coffey also discovered an overflow flaw in the same RPC library.
A remote unauthenticated attacker who could access kadmind could trigger the flaw causing kadmind to crash or possibly execute arbitrary code (CVE-2007-2443).

Finally, a stack-based buffer overflow vulnerability was found in kadmind that allowed an unauthenticated user able to access kadmind the ability to trigger the vulnerability and possibly execute arbitrary code (CVE-2007-2798).

Updated packages have been patched to prevent this issue.

ID	Name	Product	Family	Severity
67535	Oracle Linux 5 : Important: / krb5 (ELSA-2007-0562)	Nessus	Oracle Linux Local Security Checks	critical
67503	Oracle Linux 3 : krb5 (ELSA-2007-0384)	Nessus	Oracle Linux Local Security Checks	high
60219	Scientific Linux Security Update : krb5 on SL5.x, SL4.x, SL3.x i386/x86_64	Nessus	Scientific Linux Local Security Checks	high
60218	Scientific Linux Security Update : krb5 on SL3.x i386/x86_64	Nessus	Scientific Linux Local Security Checks	high
47149	HP-UX PHSS_41168 : HP-UX Running Kerberos, Remote Denial of Service (DoS), Execution of Arbitrary Code (HPSBUX02544 SSRT100107 rev.1)	Nessus	HP-UX Local Security Checks	high
47148	HP-UX PHSS_41167 : HP-UX Running Kerberos, Remote Denial of Service (DoS), Execution of Arbitrary Code (HPSBUX02544 SSRT100107 rev.1)	Nessus	HP-UX Local Security Checks	high
47147	HP-UX PHSS_41166 : HP-UX Running Kerberos, Remote Denial of Service (DoS), Execution of Arbitrary Code (HPSBUX02544 SSRT100107 rev.1)	Nessus	HP-UX Local Security Checks	high
40370	VMSA-2007-0006 : Critical security updates for all supported versions of VMware ESX Server, VMware Server, VMware Workstation, VMware ACE, and VMware Player	Nessus	VMware ESX Local Security Checks	critical
29493	SuSE 10 Security Update : krb5 (ZYPP Patch Number 3821)	Nessus	SuSE Local Security Checks	high
28078	Ubuntu 6.06 LTS / 6.10 / 7.04 : krb5 vulnerabilities (USN-477-1)	Nessus	Ubuntu Local Security Checks	high
27678	Fedora 7 : krb5-1.6.1-2.1.fc7 (2007-0740)	Nessus	Fedora Local Security Checks	high
27309	openSUSE 10 Security Update : krb5 (krb5-3820)	Nessus	SuSE Local Security Checks	high
25830	Mac OS X Multiple Vulnerabilities (Security Update 2007-007)	Nessus	MacOS X Local Security Checks	critical
25793	GLSA-200707-11 : MIT Kerberos 5: Arbitrary remote code execution	Nessus	Gentoo Local Security Checks	high
25628	Debian DSA-1323-1 : krb5 - several vulnerabilities	Nessus	Debian Local Security Checks	high
25611	RHEL 4 / 5 : krb5 (RHSA-2007:0562)	Nessus	Red Hat Local Security Checks	high
25604	RHEL 2.1 / 3 : krb5 (RHSA-2007:0384)	Nessus	Red Hat Local Security Checks	high
25603	Mandrake Linux Security Advisory : krb5 (MDKSA-2007:137)	Nessus	Mandriva Local Security Checks	high
25580	CentOS 4 / 5 : krb5 (CESA-2007:0562)	Nessus	CentOS Local Security Checks	high
25574	CentOS 3 : krb5 (CESA-2007:0384)	Nessus	CentOS Local Security Checks	high

Detections

Analytics

CVE-2007-2443

critical

Tenable Plugins

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