Buffer overflow in the (1) DWARF (dwarfread.c) and (2) DWARF2 (dwarf2read.c) debugging code in GNU Debugger (GDB) 6.5 allows user-assisted attackers, or restricted users, to execute arbitrary code via a crafted file with a location block (DW_FORM_block) that contains a large number of operations.

From Red Hat Security Advisory 2007:0469 :

An updated gdb package that fixes a security issue and various bugs is now available.

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

GDB, the GNU debugger, allows debugging of programs written in C, C++, and other languages by executing them in a controlled fashion and then printing their data.

Various buffer overflows and underflows were found in the DWARF expression computation stack in GDB. If an attacker could trick a user into loading an executable containing malicious debugging information into GDB, they may be able to execute arbitrary code with the privileges of the user. (CVE-2006-4146)

This updated package also addresses the following issues :

* Support on 64-bit hosts shared libraries debuginfo larger than 2GB.

* Fix a race occasionally leaving the detached processes stopped.

* Fix segmentation fault on the source display by ^X 1.

* Fix a crash on an opaque type dereference.

All users of gdb should upgrade to this updated package, which contains backported patches to resolve these issues.

From Red Hat Security Advisory 2007:0229 :

An updated gdb package that fixes a security issue and various bugs is now available.

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

GDB, the GNU debugger, allows debugging of programs written in C, C++, and other languages by executing them in a controlled fashion and then printing their data.

Various buffer overflows and underflows were found in the DWARF expression computation stack in GDB. If a user loaded an executable containing malicious debugging information into GDB, an attacker might be able to execute arbitrary code with the privileges of the user.
(CVE-2006-4146)

This updated package also addresses the following issues :

* Fixed bogus 0x0 unwind of the thread's topmost function clone(3).

* Fixed deadlock accessing invalid address; for corrupted backtraces.

* Fixed a race which occasionally left the detached processes stopped.

* Fixed 'gcore' command for 32bit debugged processes on 64bit hosts.

* Added support for TLS 'errno' for threaded programs missing its '-debuginfo' package..

* Suggest TLS 'errno' resolving by hand if no threading was found..

* Added a fix to prevent stepping into asynchronously invoked signal handlers.

* Added a fix to avoid false warning on shared objects bfd close on Itanium.

* Fixed segmentation fault on the source display by ^X 1.

* Fixed object names keyboard completion.

* Added a fix to avoid crash of 'info threads' if stale threads exist.

* Fixed a bug where shared libraries occasionally failed to load .

* Fixed handling of exec() called by a threaded debugged program.

* Fixed rebuilding requirements of the gdb package itself on multilib systems.

* Fixed source directory pathname detection for the edit command.

All users of gdb should upgrade to this updated package, which contains backported patches to resolve these issues.

An updated gdb package that fixes a security issue and various bugs is now available.

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

GDB, the GNU debugger, allows debugging of programs written in C, C++, and other languages by executing them in a controlled fashion and then printing their data.

Various buffer overflows and underflows were found in the DWARF expression computation stack in GDB. If a user loaded an executable containing malicious debugging information into GDB, an attacker might be able to execute arbitrary code with the privileges of the user.
(CVE-2006-4146)

This updated package also addresses the following issues :

* Fixed bogus 0x0 unwind of the thread's topmost function clone(3).

* Fixed deadlock accessing invalid address; for corrupted backtraces.

* Fixed a race which occasionally left the detached processes stopped.

* Fixed 'gcore' command for 32bit debugged processes on 64bit hosts.

* Added support for TLS 'errno' for threaded programs missing its '-debuginfo' package..

* Suggest TLS 'errno' resolving by hand if no threading was found..

* Added a fix to prevent stepping into asynchronously invoked signal handlers.

* Added a fix to avoid false warning on shared objects bfd close on Itanium.

* Fixed segmentation fault on the source display by ^X 1.

* Fixed object names keyboard completion.

* Added a fix to avoid crash of 'info threads' if stale threads exist.

* Fixed a bug where shared libraries occasionally failed to load .

* Fixed handling of exec() called by a threaded debugged program.

* Fixed rebuilding requirements of the gdb package itself on multilib systems.

* Fixed source directory pathname detection for the edit command.

All users of gdb should upgrade to this updated package, which contains backported patches to resolve these issues.

Various buffer overflows and underflows were found in the DWARF expression computation stack in GDB. If an attacker could trick a user into loading an executable containing malicious debugging information into GDB, they may be able to execute arbitrary code with the privileges of the user. (CVE-2006-4146)

Various buffer overflows and underflows were found in the DWARF expression computation stack in GDB. If a user loaded an executable containing malicious debugging information into GDB, an attacker might be able to execute arbitrary code with the privileges of the user.
(CVE-2006-4146)

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)

The remote host is affected by the vulnerability described in GLSA-200711-23 (VMware Workstation and Player: Multiple vulnerabilities)

    Multiple vulnerabilities have been discovered in several VMware     products. Neel Mehta and Ryan Smith (IBM ISS X-Force) discovered that     the DHCP server contains an integer overflow vulnerability     (CVE-2007-0062), an integer underflow vulnerability (CVE-2007-0063) and     another error when handling malformed packets (CVE-2007-0061), leading     to stack-based buffer overflows or stack corruption. Rafal Wojtczvk     (McAfee) discovered two unspecified errors that allow authenticated     users with administrative or login privileges on a guest operating     system to corrupt memory or cause a Denial of Service (CVE-2007-4496,     CVE-2007-4497). Another unspecified vulnerability related to untrusted     virtual machine images was discovered (CVE-2007-5617).
    VMware products also shipped code copies of software with several     vulnerabilities: Samba (GLSA-200705-15), BIND (GLSA-200702-06), MIT     Kerberos 5 (GLSA-200707-11), Vixie Cron (GLSA-200704-11), shadow     (GLSA-200606-02), OpenLDAP (CVE-2006-4600), PAM (CVE-2004-0813,     CVE-2007-1716), GCC (CVE-2006-3619) and GDB (CVE-2006-4146).
  Impact :

    Remote attackers within a guest system could possibly exploit these     vulnerabilities to execute code on the host system with elevated     privileges or to cause a Denial of Service.
  Workaround :

    There is no known workaround at this time.

Will Drewry, of the Google Security Team, discovered buffer overflows in GDB's DWARF processing. This would allow an attacker to execute arbitrary code with user privileges by tricking the user into using GDB to load an executable that contained malicious debugging information.

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.

An updated gdb package that fixes a security issue and various bugs is now available.

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

GDB, the GNU debugger, allows debugging of programs written in C, C++, and other languages by executing them in a controlled fashion and then printing their data.

Various buffer overflows and underflows were found in the DWARF expression computation stack in GDB. If an attacker could trick a user into loading an executable containing malicious debugging information into GDB, they may be able to execute arbitrary code with the privileges of the user. (CVE-2006-4146)

This updated package also addresses the following issues :

* Support on 64-bit hosts shared libraries debuginfo larger than 2GB.

* Fix a race occasionally leaving the detached processes stopped.

* Fix segmentation fault on the source display by ^X 1.

* Fix a crash on an opaque type dereference.

All users of gdb should upgrade to this updated package, which contains backported patches to resolve these issues.

The remote Redhat Enterprise Linux 4 host has a package installed that is affected by a vulnerability as referenced in the RHSA-2007:0229 advisory.

    GDB, the GNU debugger, allows debugging of programs written in C, C++, and     other languages by executing them in a controlled fashion and then printing     their data.

    Various buffer overflows and underflows were found in the DWARF expression     computation stack in GDB. If a user loaded an executable containing     malicious debugging information into GDB, an attacker might be able to     execute arbitrary code with the privileges of the user. (CVE-2006-4146)

    This updated package also addresses the following issues:

    * Fixed bogus 0x0 unwind of the thread's topmost function clone(3).

    * Fixed deadlock accessing invalid address; for corrupted backtraces.

    * Fixed a race which occasionally left the detached processes stopped.

    * Fixed 'gcore' command for 32bit debugged processes on 64bit hosts.

    * Added support for TLS 'errno' for threaded programs missing its '-debuginfo' package..

    * Suggest TLS 'errno' resolving by hand if no threading was found..

    * Added a fix to prevent stepping into asynchronously invoked signal handlers.

    * Added a fix to avoid false warning on shared objects bfd close on Itanium.

    * Fixed segmentation fault on the source display by ^X 1.

    * Fixed object names keyboard completion.

    * Added a fix to avoid crash of 'info threads' if stale threads exist.

    * Fixed a bug where shared libraries occasionally failed to load .

    * Fixed handling of exec() called by a threaded debugged program.

    * Fixed rebuilding requirements of the gdb package itself on multilib systems.

    * Fixed source directory pathname detection for the edit command.

    All users of gdb should upgrade to this updated package, which contains     backported patches to resolve these issues.

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

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

ID	Name	Product	Family	Severity
67518	Oracle Linux 3 : gdb (ELSA-2007-0469)	Nessus	Oracle Linux Local Security Checks	medium
67476	Oracle Linux 4 : gdb (ELSA-2007-0229)	Nessus	Oracle Linux Local Security Checks	medium
67042	CentOS 4 : gdb (CESA-2007:0229)	Nessus	CentOS Local Security Checks	medium
60199	Scientific Linux Security Update : gdb on SL3.x i386/x86_64	Nessus	Scientific Linux Local Security Checks	medium
60165	Scientific Linux Security Update : gdb on SL4 i386/x86_64	Nessus	Scientific Linux Local Security Checks	medium
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
28262	GLSA-200711-23 : VMware Workstation and Player: Multiple vulnerabilities	Nessus	Gentoo Local Security Checks	critical
27936	Ubuntu 5.04 / 5.10 / 6.06 LTS : gdb vulnerability (USN-356-1)	Nessus	Ubuntu Local Security Checks	medium
25500	CentOS 3 : gdb (CESA-2007:0469)	Nessus	CentOS Local Security Checks	medium
25481	RHEL 3 : gdb (RHSA-2007:0469)	Nessus	Red Hat Local Security Checks	medium
25138	RHEL 4 : gdb (RHSA-2007:0229)	Nessus	Red Hat Local Security Checks	critical

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