Linux kernel exit_thread allows elevated privileges

linux-exitthread-gain-privileges (16106) The risk level is classified as HighHigh Risk

Description:

Linux kernel could allow a local attacker to gain elevated privileges on the system, caused by a vulnerability in the exit_thread function. The exit_thread function fails to invalidate the per-TSS io_bitmap pointer, which could result in certain processes inheriting IO access permissions. A local attacker could exploit this vulnerability to cause the system to crash or possibly gain root privileges on the system.


Consequences:

Gain Privileges

Remedy:

No remedy available as of July 1, 2014.

References:

  • Linux-Kernel Mailing List, Fri May 07 2004 - 10:11:51 EST : Bug in IO bitmap handling? Probably exploitable (2.6.5).
  • Linux-Kernel Mailing List, Fri May 07 2004 - 11:40:06 EST: Re: Bug in IO bitmap handling? Probably exploitable (2.6.5).
  • BID-10302: Linux Kernel Local IO Access Inheritance Vulnerability
  • CVE-2004-2536: The exit_thread function (process.c) in Linux kernel 2.6 through 2.6.5 does not invalidate the per-TSS io_bitmap pointers if a process obtains IO access permissions from the ioperm function but does not drop those permissions when it exits, which allows other processes to access the per-TSS pointers, access restricted memory locations, and possibly gain privileges.
  • OSVDB ID: 59969: Apache HTTP Server mod_ssl SSL / TLS Renegotiation Handshakes MiTM Plaintext Data Injection
  • OSVDB ID: 5997: Linux Kernel IO Bitmap Access Permissions Inheritance
  • SA11577: Linux Kernel IO Bitmap Access Permissions Inheritance Vulnerability

Platforms Affected:

  • Linux Kernel 2.6.0
  • Linux Kernel 2.6.1 rc2
  • Linux Kernel 2.6.1 rc1
  • Linux Kernel 2.6.1
  • Linux Kernel 2.6.3
  • Linux Kernel 2.6.4
  • Linux Kernel 2.6.5
  • Linux Linux Kernel 2.6.2

Reported:

May 07, 2004

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