Reports and Resources
Null pointer dereference in H5Fquery.c – HDF5 – 1.13.0
Loginsoft-2020-1003
11 March, 2020
CVE Number
CVE-2020-10812
CWE
CWE – 476 : NULL Pointer Dereference
Product Details
HDF5 is a data model, library, and file format for storing and managing data. It supports an unlimited variety of data types and is designed for flexible and efficient I/O and for high volume and complex data. HDF5 is portable and is extensible, allowing applications to evolve in their use of HDF5. The HDF5 Technology suite includes tools and applications for managing, manipulating, viewing, and analyzing data in the HDF5 format.
URL: https://www.hdfgroup.org/downloads
Vulnerable Versions
1.13.0
Vulnerability Details
During our research we observed NULL pointer dereference in the function H5F_get_nrefs() located in H5Fquery.c. The same be triggered by sending a crafted file to the h5debug binary. It allows an attacker to cause Denial of Service.
SYNOPSIS
During our research on hdf5, when function H5VL__native_file_close() called in from H5VLnative_file.c to Handle the file close callback this calls another function H5F_get_nrefs() located in H5Fquery.c to Retrieve the file’s ‘nrefs’ value, here in line FUNC_LEAVE_NOAPI(f->shared->nrefs) while fetching the value of f->shared->nrefs at this time the value of f->shared is pointing to null and it triggers the null pointer dereference.
Vulnerable Source Code
H5F_get_nrefs(const H5F_t *f)
{
/* Use FUNC_ENTER_NOAPI_NOINIT_NOERR here to avoid performance issues */
FUNC_ENTER_NOAPI_NOINIT_NOERR
HDassert(f);
HDassert(f->shared);
FUNC_LEAVE_NOAPI(f->shared->nrefs)
} /* end H5F_get_nrefs() */
Analysis
DEBUG:
GDB:
Starting program: /hdf5/build/bin/h5debug POC
Reading signature at address 0 (rel)
File Super Block...
File name (as opened): POC
File name (after resolving symlinks): POC
File access flags 0x00000000
File open reference count: 1
Address of super block: 0 (abs)
Size of userblock: 0 bytes
Superblock version number: 2
Free list version number: 0
Root group symbol table entry version number: 0
Shared header version number: 0
Size of file offsets (haddr_t type): 8 bytes
Size of file lengths (hsize_t type): 8 bytes
Symbol table leaf node 1/2 rank: 4
Symbol table internal node 1/2 rank: 16
Indexed storage internal node 1/2 rank: 32
File status flags: 0x00
Superblock extension address: 48 (rel)
Shared object header message table address: UNDEF (rel)
Shared object header message version number: 0
Number of shared object header message indexes: 0
Address of driver information block: UNDEF (rel)
Root group symbol table entry:
Name offset into private heap: 0
Object header address: 200
Cache info type: Nothing Cached
Program received signal SIGSEGV, Segmentation fault.
[ Legend: Modified register | Code | Heap | Stack | String ]
──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────── registers ────
$rax : 0x0
$rbx : 0xffffffffffffffff
$rcx : 0x0
$rdx : 0x0
$rsp : 0x00007fffffffd948 → 0x0000000000613bea → cmp eax, 0x1
$rbp : 0x000000000078ed90 → 0x0000000000000000
$rsi : 0xb00000000000008
$rdi : 0x000000000078ed90 → 0x0000000000000000
$rip : 0x00000000004883b4 → mov eax, DWORD PTR [rax+0x1c]
$r8 : 0x1
$r9 : 0x5
$r10 : 0x0
$r11 : 0x00007fffffffdaa1 → 0x1d00706f745f542c (",T_top"?)
$r12 : 0x000000000074aa70 → 0x0000000000000001
$r13 : 0xb00000000000008
$r14 : 0x0
$r15 : 0x64
$eflags: [zero carry PARITY adjust sign trap INTERRUPT direction overflow RESUME virtualx86 identification]
$cs: 0x0033 $ss: 0x002b $ds: 0x0000 $es: 0x0000 $fs: 0x0000 $gs: 0x0000
──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────── stack ────
0x00007fffffffd948│+0x0000: 0x0000000000613bea → cmp eax, 0x1 ← $rsp
0x00007fffffffd950│+0x0008: 0x000000000074aa70 → 0x0000000000000001
0x00007fffffffd958│+0x0010: 0xffffffffffffffff
0x00007fffffffd960│+0x0018: 0x0000000000790fc0 → 0x0000000000000001
0x00007fffffffd968│+0x0020: 0x0000000000790f60 → 0x000000000078ed90 → 0x0000000000000000
0x00007fffffffd970│+0x0028: 0x0000000000000000
0x00007fffffffd978│+0x0030: 0x00000000005fae9f → test eax, eax
0x00007fffffffd980│+0x0038: 0x000000000074aa70 → 0x0000000000000001
────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────── code:x86:64 ────
0x4883a2 data16 nop WORD PTR cs:[rax+rax*1+0x0]
0x4883ad nop DWORD PTR [rax]
0x4883b0 mov rax, QWORD PTR [rdi+0x10]
→ 0x4883b4 mov eax, DWORD PTR [rax+0x1c]
0x4883b7 ret
0x4883b8 nop DWORD PTR [rax+rax*1+0x0]
0x4883c0 mov rax, QWORD PTR [rdi+0x10]
0x4883c4 mov rax, QWORD PTR [rax+0x560]
0x4883cb ret
──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────── source:/h[...].c+601 ────
596 FUNC_ENTER_NOAPI_NOINIT_NOERR
597
598 HDassert(f);
599 HDassert(f->shared);
600
→ 601 FUNC_LEAVE_NOAPI(f->shared->nrefs)
602 } /* end H5F_get_nrefs() */
603
604
605 /*-------------------------------------------------------------------------
606 * Function: H5F_rdcc_nslots
────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────── threads ────
[#0] Id 1, Name: "h5debug", stopped, reason: SIGSEGV
──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────── trace ────
[#0] 0x4883b4 → H5F_get_nrefs(f=0x78ed90)
[#1] 0x613bea → H5VL__native_file_close(file=0x78ed90, dxpl_id=, req=)
[#2] 0x5fae9f → H5VL__file_close(obj=, dxpl_id=0xb00000000000008, req=0x0, cls=)
[#3] 0x603245 → H5VL_file_close(vol_obj=0x790f60, dxpl_id=0xb00000000000008, req=0x0)
[#4] 0x47742d → H5F__close_cb(file_vol_obj=0x790f60)
[#5] 0x4d7aef → H5I__clear_type_cb(_id=0x790f80, key=, _udata=0x7fffffffda50)
[#6] 0x579083 → H5SL_try_free_safe(slist=0x78d270, op=0x4d7ab0 , op_data=0x7fffffffda50)
[#7] 0x4d86dd → H5I_clear_type(type=H5I_FILE, force=0x0, app_ref=0x0)
[#8] 0x47760c → H5F_term_package()
[#9] 0x403f77 → H5_term_library()
───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
0x00000000004883b4 in H5F_get_nrefs (f=f@entry=0x78ed90) at /hdf5/src/H5Fquery.c:601
601 FUNC_LEAVE_NOAPI(f->shared->nrefs)
gef➤ bt
#0 0x00000000004883b4 in H5F_get_nrefs (f=f@entry=0x78ed90) at /hdf5/src/H5Fquery.c:601
#1 0x0000000000613bea in H5VL__native_file_close (file=0x78ed90, dxpl_id=, req=) at /hdf5/src/H5VLnative_file.c:869
#2 0x00000000005fae9f in H5VL__file_close (obj=, dxpl_id=dxpl_id@entry=0xb00000000000008, req=req@entry=0x0, cls=) at /hdf5/src/H5VLcallback.c:3945
#3 0x0000000000603245 in H5VL_file_close (vol_obj=vol_obj@entry=0x790f60, dxpl_id=0xb00000000000008, req=req@entry=0x0) at /hdf5/src/H5VLcallback.c:3977
#4 0x000000000047742d in H5F__close_cb (file_vol_obj=0x790f60) at /hdf5/src/H5F.c:242
#5 0x00000000004d7aef in H5I__clear_type_cb (_id=0x790f80, key=, _udata=0x7fffffffda50) at /hdf5/src/H5I.c:611
#6 0x0000000000579083 in H5SL_try_free_safe (slist=0x78d270, op=op@entry=0x4d7ab0 , op_data=op_data@entry=0x7fffffffda50) at /hdf5/src/H5SL.c:2369
#7 0x00000000004d86dd in H5I_clear_type (type=type@entry=H5I_FILE, force=force@entry=0x0, app_ref=app_ref@entry=0x0) at /hdf5/src/H5I.c:571
#8 0x000000000047760c in H5F_term_package () at /hdf5/src/H5F.c:194
#9 0x0000000000403f77 in H5_term_library () at /hdf5/src/H5.c:323
#10 0x00007ffff7485041 in __run_exit_handlers (status=0x0, listp=0x7ffff782d718 , run_list_atexit=run_list_atexit@entry=0x1, run_dtors=run_dtors@entry=0x1) at exit.c:108
#11 0x00007ffff748513a in __GI_exit (status=) at exit.c:139
#12 0x00007ffff7463b9e in __libc_start_main (main=0x402720 , argc=0x2, argv=0x7fffffffe018, init=, fini=, rtld_fini=, stack_end=0x7fffffffe008) at ../csu/libc-start.c:344
#13 0x000000000040370a in _start ()
gef➤ i r
rax 0x0 0x0
rbx 0xffffffffffffffff 0xffffffffffffffff
rcx 0x0 0x0
rdx 0x0 0x0
rsi 0xb00000000000008 0xb00000000000008
rdi 0x78ed90 0x78ed90
rbp 0x78ed90 0x78ed90
rsp 0x7fffffffd948 0x7fffffffd948
r8 0x1 0x1
r9 0x5 0x5
r10 0x0 0x0
r11 0x7fffffffdaa1 0x7fffffffdaa1
r12 0x74aa70 0x74aa70
r13 0xb00000000000008 0xb00000000000008
r14 0x0 0x0
r15 0x64 0x64
rip 0x4883b4 0x4883b4
eflags 0x10206 [ PF IF RF ]
cs 0x33 0x33
ss 0x2b 0x2b
ds 0x0 0x0
es 0x0 0x0
fs 0x0 0x0
gs 0x0 0x0
gef➤ p f->shared->nrefs
Cannot access memory at address 0x1c
gef➤ p f->shared
$1 = (H5F_shared_t *) 0x0
gef➤ ptype f
type = const struct H5F_t {
char *open_name;
char *actual_name;
H5F_shared_t *shared;
H5VL_object_t *vol_obj;
unsigned int nopen_objs;
H5FO_t *obj_count;
hbool_t id_exists;
hbool_t closing;
struct H5F_t *parent;
unsigned int nmounts;
} *
ASAN Output:
Reading signature at address 0 (rel)
File Super Block...
File name (as opened): POC
File name (after resolving symlinks): POC
File access flags 0x00000000
File open reference count: 1
Address of super block: 0 (abs)
Size of userblock: 0 bytes
Superblock version number: 2
Free list version number: 0
Root group symbol table entry version number: 0
Shared header version number: 0
Size of file offsets (haddr_t type): 8 bytes
Size of file lengths (hsize_t type): 8 bytes
Symbol table leaf node 1/2 rank: 4
Symbol table internal node 1/2 rank: 16
Indexed storage internal node 1/2 rank: 32
File status flags: 0x00
Superblock extension address: 48 (rel)
Shared object header message table address: UNDEF (rel)
Shared object header message version number: 0
Number of shared object header message indexes: 0
Address of driver information block: UNDEF (rel)
Root group symbol table entry:
Name offset into private heap: 0
Object header address: 200
Cache info type: Nothing Cached
ASAN:DEADLYSIGNAL
=================================================================
==20845==ERROR: AddressSanitizer: SEGV on unknown address 0x00000000001c (pc 0x55a9417f4aff bp 0x6070000001e0 sp 0x7ffe5115db20 T0)
==20845==The signal is caused by a READ memory access.
==20845==Hint: address points to the zero page.
#0 0x55a9417f4afe in H5F_get_nrefs /hdf5/src/H5Fquery.c:601
#1 0x55a941c12240 in H5VL__native_file_close /hdf5/src/H5VLnative_file.c:869
#2 0x55a941bd67ac in H5VL__file_close /hdf5/src/H5VLcallback.c:3945
#3 0x55a941be8bef in H5VL_file_close /hdf5/src/H5VLcallback.c:3977
#4 0x55a9417c7353 in H5F__close_cb /hdf5/src/H5F.c:242
#5 0x55a9418d14ea in H5I__clear_type_cb /hdf5/src/H5I.c:611
#6 0x55a941a8fad2 in H5SL_try_free_safe /hdf5/src/H5SL.c:2369
#7 0x55a9418d3086 in H5I_clear_type /hdf5/src/H5I.c:571
#8 0x55a9417c768b in H5F_term_package /hdf5/src/H5F.c:194
#9 0x55a94168ce4e in H5_term_library /hdf5/src/H5.c:323
#10 0x7f9de98ba040 (/lib/x86_64-linux-gnu/libc.so.6+0x43040)
#11 0x7f9de98ba139 in exit (/lib/x86_64-linux-gnu/libc.so.6+0x43139)
#12 0x7f9de9898b9d in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x21b9d)
#13 0x55a94168c049 in _start (/hdf5/build1/bin/h5debug+0x148049)
AddressSanitizer can not provide additional info.
SUMMARY: AddressSanitizer: SEGV /hdf5/src/H5Fquery.c:601 in H5F_get_nrefs
==20845==ABORTING
Proof of Concept./h5debug $POC
Vendor Disclosure: 2020-3-10
Credit
Discovered by ACE Team – Loginsoft
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