[Bug tools/23754] New: NULL-Pointer dereference problem in function do_oper_extract in the eu-ar binaries

[Bug tools/23754] New: NULL-Pointer dereference problem in function do_oper_extract in the eu-ar binaries

[wcventure at 126 dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=23754

            Bug ID: 23754
           Summary: NULL-Pointer dereference problem in function
                    do_oper_extract in the eu-ar binaries
           Product: elfutils
           Version: unspecified
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: tools
          Assignee: unassigned at sourceware dot org
          Reporter: wcventure at 126 dot com
                CC: elfutils-devel at sourceware dot org
  Target Milestone: ---

Hi,

Our fuzzer caught NULL-Pointer dereference problems in eu-ar.c in the latest
elfutils(v0.174) code base, those inputs will cause the signal SIGSEGV,
Segmentation fault. I have confirmed them with address sanitizer. 

Please use the “ ./eu-ar -tv $POC ” to reproduce the bug. If you have any
questions, please let me know. Thank you.

The ASAN dumps the stack trace as follows:

ASAN:DEADLYSIGNAL
=================================================================
==24906==ERROR: AddressSanitizer: SEGV on unknown address 0x000000000030 (pc
0x7fb225ed3071 bp 0x7fffdbcb2a50 sp 0x7fffdbcb2370 T0)
==24906==The signal is caused by a READ memory access.
==24906==Hint: address points to the zero page.
    #0 0x7fb225ed3070  (/lib/x86_64-linux-gnu/libc.so.6+0xc3070)
    #1 0x7fb225ed50a5 in __strftime_l (/lib/x86_64-linux-gnu/libc.so.6+0xc50a5)
    #2 0x404574 in do_oper_extract
/mnt/c/wcventure/Fuzzing_Object/elfutils-0.174/src/ar.c:542
    #3 0x403203 in main
/mnt/c/wcventure/Fuzzing_Object/elfutils-0.174/src/ar.c:252
    #4 0x7fb225e3082f in __libc_start_main
(/lib/x86_64-linux-gnu/libc.so.6+0x2082f)
    #5 0x402428 in _start
(/mnt/c/wcventure/Fuzzing_Object/elfutils-0.174/build/bin/eu-ar+0x402428)

AddressSanitizer can not provide additional info.
SUMMARY: AddressSanitizer: SEGV (/lib/x86_64-linux-gnu/libc.so.6+0xc3070)
==24906==ABORTING

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[Bug tools/23754] NULL-Pointer dereference problem in function do_oper_extract in the eu-ar binaries

[wcventure at 126 dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=23754

--- Comment #1 from wcventure <wcventure at 126 dot com> ---
Created attachment 11309
  --> https://sourceware.org/bugzilla/attachment.cgi?id=11309&action=edit
POC1-ar

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[Bug tools/23754] NULL-Pointer dereference problem in function do_oper_extract in the eu-ar binaries

[wcventure at 126 dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=23754

--- Comment #2 from wcventure <wcventure at 126 dot com> ---
Created attachment 11310
  --> https://sourceware.org/bugzilla/attachment.cgi?id=11310&action=edit
POC2-ar

Please use the "./eu-ar -tv $POC" to reproduce the bug.

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[Bug tools/23754] NULL-Pointer dereference problem in function do_oper_extract in the eu-ar binaries

[mark at klomp dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=23754

Mark Wielaard <mark at klomp dot org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |ASSIGNED
   Last reconfirmed|                            |2018-10-14
                 CC|                            |mark at klomp dot org
     Ever confirmed|0                           |1

--- Comment #3 from Mark Wielaard <mark at klomp dot org> ---
localtime could return NULL when the ar_date was bogus. Proposed workaround:
https://sourceware.org/ml/elfutils-devel/2018-q4/msg00028.html

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[Bug tools/23754] NULL-Pointer dereference problem in function do_oper_extract in the eu-ar binaries

[wcventure at 126 dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=23754

--- Comment #4 from wcventure <wcventure at 126 dot com> ---
Thanks for paying attention to this problem and proposing to fix it in time.
This bug was discovered by NTU Cyber-Security-Lab, for fuzzing research work.

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[Bug tools/23754] NULL-Pointer dereference problem in function do_oper_extract in the eu-ar binaries

[mark at klomp dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=23754

Mark Wielaard <mark at klomp dot org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |RESOLVED
         Resolution|---                         |FIXED

--- Comment #5 from Mark Wielaard <mark at klomp dot org> ---
commit 4cdb0fd0d3b4255a9994ce302d6df76d251f7b75
Author: Mark Wielaard <mark@klomp.org>
Date:   Sun Oct 14 17:29:51 2018 +0200

    ar: Assume epoch if ar_date is bogus.

    If the ar header contains a bogus ar_date then in verbose mode we would
    get a NULL pointer from localtime. Just assume the entry was created
    during the epoch.

    https://sourceware.org/bugzilla/show_bug.cgi?id=23754

    Signed-off-by: Mark Wielaard <mark@klomp.org>

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