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Message-ID: <5e818bea.124fe.15259ebc9f3.Coremail.xiaoqixue_1@163.com>
Date: Tue, 19 Jan 2016 20:46:10 +0800 (CST)
From: xiaoqixue_1 <xiaoqixue_1@....com>
To: oss-security@...ts.openwall.com
Cc: cve-assign@...re.org
Subject: Re:Re: Buffer Overflow in lha compression utility
an out of bound read is found in libdwarf -20151114.
please see attachment for poc. the result of valgrind as follows:
==============================
===========================
*** DWARF CHECK: DW_DLE_DEBUG_FRAME_LENGTH_NOT_MULTIPLE
len=0x00000010, len size=0x00000004, extn size=0x00000000, totl
length=0x00000014, addr size=0x00000008, mod=0x00000004 must be zero
in cie, offset 0x00000000. ***
7 ==53495== Invalid read of size 2
1 ==53495== at 0x4C2F7E0: memcpy@@GLIBC_2.14 (in
/usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
2 ==53495== by 0x43287F: dwarf_read_cie_fde_prefix (dwarf_frame2.c:934)
3 ==53495== by 0x431305: _dwarf_get_fde_list_internal (dwarf_frame2.c:268)
4 ==53495== by 0x42EB5F: dwarf_get_fde_list_eh (dwarf_frame.c:1101)
5 ==53495== by 0x41BABE: print_frames (print_frames.c:1835)
6 ==53495== by 0x40485B: process_one_file (dwarfdump.c:1323)
7 ==53495== by 0x403529: main (dwarfdump.c:630)
8 ==53495== Address 0x548b3c0 is 0 bytes inside a block of size 1 alloc'd
9 ==53495== at 0x4C2AB80: malloc (in
/usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
10 ==53495== by 0x4E40600: ??? (in
/usr/lib/x86_64-linux-gnu/libelf-0.158.so)
11 ==53495== by 0x4E40873: ??? (in
/usr/lib/x86_64-linux-gnu/libelf-0.158.so)
12 ==53495== by 0x42A0E1: dwarf_elf_object_access_load_section
(dwarf_elf_access.c:1230)
13 ==53495== by 0x437715: _dwarf_load_section (dwarf_init_finish.c:1072)
14 ==53495== by 0x42EAEB: dwarf_get_fde_list_eh (dwarf_frame.c:1096)
15 ==53495== by 0x41BABE: print_frames (print_frames.c:1835)
16 ==53495== by 0x40485B: process_one_file (dwarfdump.c:1323)
17 ==53495== by 0x403529: main (dwarfdump.c:630)
18 ==53495==
The vulnerability is found by Qixue Xiao, at Tsinghua University.
Content of type "text/html" skipped
Download attachment "awbug5.elf" of type "application/octet-stream" (7875 bytes)
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