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Message-ID: <312509.123326407-sendEmail@localhost>
Date: Mon, 10 Apr 2017 07:43:59 +0000
From: "Agostino Sarubbo" <ago@...too.org>
To: "oss-security@...ts.openwall.com" <oss-security@...ts.openwall.com>
Subject: elfutils: memory allocation failure in xcalloc (xmalloc.c)
Description:
elfutils is a set of libraries/utilities to handle ELF objects (drop in replacement for libelf).
A fuzz on eu-elflint showed a memory allocation failure.
The interesting ASan output:
# eu-elflint -d $FILE
==5053==AddressSanitizer CHECK failed: /tmp/portage/sys-devel/gcc-6.3.0/work/gcc-6.3.0/libsanitizer/sanitizer_common/sanitizer_common.cc:180 "((0 && "unable to mmap")) != (0)" (0x0, 0x0)
#0 0x7faa2335941d (/usr/lib/gcc/x86_64-pc-linux-gnu/6.3.0/libasan.so.3+0xcb41d)
#1 0x7faa2335f063 in __sanitizer::CheckFailed(char const*, int, char const*, unsigned long long, unsigned long long) (/usr/lib/gcc/x86_64-pc-linux-gnu/6.3.0/libasan.so.3+0xd1063)
#2 0x7faa2335f24d (/usr/lib/gcc/x86_64-pc-linux-gnu/6.3.0/libasan.so.3+0xd124d)
#3 0x7faa23368c52 (/usr/lib/gcc/x86_64-pc-linux-gnu/6.3.0/libasan.so.3+0xdac52)
#4 0x7faa232ba0b9 (/usr/lib/gcc/x86_64-pc-linux-gnu/6.3.0/libasan.so.3+0x2c0b9)
#5 0x7faa232b249b (/usr/lib/gcc/x86_64-pc-linux-gnu/6.3.0/libasan.so.3+0x2449b)
#6 0x7faa2335040a in calloc (/usr/lib/gcc/x86_64-pc-linux-gnu/6.3.0/libasan.so.3+0xc240a)
#7 0x431b8d in xcalloc /tmp/portage/dev-libs/elfutils-0.168/work/elfutils-0.168/lib/xmalloc.c:64
#8 0x41f0bb in check_sections /tmp/portage/dev-libs/elfutils-0.168/work/elfutils-0.168/src/elflint.c:3680
#9 0x42961f in process_elf_file /tmp/portage/dev-libs/elfutils-0.168/work/elfutils-0.168/src/elflint.c:4697
#10 0x42961f in process_file /tmp/portage/dev-libs/elfutils-0.168/work/elfutils-0.168/src/elflint.c:242
#11 0x402d33 in main /tmp/portage/dev-libs/elfutils-0.168/work/elfutils-0.168/src/elflint.c:175
#12 0x7faa21c6378f in __libc_start_main (/lib64/libc.so.6+0x2078f)
#13 0x403498 in _start (/usr/bin/eu-elflint+0x403498)
Affected version:
0.168
Fixed version:
0.169 (not released atm)
Commit fix:
https://sourceware.org/ml/elfutils-devel/2017-q1/msg00133.html
Credit:
This bug was discovered by Agostino Sarubbo of Gentoo.
CVE:
CVE-2017-7613
Reproducer:
https://github.com/asarubbo/poc/blob/master/00236-elfutils-memallocfailure
Timeline:
2017-03-27: bug discovered and reported to upstream
2017-04-04: blog post about the issue
2017-04-09: CVE assigned
Note:
This bug was found with American Fuzzy Lop.
Permalink:
https://blogs.gentoo.org/ago/2017/04/03/elfutils-memory-allocation-failure-in-xcalloc-xmalloc-c/
--
Agostino Sarubbo
Gentoo Linux Developer
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