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Message-ID: <293903.679211752-sendEmail@localhost>
Date: Mon, 1 May 2017 11:30:37 +0000
From: "Agostino Sarubbo" <ago@...too.org>
To: "oss-security@...ts.openwall.com" <oss-security@...ts.openwall.com>
Subject: ettercap: etterfilter: heap-based buffer overflow write
Description:
ettercap is a comprehensive suite for man in the middle attacks.
There is an heap overflow write in etterfilter if it parses a malformed filter.
The complete ASan output:
# etterfilter $FILE
etterfilter 0.8.2 copyright 2001-2015 Ettercap Development Team
14 protocol tables loaded:
DECODED DATA udp tcp esp gre icmp ipv6 ip arp wifi fddi tr eth
13 constants loaded:
VRRP OSPF GRE UDP TCP ESP ICMP6 ICMP PPTP PPPOE IP6 IP ARP
=================================================================
==3961==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x61d00000a8da at pc 0x7fb38ebea5b8 bp 0x7fff8bc36cc0 sp 0x7fff8bc36cb8
WRITE of size 1 at 0x61d00000a8da thread T0
#0 0x7fb38ebea5b7 in strescape /tmp/portage/net-analyzer/ettercap-9999/work/ettercap-9999/src/ec_strings.c:182:23
#1 0x51342c in encode_const /tmp/portage/net-analyzer/ettercap-9999/work/ettercap-9999/utils/etterfilter/ef_encode.c:134:27
#2 0x538e70 in yylex /tmp/portage/net-analyzer/ettercap-9999/work/ettercap-9999_build/utils/etterfilter/ef_syntax.l:173:8
#3 0x53fe67 in yyparse /tmp/portage/net-analyzer/ettercap-9999/work/ettercap-9999_build/utils/ef_grammar.c:1223:16
#4 0x51fadf in main /tmp/portage/net-analyzer/ettercap-9999/work/ettercap-9999/utils/etterfilter/ef_main.c:81:8
#5 0x7fb38d81178f in __libc_start_main /tmp/portage/sys-libs/glibc-2.23-r3/work/glibc-2.23/csu/../csu/libc-start.c:289
#6 0x41abf8 in _start (/usr/bin/etterfilter+0x41abf8)
AddressSanitizer can not describe address in more detail (wild memory access suspected).
SUMMARY: AddressSanitizer: heap-buffer-overflow /tmp/portage/net-analyzer/ettercap-9999/work/ettercap-9999/src/ec_strings.c:182:23 in strescape
Shadow bytes around the buggy address:
0x0c3a7fff94c0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c3a7fff94d0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c3a7fff94e0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c3a7fff94f0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c3a7fff9500: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
=>0x0c3a7fff9510: fa fa fa fa fa fa fa fa fa fa fa[fa]fa fa fa fa
0x0c3a7fff9520: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c3a7fff9530: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c3a7fff9540: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c3a7fff9550: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0c3a7fff9560: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
Shadow byte legend (one shadow byte represents 8 application bytes):
Addressable: 00
Partially addressable: 01 02 03 04 05 06 07
Heap left redzone: fa
Heap right redzone: fb
Freed heap region: fd
Stack left redzone: f1
Stack mid redzone: f2
Stack right redzone: f3
Stack partial redzone: f4
Stack after return: f5
Stack use after scope: f8
Global redzone: f9
Global init order: f6
Poisoned by user: f7
Container overflow: fc
Array cookie: ac
Intra object redzone: bb
ASan internal: fe
Left alloca redzone: ca
Right alloca redzone: cb
==3961==ABORTING
Affected version:
0.8.2
Fixed version:
N/A
Commit fix:
N/A
Credit:
This bug was discovered by Agostino Sarubbo of Gentoo.
CVE:
CVE-2017-8366
Reproducer:
https://github.com/asarubbo/poc/blob/master/00224-ettercap-heapoverflow-strescape
Timeline:
2017-03-21: bug discovered and reported to upstream
2017-04-29: blog post about the issue
2017-04-30: CVE assigned
Note:
This bug was found with American Fuzzy Lop.
Permalink:
https://blogs.gentoo.org/ago/2017/04/29/ettercap-etterfilter-heap-based-buffer-overflow-write/
--
Agostino Sarubbo
Gentoo Linux Developer
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