Hi, just tested on Debian unstable (Wget 1.21.3), no issue found.
I suggest you report this against Ubuntu. They have a security team that either applies a patch to Wget 1.17 or take a newer version of Wget. They also might check and/or assign a CVE as it helps them and other distros to keep track of such an issue. Here on Upstream this issues seems to be fixed. Regards, Tim On 10/15/19 12:07 PM, A.K. Zidani wrote: > Hi Tim, > > I could try that as well but this is the version that ships with Ubuntu on > Windows 10. > bear in mind this is not a wget for Windows, it's a native linux binary. > see this for more info: https://itsfoss.com/install-bash-on-windows/ > > I've submitted a security bug to that mailing list. > Please let me know if I can assist you further with testing this on newer > versions. > > > > > > > On Tue, 15 Oct 2019 at 12:00, Tim Rühsen <[email protected]> wrote: > >> Hi, >> >> thanks for the report. Is that still an issue on a recent version of >> Wget ? The version 1.17.1 you are using is very outdated. >> >> We don't directly support windows binaries, but here is an unofficial >> website that provides for binary downloads: >> >> https://eternallybored.org/misc/wget/ >> >> If you find possible security issues, please do not make them public by >> writing to this mailing list. Instead open an issue at >> https://savannah.gnu.org/bugs/?func=additem&group=wget >> and set 'Privacy' to 'private'. >> >> Regards, Tim >> >> On 10/14/19 8:15 PM, A.K. Zidani wrote: >>> Hello there, >>> >>> I'm a security researcher and I think I found something interesting when >>> using wget to download a file under Windows's BASH environment. >>> >>> here is a quick poc I created: >>> https://addaxsoft.com/poc/AAAAAAAAA%bb%e4%b8%ad%e7AAAAAAAAAAAAAAAA >>> when you wget that file; wget will crash at: >>> >>> Program received signal SIGSEGV, Segmentation fault. >>> __memset_avx2 () at ../sysdeps/x86_64/multiarch/memset-avx2.S:161 >>> >>> 0x00007ffffe202ae6 <+374>: sub rax,rdx >>> 0x00007ffffe202ae9 <+377>: vzeroupper >>> 0x00007ffffe202aec <+380>: ret >>> 0x00007ffffe202aed <+381>: nop DWORD PTR [rax] >>> 0x00007ffffe202af0 <+384>: sub rcx,0xffffffffffffff80 >>> 0x00007ffffe202af4 <+388>: vmovd eax,xmm0 >>> => 0x00007ffffe202af8 <+392>: rep stos BYTE PTR es:[rdi],al >>> 0x00007ffffe202afa <+394>: mov rax,rsi >>> 0x00007ffffe202afd <+397>: sub rax,rdx >>> 0x00007ffffe202b00 <+400>: vzeroupper >>> 0x00007ffffe202b03 <+403>: ret >>> >>> registers: >>> (gdb) info registers >>> rax 0x20202020 538976288 >>> rbx 0xffffffffffffffff -1 >>> rcx 0xffffffffffff5387 -44153 >>> rdx 0xffffffffffffffff -1 >>> rsi 0x84b1387 139137927 >>> rdi 0x84bc000 139182080 >>> rbp 0x84b1140 0x84b1140 >>> rsp 0x7ffffffed558 0x7ffffffed558 >>> r8 0x0 0 >>> r9 0x1 1 >>> r10 0x7ffffffed4a8 140737488278696 >>> r11 0x8279880 136812672 >>> r12 0x7 7 >>> r13 0x7 7 >>> r14 0x82798f0 136812784 >>> r15 0x84b1388 139137928 >>> rip 0x7ffffe202af8 0x7ffffe202af8 <__memset_avx2+392> >>> eflags 0x10287 [ CF PF SF IF RF ] >>> cs 0x33 51 >>> ss 0x2b 43 >>> ds 0x0 0 >>> es 0x0 0 >>> fs 0x0 0 >>> gs 0x0 0 >>> >>> rdi is accessing inaccessible memory which the cause of the crash: >>> (gdb) x $rdi >>> 0x84bc000: Cannot access memory at address 0x84bc000 >>> >>> here is my wget -V output: >>> root@PC:~# wget -V >>> GNU Wget 1.17.1 built on linux-gnu. >>> >>> +digest -gpgme +https +ipv6 +iri +large-file -metalink +nls +ntlm >>> +opie -psl +ssl/openssl >>> >>> Wgetrc: >>> /etc/wgetrc (system) >>> Locale: >>> /usr/share/locale >>> Compile: >>> gcc -DHAVE_CONFIG_H -DSYSTEM_WGETRC="/etc/wgetrc" >>> -DLOCALEDIR="/usr/share/locale" -I. -I../../src -I../lib >>> -I../../lib -Wdate-time -D_FORTIFY_SOURCE=2 -I/usr/include >>> -DHAVE_LIBSSL -DNDEBUG -g -O2 -fPIE -fstack-protector-strong >>> -Wformat -Werror=format-security -DNO_SSLv2 -D_FILE_OFFSET_BITS=64 >>> -g -Wall >>> Link: >>> gcc -DHAVE_LIBSSL -DNDEBUG -g -O2 -fPIE -fstack-protector-strong >>> -Wformat -Werror=format-security -DNO_SSLv2 -D_FILE_OFFSET_BITS=64 >>> -g -Wall -Wl,-Bsymbolic-functions -fPIE -pie -Wl,-z,relro >>> -Wl,-z,now -L/usr/lib -lpcre -luuid -lssl -lcrypto -lz -lidn >>> ftp-opie.o openssl.o http-ntlm.o ../lib/libgnu.a >>> >>> Copyright (C) 2015 Free Software Foundation, Inc. >>> Licence GPLv3+: GNU GPL version 3 or later >>> <http://www.gnu.org/licenses/gpl.html>. >>> This is free software: you are free to change and redistribute it. >>> There is NO WARRANTY, to the extent permitted by law. >>> >>> Originally written by Hrvoje Niksic <[email protected]>. >>> Please send bug reports and questions to <[email protected]>. >>> >>> >>> >>> >>> >>> I didn't look into this further, but potentially I can have a memory >> write >>> if I get control of rdi and rax at some point in the code path, which may >>> lead to code execution as well. >>> >>> NOTE: this only crashes wget running in bash in a Windows environment. >>> not sure if this is the same as CVE-2019-5953, but I would like to >>> investigate further. >>> >>> >>> >>> >> >> >
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