1*b95905d1SWilliam A. Kennington IIIFrom 7f2da4f810b429ddb7afa0e252e3d02ced0eba87 Mon Sep 17 00:00:00 2001 2*b95905d1SWilliam A. Kennington IIIFrom: Radovan Scasny <radovan.scasny@siemens.com> 3*b95905d1SWilliam A. Kennington IIIDate: Tue, 20 Feb 2018 12:08:13 +0100 4*b95905d1SWilliam A. Kennington IIISubject: [PATCH] p7zip: Fix CVE-2017-17969 5eb8dc403SDave Cobbley 6eb8dc403SDave Cobbley[No upstream tracking] -- https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=888297 7eb8dc403SDave Cobbley 8eb8dc403SDave CobbleyHeap-based buffer overflow in 7zip 9eb8dc403SDave Cobbley 10eb8dc403SDave CobbleyCompress/ShrinkDecoder.cpp: Heap-based buffer overflow 11eb8dc403SDave Cobbleyin the NCompress::NShrink::CDecoder::CodeReal method 12eb8dc403SDave Cobbleyin 7-Zip before 18.00 and p7zip allows remote attackers 13eb8dc403SDave Cobbleyto cause a denial of service (out-of-bounds write) 14eb8dc403SDave Cobbleyor potentially execute arbitrary code via a crafted ZIP archive. 15eb8dc403SDave Cobbley 16eb8dc403SDave CobbleyUpstream-Status: Backport [https://sourceforge.net/p/p7zip/bugs/_discuss/thread/0920f369/8316/attachment/CVE-2017-17969.patch] 17eb8dc403SDave CobbleyCVE: CVE-2017-17969 18eb8dc403SDave CobbleySigned-off-by: Radovan Scasny <radovan.scasny@siemens.com> 19eb8dc403SDave Cobbley 20*b95905d1SWilliam A. Kennington III--- 21*b95905d1SWilliam A. Kennington III CPP/7zip/Compress/ShrinkDecoder.cpp | 5 +++++ 22*b95905d1SWilliam A. Kennington III 1 file changed, 5 insertions(+) 23*b95905d1SWilliam A. Kennington III 24*b95905d1SWilliam A. Kennington IIIdiff --git a/CPP/7zip/Compress/ShrinkDecoder.cpp b/CPP/7zip/Compress/ShrinkDecoder.cpp 25*b95905d1SWilliam A. Kennington IIIindex 80b7e67..5bb0559 100644 26eb8dc403SDave Cobbley--- a/CPP/7zip/Compress/ShrinkDecoder.cpp 27eb8dc403SDave Cobbley+++ b/CPP/7zip/Compress/ShrinkDecoder.cpp 28eb8dc403SDave Cobbley@@ -121,7 +121,12 @@ HRESULT CDecoder::CodeReal(ISequentialInStream *inStream, ISequentialOutStream * 29eb8dc403SDave Cobbley { 30eb8dc403SDave Cobbley _stack[i++] = _suffixes[cur]; 31eb8dc403SDave Cobbley cur = _parents[cur]; 32eb8dc403SDave Cobbley+ if (cur >= kNumItems || i >= kNumItems) 33eb8dc403SDave Cobbley+ break; 34eb8dc403SDave Cobbley } 35eb8dc403SDave Cobbley+ 36eb8dc403SDave Cobbley+ if (cur >= kNumItems || i >= kNumItems) 37eb8dc403SDave Cobbley+ break; 38eb8dc403SDave Cobbley 39eb8dc403SDave Cobbley _stack[i++] = (Byte)cur; 40eb8dc403SDave Cobbley lastChar2 = (Byte)cur; 41