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p7zip: Fix CVE-2017-17969
[No upstream tracking] -- https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=888297
Heap-based buffer overflow in 7zip
Compress/ShrinkDecoder.cpp: Heap-based buffer overflow
in the NCompress::NShrink::CDecoder::CodeReal method
in 7-Zip before 18.00 and p7zip allows remote attackers
to cause a denial of service (out-of-bounds write)
or potentially execute arbitrary code via a crafted ZIP archive.
Upstream-Status: Backport [https://sourceforge.net/p/p7zip/bugs/_discuss/thread/0920f369/8316/attachment/CVE-2017-17969.patch]
CVE: CVE-2017-17969
Signed-off-by: Radovan Scasny <radovan.scasny@siemens.com>
--- a/CPP/7zip/Compress/ShrinkDecoder.cpp
+++ b/CPP/7zip/Compress/ShrinkDecoder.cpp
@@ -121,7 +121,12 @@ HRESULT CDecoder::CodeReal(ISequentialInStream *inStream, ISequentialOutStream *
{
_stack[i++] = _suffixes[cur];
cur = _parents[cur];
+ if (cur >= kNumItems || i >= kNumItems)
+ break;
}
+
+ if (cur >= kNumItems || i >= kNumItems)
+ break;
_stack[i++] = (Byte)cur;
lastChar2 = (Byte)cur;
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