diff options
Diffstat (limited to 'app-arch/p7zip/files/p7zip-9.20.1-CVE-2015-1038.patch')
| -rw-r--r-- | app-arch/p7zip/files/p7zip-9.20.1-CVE-2015-1038.patch | 315 |
1 files changed, 0 insertions, 315 deletions
diff --git a/app-arch/p7zip/files/p7zip-9.20.1-CVE-2015-1038.patch b/app-arch/p7zip/files/p7zip-9.20.1-CVE-2015-1038.patch deleted file mode 100644 index 619ff2dda83b..000000000000 --- a/app-arch/p7zip/files/p7zip-9.20.1-CVE-2015-1038.patch +++ /dev/null @@ -1,315 +0,0 @@ -Author: Ben Hutchings <ben@decadent.org.uk> -Date: Tue, 19 May 2015 02:38:40 +0100 -Description: Delay creation of symlinks to prevent arbitrary file writes (CVE-2015-1038) -Bug: https://sourceforge.net/p/p7zip/bugs/147/ -Bug-Debian: https://bugs.debian.org/774660 - -Alexander Cherepanov discovered that 7zip is susceptible to a -directory traversal vulnerability. While extracting an archive, it -will extract symlinks and then follow them if they are referenced in -further entries. This can be exploited by a rogue archive to write -files outside the current directory. - -We have to create placeholder files (which we already do) and delay -creating symlinks until the end of extraction. - -Due to the possibility of anti-items (deletions) in the archive, it is -possible for placeholders to be deleted and replaced before we create -the symlinks. It's not clear that this can be used for mischief, but -GNU tar guards against similar problems by checking that the placeholder -still exists and is the same inode. XXX It also checks 'birth time' but -this isn't portable. We can probably get away with comparing ctime -since we don't support hard links. - ---- a/CPP/7zip/UI/Agent/Agent.cpp -+++ b/CPP/7zip/UI/Agent/Agent.cpp -@@ -424,6 +424,8 @@ STDMETHODIMP CAgentFolder::Extract(const - CMyComPtr<IArchiveExtractCallback> extractCallback = extractCallbackSpec; - UStringVector pathParts; - CProxyFolder *currentProxyFolder = _proxyFolderItem; -+ HRESULT res; -+ - while (currentProxyFolder->Parent) - { - pathParts.Insert(0, currentProxyFolder->Name); -@@ -445,8 +447,11 @@ STDMETHODIMP CAgentFolder::Extract(const - (UInt64)(Int64)-1); - CUIntVector realIndices; - GetRealIndices(indices, numItems, realIndices); -- return _agentSpec->GetArchive()->Extract(&realIndices.Front(), -+ res = _agentSpec->GetArchive()->Extract(&realIndices.Front(), - realIndices.Size(), testMode, extractCallback); -+ if (res == S_OK && !extractCallbackSpec->CreateSymLinks()) -+ res = E_FAIL; -+ return res; - COM_TRY_END - } - ---- a/CPP/7zip/UI/Agent/ArchiveFolder.cpp -+++ b/CPP/7zip/UI/Agent/ArchiveFolder.cpp -@@ -20,6 +20,8 @@ STDMETHODIMP CAgentFolder::CopyTo(const - CMyComPtr<IArchiveExtractCallback> extractCallback = extractCallbackSpec; - UStringVector pathParts; - CProxyFolder *currentProxyFolder = _proxyFolderItem; -+ HRESULT res; -+ - while (currentProxyFolder->Parent) - { - pathParts.Insert(0, currentProxyFolder->Name); -@@ -46,8 +48,11 @@ STDMETHODIMP CAgentFolder::CopyTo(const - (UInt64)(Int64)-1); - CUIntVector realIndices; - GetRealIndices(indices, numItems, realIndices); -- return _agentSpec->GetArchive()->Extract(&realIndices.Front(), -+ res = _agentSpec->GetArchive()->Extract(&realIndices.Front(), - realIndices.Size(), BoolToInt(false), extractCallback); -+ if (res == S_OK && !extractCallbackSpec->CreateSymLinks()) -+ res = E_FAIL; -+ return res; - COM_TRY_END - } - ---- a/CPP/7zip/UI/Client7z/Client7z.cpp -+++ b/CPP/7zip/UI/Client7z/Client7z.cpp -@@ -197,8 +197,11 @@ private: - COutFileStream *_outFileStreamSpec; - CMyComPtr<ISequentialOutStream> _outFileStream; - -+ CObjectVector<NWindows::NFile::NDirectory::CDelayedSymLink> _delayedSymLinks; -+ - public: - void Init(IInArchive *archiveHandler, const UString &directoryPath); -+ bool CreateSymLinks(); - - UInt64 NumErrors; - bool PasswordIsDefined; -@@ -392,11 +395,22 @@ STDMETHODIMP CArchiveExtractCallback::Se - } - _outFileStream.Release(); - if (_extractMode && _processedFileInfo.AttribDefined) -- NFile::NDirectory::MySetFileAttributes(_diskFilePath, _processedFileInfo.Attrib); -+ NFile::NDirectory::MySetFileAttributes(_diskFilePath, _processedFileInfo.Attrib, &_delayedSymLinks); - PrintNewLine(); - return S_OK; - } - -+bool CArchiveExtractCallback::CreateSymLinks() -+{ -+ bool success = true; -+ -+ for (int i = 0; i != _delayedSymLinks.Size(); ++i) -+ success &= _delayedSymLinks[i].Create(); -+ -+ _delayedSymLinks.Clear(); -+ -+ return success; -+} - - STDMETHODIMP CArchiveExtractCallback::CryptoGetTextPassword(BSTR *password) - { ---- a/CPP/7zip/UI/Common/ArchiveExtractCallback.cpp -+++ b/CPP/7zip/UI/Common/ArchiveExtractCallback.cpp -@@ -453,12 +453,24 @@ STDMETHODIMP CArchiveExtractCallback::Se - NumFiles++; - - if (_extractMode && _fi.AttribDefined) -- NFile::NDirectory::MySetFileAttributes(_diskFilePath, _fi.Attrib); -+ NFile::NDirectory::MySetFileAttributes(_diskFilePath, _fi.Attrib, &_delayedSymLinks); - RINOK(_extractCallback2->SetOperationResult(operationResult, _encrypted)); - return S_OK; - COM_TRY_END - } - -+bool CArchiveExtractCallback::CreateSymLinks() -+{ -+ bool success = true; -+ -+ for (int i = 0; i != _delayedSymLinks.Size(); ++i) -+ success &= _delayedSymLinks[i].Create(); -+ -+ _delayedSymLinks.Clear(); -+ -+ return success; -+} -+ - /* - STDMETHODIMP CArchiveExtractCallback::GetInStream( - const wchar_t *name, ISequentialInStream **inStream) ---- a/CPP/7zip/UI/Common/ArchiveExtractCallback.h -+++ b/CPP/7zip/UI/Common/ArchiveExtractCallback.h -@@ -6,6 +6,8 @@ - #include "Common/MyCom.h" - #include "Common/Wildcard.h" - -+#include "Windows/FileDir.h" -+ - #include "../../IPassword.h" - - #include "../../Common/FileStreams.h" -@@ -83,6 +85,8 @@ class CArchiveExtractCallback: - UInt64 _packTotal; - UInt64 _unpTotal; - -+ CObjectVector<NWindows::NFile::NDirectory::CDelayedSymLink> _delayedSymLinks; -+ - void CreateComplexDirectory(const UStringVector &dirPathParts, UString &fullPath); - HRESULT GetTime(int index, PROPID propID, FILETIME &filetime, bool &filetimeIsDefined); - HRESULT GetUnpackSize(); -@@ -138,6 +142,7 @@ public: - const UStringVector &removePathParts, - UInt64 packSize); - -+ bool CreateSymLinks(); - }; - - #endif ---- a/CPP/7zip/UI/Common/Extract.cpp -+++ b/CPP/7zip/UI/Common/Extract.cpp -@@ -96,6 +96,9 @@ static HRESULT DecompressArchive( - else - result = archive->Extract(&realIndices.Front(), realIndices.Size(), testMode, extractCallbackSpec); - -+ if (result == S_OK && !extractCallbackSpec->CreateSymLinks()) -+ result = E_FAIL; -+ - return callback->ExtractResult(result); - } - ---- a/CPP/Windows/FileDir.cpp -+++ b/CPP/Windows/FileDir.cpp -@@ -453,9 +453,10 @@ bool SetDirTime(LPCWSTR fileName, const - } - - #ifndef _UNICODE --bool MySetFileAttributes(LPCWSTR fileName, DWORD fileAttributes) -+bool MySetFileAttributes(LPCWSTR fileName, DWORD fileAttributes, -+ CObjectVector<CDelayedSymLink> *delayedSymLinks) - { -- return MySetFileAttributes(UnicodeStringToMultiByte(fileName, CP_ACP), fileAttributes); -+ return MySetFileAttributes(UnicodeStringToMultiByte(fileName, CP_ACP), fileAttributes, delayedSymLinks); - } - - bool MyRemoveDirectory(LPCWSTR pathName) -@@ -488,7 +489,8 @@ static int convert_to_symlink(const char - return -1; - } - --bool MySetFileAttributes(LPCTSTR fileName, DWORD fileAttributes) -+bool MySetFileAttributes(LPCTSTR fileName, DWORD fileAttributes, -+ CObjectVector<CDelayedSymLink> *delayedSymLinks) - { - if (!fileName) { - SetLastError(ERROR_PATH_NOT_FOUND); -@@ -520,7 +522,9 @@ bool MySetFileAttributes(LPCTSTR fileNam - stat_info.st_mode = fileAttributes >> 16; - #ifdef ENV_HAVE_LSTAT - if (S_ISLNK(stat_info.st_mode)) { -- if ( convert_to_symlink(name) != 0) { -+ if (delayedSymLinks) -+ delayedSymLinks->Add(CDelayedSymLink(name)); -+ else if ( convert_to_symlink(name) != 0) { - TRACEN((printf("MySetFileAttributes(%s,%d) : false-3\n",name,fileAttributes))) - return false; - } -@@ -924,4 +928,41 @@ bool CTempDirectory::Create(LPCTSTR pref - } - - -+#ifdef ENV_UNIX -+ -+CDelayedSymLink::CDelayedSymLink(LPCSTR source) -+ : _source(source) -+{ -+ struct stat st; -+ -+ if (lstat(_source, &st) == 0) { -+ _dev = st.st_dev; -+ _ino = st.st_ino; -+ } else { -+ _dev = 0; -+ } -+} -+ -+bool CDelayedSymLink::Create() -+{ -+ struct stat st; -+ -+ if (_dev == 0) { -+ errno = EPERM; -+ return false; -+ } -+ if (lstat(_source, &st) != 0) -+ return false; -+ if (_dev != st.st_dev || _ino != st.st_ino) { -+ // Placeholder file has been overwritten or moved by another -+ // symbolic link creation -+ errno = EPERM; -+ return false; -+ } -+ -+ return convert_to_symlink(_source) == 0; -+} -+ -+#endif // ENV_UNIX -+ - }}} ---- a/CPP/Windows/FileDir.h -+++ b/CPP/Windows/FileDir.h -@@ -4,6 +4,7 @@ - #define __WINDOWS_FILEDIR_H - - #include "../Common/MyString.h" -+#include "../Common/MyVector.h" - #include "Defs.h" - - /* GetFullPathName for 7zAES.cpp */ -@@ -13,11 +14,15 @@ namespace NWindows { - namespace NFile { - namespace NDirectory { - -+class CDelayedSymLink; -+ - bool SetDirTime(LPCWSTR fileName, const FILETIME *creationTime, const FILETIME *lastAccessTime, const FILETIME *lastWriteTime); - --bool MySetFileAttributes(LPCTSTR fileName, DWORD fileAttributes); -+bool MySetFileAttributes(LPCTSTR fileName, DWORD fileAttributes, -+ CObjectVector<CDelayedSymLink> *delayedSymLinks = 0); - #ifndef _UNICODE --bool MySetFileAttributes(LPCWSTR fileName, DWORD fileAttributes); -+bool MySetFileAttributes(LPCWSTR fileName, DWORD fileAttributes, -+ CObjectVector<CDelayedSymLink> *delayedSymLinks = 0); - #endif - - bool MyMoveFile(LPCTSTR existFileName, LPCTSTR newFileName); -@@ -80,6 +85,31 @@ public: - bool Remove(); - }; - -+// Symbolic links must be created last so that they can't be used to -+// create or overwrite files above the extraction directory. -+class CDelayedSymLink -+{ -+#ifdef ENV_UNIX -+ // Where the symlink should be created. The target is specified in -+ // the placeholder file. -+ AString _source; -+ -+ // Device and inode of the placeholder file. Before creating the -+ // symlink, we must check that these haven't been changed by creation -+ // of another symlink. -+ dev_t _dev; -+ ino_t _ino; -+ -+public: -+ explicit CDelayedSymLink(LPCSTR source); -+ bool Create(); -+#else // !ENV_UNIX -+public: -+ CDelayedSymLink(LPCSTR source) {} -+ bool Create() { return true; } -+#endif // ENV_UNIX -+}; -+ - #ifdef _UNICODE - typedef CTempFile CTempFileW; - #endif |