ed0e1e4d44
1979 changes to exploits/shellcodes Couchdb 1.5.0 - 'uuids' Denial of Service Apache CouchDB 1.5.0 - 'uuids' Denial of Service Beyond Remote 2.2.5.3 - Denial of Service (PoC) udisks2 2.8.0 - Denial of Service (PoC) Termite 3.4 - Denial of Service (PoC) SoftX FTP Client 3.3 - Denial of Service (PoC) Silverstripe 2.3.5 - Cross-Site Request Forgery / Open redirection SilverStripe CMS 2.3.5 - Cross-Site Request Forgery / Open Redirection Silverstripe CMS 3.0.2 - Multiple Vulnerabilities SilverStripe CMS 3.0.2 - Multiple Vulnerabilities Silverstripe CMS 2.4 - File Renaming Security Bypass SilverStripe CMS 2.4 - File Renaming Security Bypass Silverstripe CMS 2.4.5 - Multiple Cross-Site Scripting Vulnerabilities SilverStripe CMS 2.4.5 - Multiple Cross-Site Scripting Vulnerabilities Silverstripe CMS 2.4.7 - 'install.php' PHP Code Injection SilverStripe CMS 2.4.7 - 'install.php' PHP Code Injection Silverstripe Pixlr Image Editor - 'upload.php' Arbitrary File Upload SilverStripe CMS Pixlr Image Editor - 'upload.php' Arbitrary File Upload Silverstripe CMS 2.4.x - 'BackURL' Open Redirection SilverStripe CMS 2.4.x - 'BackURL' Open Redirection Silverstripe CMS - 'MemberLoginForm.php' Information Disclosure SilverStripe CMS - 'MemberLoginForm.php' Information Disclosure Silverstripe CMS - Multiple HTML Injection Vulnerabilities SilverStripe CMS - Multiple HTML Injection Vulnerabilities Apache CouchDB 1.7.0 and 2.x before 2.1.1 - Remote Privilege Escalation Apache CouchDB 1.7.0 / 2.x < 2.1.1 - Remote Privilege Escalation Monstra CMS before 3.0.4 - Cross-Site Scripting Monstra CMS < 3.0.4 - Cross-Site Scripting (2) Monstra CMS < 3.0.4 - Cross-Site Scripting Monstra CMS < 3.0.4 - Cross-Site Scripting (1) Navigate CMS 2.8 - Cross-Site Scripting Collectric CMU 1.0 - 'lang' SQL injection Joomla! Component CW Article Attachments 1.0.6 - 'id' SQL Injection LG SuperSign EZ CMS 2.5 - Remote Code Execution MyBB Visual Editor 1.8.18 - Cross-Site Scripting Joomla! Component AMGallery 1.2.3 - 'filter_category_id' SQL Injection Joomla! Component Micro Deal Factory 2.4.0 - 'id' SQL Injection RICOH Aficio MP 301 Printer - Cross-Site Scripting Joomla! Component Auction Factory 4.5.5 - 'filter_order' SQL Injection RICOH MP C6003 Printer - Cross-Site Scripting Linux/ARM - Egghunter (PWN!) + execve(_/bin/sh__ NULL_ NULL) Shellcode (28 Bytes) Linux/ARM - sigaction() Based Egghunter (PWN!) + execve(_/bin/sh__ NULL_ NULL) Shellcode (52 Bytes)
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2.7 KiB
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67 lines
No EOL
2.7 KiB
Text
Source: https://code.google.com/p/google-security-research/issues/detail?id=664
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There is an overflow in the ui::PlatformCursor WebCursor::GetPlatformCursor method. In src/content/common/cursors/webcursor_aurax11.cc&q=webcursor_aurax11.cc, there is the following code:
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bitmap.allocN32Pixels(custom_size_.width(), custom_size_.height());
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memcpy(bitmap.getAddr32(0, 0), custom_data_.data(), custom_data_.size());
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The bitmap buffer is allocated based on the width and height of the custom_size_, but the memcpy is performed using the size of the custom_data_.
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These values are set during WebCursor deserialization in src/content/common/cursors/webcursor.cc in WebCursor::Deserialize.
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custom_size_ is set from two integers that a deserialized from a message and can be between 0 and 1024. custom_data_ is set from a vector that is deserialized, and can be any size, unrelated to the width and height. The custom_data_ is verified not to be smaller than the expected pixel buffer based on the width and height, but can be longer.
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GetPlatformCursor is called indirectly by RenderWidgetHostImpl::OnSetCursor, which is called in response to a ViewHostMsg_SetCursor message from the renderer.
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The issue above is in the x11 implementation, but it appears also affect other platform-specific implementations other than the Windows one, which instead reads out of bounds.
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I recommend this issue be fixed by changing the check in WebCursor::Deserialize:
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if (size_x * size_y * 4 > data_len)
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return false;
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to
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if (size_x * size_y * 4 != data_len)
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return false;
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to prevent the issue in all platform-specific implementations.
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To reproduce the issue replace WebCursor::Serialize with:
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bool WebCursor::Serialize(base::Pickle* pickle) const {
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if(type_ == WebCursorInfo::TypeCustom){
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LOG(WARNING) << "IN SERIALIZE\n";
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if (!pickle->WriteInt(type_) ||
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!pickle->WriteInt(hotspot_.x()) ||
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!pickle->WriteInt(hotspot_.y()) ||
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!pickle->WriteInt(2) ||
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!pickle->WriteInt(1) ||
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!pickle->WriteFloat(custom_scale_))
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return false;
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}else{
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if (!pickle->WriteInt(type_) ||
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!pickle->WriteInt(hotspot_.x()) ||
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!pickle->WriteInt(hotspot_.y()) ||
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!pickle->WriteInt(custom_size_.width()) ||
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!pickle->WriteInt(custom_size_.height()) ||
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!pickle->WriteFloat(custom_scale_))
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return false;
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}
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const char* data = NULL;
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if (!custom_data_.empty())
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data = &custom_data_[0];
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if (!pickle->WriteData(data, custom_data_.size()))
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return false;
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return SerializePlatformData(pickle);
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}
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and visit the attached html page, with the attached image in the same directory.
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Proof of Concept:
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https://github.com/offensive-security/exploitdb-bin-sploits/raw/master/bin-sploits/39039.zip |