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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2.5 KiB
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65 lines
No EOL
2.5 KiB
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Related to issue 1490 .
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When parsing ShadingPatterns; according to the specification they shouldn't be permitted to have a pattern colorspace as their base colorspace, but this is not validated, leading to out-of-bounds reads when rendering using the malformed shading pattern.
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bool CPDF_ShadingPattern::Load() {
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// ... snip ...
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CPDF_Object* pCSObj = pShadingDict->GetDirectObjectFor("ColorSpace");
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if (!pCSObj)
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return false;
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// No validation here on the type of colorspace.
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// ... snip ...
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return true;
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}
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If we now look at the code called during rendering of this pattern, we call through DrawFreeGouraudShading (cpdf_renderstatus.cpp), which will call CPDF_MeshStream::ReadVertex for each vertex in the shading pattern, which will call CPDF_MeshStream::ReadColor.
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std::tuple<float, float, float> CPDF_MeshStream::ReadColor() {
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ASSERT(ShouldCheckBPC(m_type));
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float color_value[kMaxComponents];
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for (uint32_t i = 0; i < m_nComponents; ++i) {
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color_value[i] = m_ColorMin[i] + m_BitStream->GetBits(m_nComponentBits) *
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(m_ColorMax[i] - m_ColorMin[i]) /
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m_ComponentMax;
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}
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// NB: color_value has only been initialised for the first m_nComponents elements
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float r = 0.0;
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float g = 0.0;
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float b = 0.0;
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if (m_funcs.empty()) {
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m_pCS->GetRGB(color_value, &r, &g, &b); // <-- we're interested in this call here
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return std::tuple<float, float, float>(r, g, b);
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}
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// ... snip ...
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}
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This call to GetRGB will be into the pattern cs
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bool CPDF_PatternCS::GetRGB(float* pBuf, float* R, float* G, float* B) const {
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if (m_pBaseCS) {
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ASSERT(m_pBaseCS->GetFamily() != PDFCS_PATTERN);
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PatternValue* pvalue = (PatternValue*)pBuf;
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// pvalue->m_Comps is now pointing 5 dwords into an 8 dword sized buffer, and p_pBaseCS expects to be able to read 8 dwords from it.
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if (m_pBaseCS->GetRGB(pvalue->m_Comps, R, G, B))
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return true;
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}
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*R = 0.75f;
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*G = 0.75f;
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*B = 0.75f;
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return false;
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}
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Originally reported without 90 day deadline as https://bugs.chromium.org/p/chromium/issues/detail?id=795251, since it wasn't clear that there was an easy way to use the oob-read to leak information in a way that was useful, deadline applied as of 15/12 after working out how to use this as an information leak for issue 1489 .
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Proof of Concept:
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https://github.com/offensive-security/exploitdb-bin-sploits/raw/master/bin-sploits/44083.zip |