SAP Patches Internet Graphics Server Flaws

SAP this week released its May 2018 set of security patches to address more than a dozen vulnerabilities across its product portfolio, including four bugs in Internet Graphics Server.

The company released 9 new Security Notes as part of the SAP Security Patch Day, to which Support Package Notes and updates to previously released notes are added, for a total of 16 notes released since the previous Patch Day (the second Tuesday of the previous month).

Most of the security bugs addressed this month were rated Medium severity, with just one assessed with a Low severity rating.

Missing authorization checks and Denial of service issues were the most commonly encountered vulnerabilities, but SAP also addressed Cross-Site Scripting, code injection, information disclosure, open redirect, XML external entity, implementation flaw, and spoofing bugs.

SAP Internet Graphics Server (IGS), the engine used by SAP for generating visual components like graphics or charts, was the most affected product this month, accounting for four of the Security Notes.

The vulnerabilities addressed in it include CVE-2018-2420 – Unrestricted File Upload (allowing an attacker to upload any file (including script files) without proper file format validation), CVE-2018-2421 and CVE-2018-2422 – Denial of Service, and CVE-2018-2423 – Denial of Service in IGS HTTP and RFC listener.

By exploiting CVE-2018-2420, an attacker could “gain access to user’s session and learn business-critical information, in some cases it is possible to get control over this information. In addition, XSS can be used for unauthorized modifying of displayed site content,” ERPScan reveals.

CVE-2018-2420 and CVE-2018-2421 are addressed in security notes #2615635 and #2616599, both expected to be discussed at an upcoming security conference in June.

SAP has addressed numerous vulnerabilities in IGS over the past months, including Denial of Service, Cross-Site Scripting (XSS), and Log Injection attacks, amongst others, Onapsis points out.

Two notes released in February (#2525222) and March (#2538829) addressed together more than 15 vulnerabilities, some very severe.

Another important vulnerability addressed this month is CVE-2018-2418, a Code Injection in SAP MaxDB ODBC Driver. The flaw allows an attacker to inject and run their own code, obtain additional sensitive information, modify or delete data, change the output of the system, create new users, control the behavior of the system, or escalate privileges and perform a DoS attack.

This month, SAP also re-released security note #2190621 (initially published two and a half years ago) with updated CVSS, prerequisite and solution information related to incorrect logging of IP addresses in the Security Audit Logging (SAL) function.

In some environments where the SAP system is behind a proxy or a NAT, the original client IP address is logged instead of the NAT-translated IP address. Not only can client IP addresses be easily manipulated, but the upcoming General Data Protection Regulation (GDPR) could consider client IP addresses as personal data, Onapsis notes.

A couple of weeks ago, Onapsis revealed that 9 out of 10 SAP systems were found to be vulnerable to a SAP Netweaver bug that was first identified in 2005. The vulnerability provides an attacker with unrestricted access to the system, allowing them to read information, extract data, or shut the system down.

“The threat still exists within the default security settings of every Netweaver based SAP product such as SAP ERP, SAP CRM, S/4 HANA, SAP GRC Process and Access Control, SAP Process Integration/Exchange Infrastructure (PI/XI), SAP Solution Manager, SAP SCM, SAP SRM and others,” the firm explains.

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