CVE Vulnerabilities

CVE-2019-0265

Improper Restriction of XML External Entity Reference

Published: Feb 15, 2019 | Modified: Mar 13, 2019
CVSS 3.x
4.9
MEDIUM
Source:
NVD
CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
CVSS 2.x
4 MEDIUM
AV:N/AC:L/Au:S/C:N/I:N/A:P
RedHat/V2
RedHat/V3
Ubuntu

SLD Registration of ABAP Platform allows an attacker to prevent legitimate users from accessing a service, either by crashing or flooding the service. Fixed in versions KRNL32NUC 7.21, 7.21EXT, 7.22, 7.22EXT,KRNL32UC 7.21, 7.21EXT, 7.22, 7.22EXT, KRNL64NUC 7.21, 7.21EXT, 7.22, 7.22EXT, 7.49,KRNL64UC 7.21, 7.21EXT, 7.22, 7.22EXT, 7.49. 7.73 KERNEL from 7.21 to 7.22, 7.45, 7.49, 7.53, 7.73, 7.75.

Weakness

The product processes an XML document that can contain XML entities with URIs that resolve to documents outside of the intended sphere of control, causing the product to embed incorrect documents into its output.

Affected Software

Name Vendor Start Version End Version
Advanced_business_application_programming_platform_kernel Sap 7.21 7.22
Advanced_business_application_programming_platform_kernel Sap 7.45 7.45
Advanced_business_application_programming_platform_kernel Sap 7.49 7.49
Advanced_business_application_programming_platform_kernel Sap 7.53 7.53
Advanced_business_application_programming_platform_kernel Sap 7.73 7.73
Advanced_business_application_programming_platform_kernel Sap 7.75. 7.75.
Advanced_business_application_programming_platform_krnl64uc Sap 7.21 7.21
Advanced_business_application_programming_platform_krnl64uc Sap 7.21ext 7.21ext
Advanced_business_application_programming_platform_krnl64uc Sap 7.22 7.22
Advanced_business_application_programming_platform_krnl64uc Sap 7.22ext 7.22ext
Advanced_business_application_programming_platform_krnl64uc Sap 7.49 7.49
Advanced_business_application_programming_platform_krnl64uc Sap 7.73 7.73
Advanced_business_application_programming_platform_krnl64nuc Sap 7.21 7.21
Advanced_business_application_programming_platform_krnl64nuc Sap 7.21ext 7.21ext
Advanced_business_application_programming_platform_krnl64nuc Sap 7.22 7.22
Advanced_business_application_programming_platform_krnl64nuc Sap 7.22ext 7.22ext
Advanced_business_application_programming_platform_krnl64nuc Sap 7.49 7.49
Advanced_business_application_programming_platform_krnl32uc Sap 7.21 7.21
Advanced_business_application_programming_platform_krnl32uc Sap 7.22 7.22
Advanced_business_application_programming_platform_krnl32uc Sap 7.22ext 7.22ext
Advanced_business_application_programming_platform_krnl32uc Sap 7.21ext 7.21ext
Advanced_business_application_programming_platform_krnl32nuc Sap 7.21ext 7.21ext
Advanced_business_application_programming_platform_krnl32nuc Sap 7.22 7.22
Advanced_business_application_programming_platform_krnl32nuc Sap 7.22ext 7.22ext
Advanced_business_application_programming_platform_krnl32nuc Sap 7.21 7.21

Extended Description

XML documents optionally contain a Document Type Definition (DTD), which, among other features, enables the definition of XML entities. It is possible to define an entity by providing a substitution string in the form of a URI. The XML parser can access the contents of this URI and embed these contents back into the XML document for further processing. By submitting an XML file that defines an external entity with a file:// URI, an attacker can cause the processing application to read the contents of a local file. For example, a URI such as “file:///c:/winnt/win.ini” designates (in Windows) the file C:\Winnt\win.ini, or file:///etc/passwd designates the password file in Unix-based systems. Using URIs with other schemes such as http://, the attacker can force the application to make outgoing requests to servers that the attacker cannot reach directly, which can be used to bypass firewall restrictions or hide the source of attacks such as port scanning. Once the content of the URI is read, it is fed back into the application that is processing the XML. This application may echo back the data (e.g. in an error message), thereby exposing the file contents.

Potential Mitigations

References