CVE-2020-6270 - Missing Authorization

Severity

65%

Complexity

27%

Confidentiality

60%

SAP NetWeaver AS ABAP (Banking Services), versions - 710, 711, 740, 750, 751, 752, 75A, 75B, 75C, 75D, 75E, does not perform necessary authorization checks for an authenticated user due to Missing Authorization Check, allowing wrong and unexpected change of individual conditions by a malicious user leading to wrong prices.

CVSS 3.1 Base Score 6.5. CVSS Attack Vector: network. CVSS Attack Complexity: low. CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N).

CVSS 2.0 Base Score 4. CVSS Attack Vector: network. CVSS Attack Complexity: low. CVSS Vector: (AV:N/AC:L/Au:S/C:N/I:P/A:N).

Demo Examples

Missing Authorization

CWE-862

This function runs an arbitrary SQL query on a given database, returning the result of the query.


               
$employeeRecord = runEmployeeQuery('EmployeeDB',$_GET['EmployeeName']);
return $preparedStatement->fetchAll();//Use a prepared statement to avoid CWE-89
/.../

While this code is careful to avoid SQL Injection, the function does not confirm the user sending the query is authorized to do so. An attacker may be able to obtain sensitive employee information from the database.

Missing Authorization

CWE-862

The following program could be part of a bulletin board system that allows users to send private messages to each other. This program intends to authenticate the user before deciding whether a private message should be displayed. Assume that LookupMessageObject() ensures that the $id argument is numeric, constructs a filename based on that id, and reads the message details from that file. Also assume that the program stores all private messages for all users in the same directory.


               
DisplayPrivateMessage($id);
print "Body: " . encodeHTML($Message->{body}) . "\n";
# For purposes of this example, assume that CWE-309 and# CWE-523 do not apply.
ExitError("invalid username or password");

While the program properly exits if authentication fails, it does not ensure that the message is addressed to the user. As a result, an authenticated attacker could provide any arbitrary identifier and read private messages that were intended for other users.

One way to avoid this problem would be to ensure that the "to" field in the message object matches the username of the authenticated user.

Overview

Type

SAP NetWeaver AS ABAP

First reported 4 years ago

2020-06-10 13:15:00

Last updated 4 years ago

2020-06-16 14:41:00

Affected Software

SAP NetWeaver AS ABAP 75A

75a

SAP NetWeaver AS ABAP 75B

75b

SAP NetWeaver AS ABAP 75C

75c

SAP NetWeaver AS ABAP 75D

75d

SAP NetWeaver AS ABAP 75E

75e

SAP NetWeaver AS ABAP 710

710

SAP NetWeaver AS ABAP 711

711

SAP NetWeaver AS ABAP 740

740

SAP NetWeaver AS ABAP 750

750

SAP NetWeaver AS ABAP 751

751

SAP NetWeaver AS ABAP 752

752

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