ERPScanERPSCAN-17-001SAP AS JAVA DoS in BC-IAM-SSO-OTP package via QR Servlet
0.003 Low
EPSS
Percentile
66.3%
Application: SAP AS JAVA SSO Authentication Library **Versions Affected:**SAP AS JAVA SSO Authentication Library 2.0-3.0 **Vendor URL: ** SAP **Bugs:**DoS **Reported:**01.11.2016 **Vendor response:**02.11.2016 **Date of Public Advisory:**10.01.2017 **Reference:**SAP Security Note 2389042 Author: Vahagn Vardanyan (ERPScan)
VULNERABILITY INFORMATION
Class: Denial of service
Impact: direct impact on availability
Remotely Exploitable: yes
Locally Exploitable: no
CVE: CVE-2017-7696
CVSS Information
CVSS Base Score v3: 7.5 / 10
CVSS Base Vector:
| AV: Attack Vector (Related exploit range) | Network (N) |
|---|---|
| AC: Attack Complexity (Required attack complexity) | Low (L) |
| PR: Privileges Required (Level of privileges needed to exploit) | None (N) |
| UI: User Interaction (Required user participation) | None (N) |
| S: Scope (Change in scope due to impact caused to components beyond the vulnerable component) | Unchanged (U) |
| C: Impact to Confidentiality | None (N) |
| I: Impact to Integrity | None(N) |
| A: Impact to Availability | High (H) |
Description
If a certain request is sent, a server will try to generate a large image that takes a long time to process.
Business risk
An attacker can use a Denial of Service vulnerability to terminate the process of a vulnerable component. In the meantime, nobody can use this service. This fact negatively influences business processes, system downtime, and business reputation.
VULNERABLE PACKAGES
SSO AUTHENTICATION LIBRARY 2.0
SSO AUTHENTICATION LIBRARY 3.0
SOLUTIONS AND WORKAROUNDS
To correct this vulnerability, install SAP Security Note 2389042.
TECHNICAL DESCRIPTION
If the request is sent, server will try to generate a large image (100000000 px) server side, consequently, it takes all internal memory to generate the image.
PoC
http://SAP_SERVER:50000/otp_logon_ui_resources/qr?url=aaa&width=100000000&height=100000000
1
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http://SAP_SERVER:50000/otp_logon_ui_resources/qr?url=aaa&width=100000000&height=100000000
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