The vulnerable system is bound to the network stack and the set of possible attackers extends beyond the other options listed below, up to and including the entire Internet. Such a vulnerability is often termed “remotely exploitable” and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers). An example of a network attack is an attacker causing a denial of service by sending a specially crafted TCP packet across a wide area network (e.g., CVE-2004-0230).
Attack Complexity
Low
AC
The attacker must take no measurable action to exploit the vulnerability. The attack requires no target-specific circumvention to exploit the vulnerability. An attacker can expect repeatable success against the vulnerable system.
Privileges Required
None
PR
The attacker is unauthenticated prior to attack, and therefore does not require any access to settings or files of the vulnerable system to carry out an attack.
User Interaction
None
UI
The vulnerable system can be exploited without interaction from any human user, other than the attacker. Examples include: a remote attacker is able to send packets to a target system a locally authenticated attacker executes code to elevate privileges
Scope
Unchanged
S
An exploited vulnerability can only affect resources managed by the same security authority. In the case of a vulnerability in a virtualized environment, an exploited vulnerability in one guest instance would not affect neighboring guest instances.
Confidentiality
High
C
There is total information disclosure, resulting in all data on the system being revealed to the attacker, or there is a possibility of the attacker gaining control over confidential data.
Integrity
High
I
There is a total compromise of system integrity. There is a complete loss of system protection, resulting in the attacker being able to modify any file on the target system.
Availability
High
A
There is a total shutdown of the affected resource. The attacker can deny access to the system or data, potentially causing significant loss to the organization.
Below is a copy: SAP Netweaver JAVA 7.50 Missing Authorization
# Onapsis Security Advisory 2021-0013: [CVE-2020-26829] - Missing
Authentication Check In SAP NetWeaver AS JAVA P2P Cluster
communication
## Impact on Business
A malicious unauthenticated user could abuse the lack of authentication
check on SAP Java P2P cluster communication, in order to connect to the
respective TCP ports and perform different privileged actions, such as:
- Installing new trusted SSO providers
- Changing database connection parameters
- Gaining access to configuration information
## Advisory Information
- Public Release Date: 06/14/2021
- Security Advisory ID: ONAPSIS-2021-0013
- Researcher(s): Ignacio D. Favro
## Vulnerability Information
- Vendor: SAP
- Affected Components: SAP Netweaver JAVA version 7.10 - 7.50
(Check SAP Note <XXX> for detailed information on affected releases)
- Vulnerability Class: [CWE-306] Missing Authentication for Critical Function
- CVSS v3 score: 10.0 (AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H)
- Risk Level: Critical
- Assigned CVE: CVE-2020-26829
- Vendor patch Information: SAP Security NOTE 2974774
## Affected Components Description
SAP Netweaver JAVA version 7.10 - 7.50
(Check SAP Note #2974774 for detailed information on affected releases)
## Vulnerability Details
The Cluster Manager introduced in SAP AS Java since 7.10, listens by
default on all interfaces.
The TCP port where the CM listens is defined, as several SAP products,
by a port pattern. In
this case the following structure defined the port:
**50000+100*<instance_number>+20+<node>*5**,
Where <instance_numbers> refers to the JAVA instance number of the
system and <node> the node
number within the custer.
Due to several missing authentication checks, a threat actor that is
able to reach the Cluster
Manager TCP port, could execute highly privileged actions allowing
them to gain SAP system
administrator access or perform denial of service without
authentication among others.
## Solution
SAP has released SAP Note 2974774 which provide patched versions of the
affected components.
The patches can be downloaded
fromhttps://launchpad.support.sap.com/#/notes/2974774.
Onapsis strongly recommends SAP customers to download the related
security fixes and apply them to the affected components in order to
reduce business risks.
## Report Timeline
- 08/26/2020: Onapsis provides vulnerability details to SAP
- 08/26/2020: SAP provides internal tracking number
- 10/12/2020: SAP provides update: Vulnerability confirmed fix in progress
- 12/08/2020: SAP releases SAP Note fixing the issue.
## References
- Onapsis blogpost: https://onapsis.com/blog/sap-security-notes-december-2020
- CVE Mitre: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-26829
- Vendor Patch: https://launchpad.support.sap.com/#/notes/2974774
## About Onapsis Research Labs
Onapsis Research Labs provides the industry analysis of key security
issues that impact business-critical systems and applications.
Delivering frequent and timely security and compliance advisories with
associated risk levels, Onapsis Research Labs combine in-depth knowledge
and experience to deliver technical and business-context with sound
security judgment to the broader information security community.
Find all reported vulnerabilities at
https://github.com/Onapsis/vulnerability_advisories
## About Onapsis, Inc.
Onapsis protects the mission-critical applications that run the global economy,
from the core to the cloud. The Onapsis Platform uniquely delivers actionable
insight, secure change, automated governance and continuous monitoring
for critical
systemsERP, CRM, PLM, HCM, SCM and BI applicationsfrom leading
vendors such as SAP,
Oracle, Salesforce and others, while keeping them protected and compliant.
For more information, connect with us on Twitter or LinkedIn, or visit
us athttps://www.onapsis.com.
## License
This advisory is licensed under a [Creative Commons 4.0 BY-ND
International License](https://creativecommons.org/licenses/by-nd/4.0/legalcode)
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