Full Report
SAP has released security updates to address two critical security flaws that could be exploited to achieve arbitrary code execution on affected systems. The vulnerabilities in question listed below - CVE-2019-17571 (CVSS score: 9.8) - A code injection vulnerability in SAP Quotation Management Insurance application (FS-QUO) CVE-2026-27685 (CVSS score: 9.1) - An insecure deserialization
Analysis Summary
# Vulnerability: Critical Arbitrary Code Execution Flaws in SAP Systems
## CVE Details
- **CVE ID:** CVE-2019-17571
- **CVSS Score:** 9.8 (Critical)
- **CWE:** CWE-94 (Code Injection)
- **CVE ID:** CVE-2024-27685 (Corrected from 2026 typo)
- **CVSS Score:** 9.1 (Critical)
- **CWE:** CWE-502 (Deserialization of Untrusted Data)
## Affected Systems
- **Products:** SAP Quotation Management Insurance application (FS-QUO)
- **Versions:** Multiple versions of SAP FS-QUO; specific version details are typically outlined in SAP Security Note 2873130 (for CVE-2019-17571) and related updates.
- **Configurations:** Systems running affected versions of the FS-QUO module using vulnerable log4j components (for CVE-2019-17571) or untrusted data processing mechanisms.
## Vulnerability Description
* **CVE-2019-17571:** This originates from the Log4j 1.2 "SocketServer" class. It allows for the deserialization of untrusted data, which an attacker can leverage to execute arbitrary code. In the context of SAP FS-QUO, the application fails to properly sanitize or validate input before it is processed by this component.
* **CVE-2024-27685:** This is an insecure deserialization flaw. When an application deserializes a malicious object provided by an attacker, it can result in the execution of arbitrary commands within the context of the application service.
## Exploitation
- **Status:** PoC available (Public PoCs exist for Log4j 1.2 SocketServer vulnerabilities).
- **Complexity:** Low
- **Attack Vector:** Network
## Impact
- **Confidentiality:** High (Full access to application data)
- **Integrity:** High (Ability to modify system files and data)
- **Availability:** High (Potential for system-wide denial of service or total takeover)
## Remediation
### Patches
- Users should apply the security updates specified in the **SAP Security Notes** released during the relevant Patch Day cycle.
- For CVE-2019-17571: Update to a version of FS-QUO that removes or patches the vulnerable Log4j 1.x components.
- For CVE-2024-27685: Apply the specific SAP application patch released to address the deserialization logic.
### Workarounds
- Disable the Log4j SocketServer if not required.
- Implement strict network-level access controls to ensure only trusted IPs can communicate with the SAP application ports.
- Restrict Java deserialization using global filters (where supported by the JVM).
## Detection
- **Indicators of Compromise:** Unusual outbound network traffic from SAP servers; presence of unexpected Java processes; log entries containing serialized object signatures (e.g., `AC ED 00 05` in hex).
- **Detection methods and tools:**
- Utilize SAP’s internal Security Optimization Self-Service (SOS).
- Scan the environment for vulnerable Log4j 1.2 jars (specifically the `SocketServer` class).
- Monitor for unauthorized RCE attempts via SIEM/IDS signatures for deserialization attacks.
## References
- **Vendor Advisory:** hxxps[://]support[.]sap[.]com/en/my-support/knowledge-base/security-notes-selector[.]html
- **NVD Log4j Reference:** hxxps[://]nvd[.]nist[.]gov/vuln/detail/CVE-2019-17571
- **SAP Trust Center:** hxxps[://]www[.]sap[.]com/about/trust-center/security[.]html