CVE-2016-3685 in Download Manager
Summary
by MITRE
SAP Download Manager 2.1.142 and earlier generates an encryption key from a small key space on Windows and Mac systems, which allows context-dependent attackers to obtain sensitive configuration information by leveraging knowledge of a hardcoded key in the program code and a computer BIOS serial number, aka SAP Security Note 2282338.
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Analysis
by VulDB Data Team • 07/07/2019
The vulnerability identified as CVE-2016-3685 affects SAP Download Manager versions 2.1.142 and earlier, presenting a significant cryptographic weakness that compromises the security of sensitive configuration data. This flaw specifically manifests on Windows and Mac operating systems where the application generates encryption keys from a limited key space, making the system susceptible to exploitation through predictable key derivation methods.
The technical implementation of this vulnerability stems from the application's use of a hardcoded encryption key embedded within the program code combined with the computer's BIOS serial number to generate encryption keys. This approach violates fundamental cryptographic principles by creating a deterministic key generation process that relies on predictable system identifiers. The combination of the hardcoded key with the BIOS serial number creates a relatively small key space that can be enumerated or guessed through brute force attacks, particularly when attackers have access to the target system's BIOS serial number.
From an operational perspective, this vulnerability enables context-dependent attackers to obtain sensitive configuration information that could include network credentials, system parameters, or other confidential data stored within the SAP Download Manager. The attack vector requires the adversary to possess knowledge of the hardcoded key present in the application code and access to the target system's BIOS serial number, which are both relatively accessible pieces of information. This weakness particularly impacts organizations using SAP Download Manager for software distribution and configuration management, where the exposure of sensitive configuration data could lead to further system compromise or unauthorized access to enterprise resources.
The vulnerability aligns with CWE-326, which addresses the use of weak encryption algorithms or key derivation methods, and represents a classic example of poor key management practices in cryptographic implementations. From an ATT&CK framework perspective, this vulnerability maps to techniques involving credential access through exploitation of weak cryptographic implementations and system information discovery. Organizations may face risks including unauthorized access to SAP environments, potential data breaches, and compromise of enterprise software distribution channels that rely on the affected download manager.
The recommended mitigation strategy involves immediate upgrading to SAP Download Manager versions that address this cryptographic weakness through implementation of stronger key derivation functions or adoption of industry-standard cryptographic libraries. Organizations should also implement network monitoring to detect potential exploitation attempts and consider disabling the affected functionality if it is not critical for operations. Additionally, regular security assessments should verify that cryptographic implementations meet current security standards and that hardcoded keys are properly managed within software applications.