CVE-2017-5715 in Diameter Signaling Router (DSR)
Summary
by MITRE
Systems with microprocessors utilizing speculative execution and indirect branch prediction may allow unauthorized disclosure of information to an attacker with local user access via a side-channel analysis.
Be aware that VulDB is the high quality source for vulnerability data.
Analysis
by VulDB Data Team • 09/14/2025
CVE-2017-5715 represents a critical vulnerability in modern microprocessors that exploits speculative execution mechanisms to enable unauthorized information disclosure. This vulnerability specifically affects systems utilizing indirect branch prediction and speculative execution features, making it particularly dangerous as it operates at the hardware level rather than through traditional software exploits. The flaw enables local attackers to perform side-channel analysis that can reveal sensitive data stored in processor caches and memory. The vulnerability affects a wide range of processors including those from intel, amd, and arm architectures, creating widespread impact across enterprise and consumer systems. This issue falls under the broader category of side-channel attacks that leverage timing and cache behavior to extract confidential information. The underlying technical mechanism involves the processor's ability to predict branch targets and execute instructions speculatively before the actual branch decision is confirmed, creating opportunities for information leakage through cache state manipulation. The vulnerability is classified as a side-channel attack pattern that aligns with attack techniques described in the attack tree framework and represents a fundamental flaw in processor design that affects multiple generations of microprocessors.
The technical implementation of CVE-2017-5715 exploits the processor's speculative execution engine to access data that should normally remain protected by memory access controls. When the processor speculatively executes instructions based on predicted branch outcomes, it may load data into cache lines that can be observed by an attacker through cache timing analysis. This occurs because the speculative execution process does not fully validate memory access permissions until after the speculative execution completes, leaving a window where sensitive information can be extracted through cache state monitoring. The vulnerability specifically targets the indirect branch prediction mechanism where the processor attempts to predict the target of function calls and jumps. Attackers can leverage this by crafting specific sequences of instructions that cause the processor to speculatively execute code paths that access protected memory regions. This technique allows attackers to reconstruct sensitive data such as cryptographic keys, passwords, and other confidential information that may be cached during the speculative execution process. The flaw is particularly insidious because it operates below the level of traditional security controls and can be exploited even when the system appears to be functioning normally. The vulnerability demonstrates a fundamental weakness in the processor's memory management and cache coherency mechanisms that were not adequately addressed during the design phase.
The operational impact of CVE-2017-5715 extends far beyond simple information disclosure, as it fundamentally compromises the security model of modern computing systems. Organizations that deploy affected processors face significant risks including data breaches, intellectual property theft, and potential compromise of cryptographic systems that rely on secret key protection. The vulnerability affects not only individual systems but also cloud environments where multiple tenants share physical hardware, creating opportunities for cross-tenant information leakage. System administrators must consider the implications for virtualized environments where hypervisors and guest operating systems may be vulnerable to attacks that exploit this flaw. The impact is particularly severe for systems handling sensitive data such as financial records, personal information, and government secrets where even partial information leakage could have substantial consequences. Additionally, the vulnerability affects database systems, web applications, and any software that relies on processor-level security features to protect confidential information. The widespread nature of affected processors means that organizations across all industries must urgently assess their exposure and implement mitigation strategies. The vulnerability also creates challenges for compliance with security standards such as pci dss, hipaa, and iso 27001, as it represents a fundamental failure in the underlying hardware security architecture.
Mitigation strategies for CVE-2017-5715 require a multi-layered approach that addresses both software and hardware components of affected systems. Operating system vendors have released patches and updates that implement various mitigations including kernel page table isolation, retpoline, and other software-based protections that limit the ability of attackers to exploit speculative execution vulnerabilities. Organizations should implement comprehensive patch management programs to ensure all affected systems receive timely updates, though these patches may introduce performance overhead that must be carefully evaluated. Hardware-level mitigations include microcode updates from processor manufacturers that modify the processor's speculative execution behavior to prevent information leakage. System administrators should also consider implementing additional security controls such as memory access monitoring, cache state auditing, and network-based intrusion detection systems to detect potential exploitation attempts. The mitigation process must account for the fact that complete protection may not be achievable through software patches alone, and organizations should evaluate their risk tolerance and implement layered security approaches. Security teams should also monitor for related vulnerabilities such as those identified in the cve database under the same vulnerability family, as similar exploitation techniques may be applicable to other processor flaws. The industry response to CVE-2017-5715 has led to significant improvements in processor security design and has influenced the development of new security standards and guidelines for hardware security features.