CVE-2018-3639 is a vulnerability affecting systems with microprocessors that use speculative execution, a technique used to improve performance. This vulnerability, also known as Speculative Store Bypass (SSB) or Variant 4, can potentially lead to unauthorized disclosure of information through a side-channel analysis. It has a severity rating of 5.5 (MEDIUM) on the Common Vulnerability Scoring System (CVSS).

How do I know if I'm affected?

To determine if you're affected by the vulnerability, you should check if your system uses microprocessors that utilize speculative execution. A wide range of Intel processors, including various Atom, Celeron, Core, Pentium, and Xeon models, as well as ARM Cortex-A processors, are affected. Additionally, various software configurations from Red Hat, Debian, Canonical (Ubuntu), Siemens, Oracle, Mitel, SonicWall, Schneider Electric, NVIDIA, Microsoft, and others are known to be impacted by this vulnerability. If your system uses any of these processors or software configurations, it's possible that you're affected by CVE-2018-3639.

What should I do if I'm affected?

If you're affected by the vulnerability, it's important to update your system with the latest security patches provided by your hardware and software vendors. This may involve updating your operating system, firmware, or other software components. Always follow the vendor's recommended update procedures and consult their support resources if you need assistance.

Is this in CISA’s Known Exploited Vulnerabilities Catalog?

Yes, it is in CISA's Known Exploited Vulnerabilities Catalog. The vulnerability, named Speculative Store Bypass (SSB) or Variant 4, allows unauthorized disclosure of information through side-channel analysis. To address this issue, it's important to update your system with the latest security patches and ensure that your CPU microcode is up-to-date. The vulnerability is present in hardware, so a complete fix requires both software updates and an up-to-date CPU microcode.

Weakness enumeration

The weakness enumeration for this vulnerability is categorized as CWE-203, also known as Speculative Store Bypass (SSB) or Variant 4, and is related to an observable discrepancy in microprocessors using speculative execution. This can lead to unauthorized information disclosure through side-channel analysis.

For more details

CVE-2018-3639, or Speculative Store Bypass (SSB) Variant 4, is a vulnerability that affects systems with microprocessors using speculative execution. To protect your system, it's crucial to apply the latest security patches and ensure your CPU microcode is up-to-date. For a comprehensive understanding of the vulnerability, including its description, severity, technical details, and known affected software configurations, visit the NVD page or the links below.

• openSUSE Security Update for java-1_8_0-openjdk

• Fujitsu CPU Hardware Vulnerabilities

• Red Hat Enterprise Linux 7 Security Advisory

• Openwall Discussion on SSBD Related Flaws