| CVSS Meta Temp Score | Current Exploit Price (≈) | CTI Interest Score |
|---|---|---|
| 4.5 | $0-$5k | 0.00 |
Summary
A vulnerability was found in Intel CPU. It has been declared as critical. Affected by this vulnerability is an unknown functionality of the component Lazy FPU Register Handler. Executing a manipulation can lead to information disclosure (LazyFP). This vulnerability is tracked as CVE-2018-3665. The attack can be launched remotely. No exploit exists. It is advised to implement the suggested workaround.
Details
A vulnerability was found in Intel CPU (Chip Software) (version now known). It has been declared as problematic. This vulnerability affects some unknown processing of the component Lazy FPU Register Handler. The manipulation with an unknown input leads to a information disclosure vulnerability (LazyFP). The CWE definition for the vulnerability is CWE-200. The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. As an impact it is known to affect confidentiality. CVE summarizes:
System software utilizing Lazy FP state restore technique on systems using Intel Core-based microprocessors may potentially allow a local process to infer data from another process through a speculative execution side channel.
The bug was discovered 06/13/2018. The weakness was disclosed 06/06/2018 by Julian Stecklina and Thomas Prescher as Intel LazyFP vulnerability: Exploiting lazy FPU state switching as confirmed blog post (Website). The advisory is available at blog.cyberus-technology.de. The public release has been coordinated in cooperation with the vendor. This vulnerability was named CVE-2018-3665 since 12/28/2017. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. The technical details are unknown and an exploit is not available. This vulnerability is assigned to T1592 by the MITRE ATT&CK project. The advisory points out:
The register state of the floating point unit (FPU), which consists of the AVX, MMX and SSE register sets, can be leaked across protection domain boundaries. This includes leaking across process- and virtual machine boundaries. The FPU state may contain sensitive information such as cryptographic keys. As an example, the Intel AES instruction set (AES-NI) uses FPU registers to store round keys. It is only possible to exploit when the underlying operating system or hypervisor uses lazy FPU switching.
The vulnerability scanner Nessus provides a plugin with the ID 110624 (Debian DSA-4232-1 : xen - security update), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Debian Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 390158 (Oracle VM Server for x86 Security Update for xen (OVMSA-2018-0272)).
It is possible to mitigate the problem by applying the configuration setting eagerfpu=on. A possible mitigation has been published 2 weeks after the disclosure of the vulnerability.
The vulnerability is also documented in the databases at Tenable (110624), SecurityFocus (BID 103774†) and SecurityTracker (ID 1041125†). Additional details are provided at aws.amazon.com. The entries VDB-111327, VDB-112151, VDB-113918 and VDB-113919 are pretty similar. If you want to get best quality of vulnerability data, you may have to visit VulDB.
Affected
- Linux Kernel
Product
Type
Vendor
Name
License
Website
- Vendor: https://www.intel.com/
CPE 2.3
CPE 2.2
CVSSv4
VulDB Vector: 🔍VulDB Reliability: 🔍
CVSSv3
VulDB Meta Base Score: 4.6VulDB Meta Temp Score: 4.6
VulDB Base Score: 3.7
VulDB Temp Score: 3.6
VulDB Vector: 🔍
VulDB Reliability: 🔍
NVD Base Score: 5.6
NVD Vector: 🔍
CVSSv2
| AV | AC | Au | C | I | A |
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| 💳 | 💳 | 💳 | 💳 | 💳 | 💳 |
| 💳 | 💳 | 💳 | 💳 | 💳 | 💳 |
| 💳 | 💳 | 💳 | 💳 | 💳 | 💳 |
| Vector | Complexity | Authentication | Confidentiality | Integrity | Availability |
|---|---|---|---|---|---|
| Unlock | Unlock | Unlock | Unlock | Unlock | Unlock |
| Unlock | Unlock | Unlock | Unlock | Unlock | Unlock |
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍
NVD Base Score: 🔍
Exploiting
Name: LazyFPClass: Information disclosure / LazyFP
CWE: CWE-200 / CWE-284 / CWE-266
CAPEC: 🔍
ATT&CK: 🔍
Physical: Partially
Local: Yes
Remote: Yes
Availability: 🔍
Status: Not defined
EPSS Score: 🔍
EPSS Percentile: 🔍
Price Prediction: 🔍
Current Price Estimation: 🔍
| 0-Day | Unlock | Unlock | Unlock | Unlock |
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| Today | Unlock | Unlock | Unlock | Unlock |
Nessus ID: 110624
Nessus Name: Debian DSA-4232-1 : xen - security update
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍
Qualys ID: 🔍
Qualys Name: 🔍
Threat Intelligence
Interest: 🔍Active Actors: 🔍
Active APT Groups: 🔍
Countermeasures
Recommended: WorkaroundStatus: 🔍
Reaction Time: 🔍
0-Day Time: 🔍
Exposure Time: 🔍
Config: eagerfpu=on
Timeline
12/28/2017 🔍04/13/2018 🔍
06/06/2018 🔍
06/13/2018 🔍
06/14/2018 🔍
06/14/2018 🔍
06/20/2018 🔍
06/21/2018 🔍
06/21/2018 🔍
02/19/2020 🔍
Sources
Vendor: intel.comAdvisory: Intel LazyFP vulnerability: Exploiting lazy FPU state switching
Researcher: Julian Stecklina, Thomas Prescher
Status: Confirmed
Confirmation: 🔍
Coordinated: 🔍
CVE: CVE-2018-3665 (🔍)
GCVE (CVE): GCVE-0-2018-3665
GCVE (VulDB): GCVE-100-119482
OVAL: 🔍
SecurityFocus: 103774 - Linux Kernel CVE-2018-10087 Local Denial of Service Vulnerability
SecurityTracker: 1041125
Misc.: 🔍
See also: 🔍
Entry
Created: 06/14/2018 08:33Updated: 02/19/2020 13:39
Changes: 06/14/2018 08:33 (76), 02/19/2020 13:39 (18)
Complete: 🔍
Cache ID: 216::103
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