Security readout for executives and security teams
Plain-English summary
CVE-2020-8905 is a low-severity information disclosure issue in Google Asylo before 0.6.0. A local, low-privileged attacker could cause trusted memory data to be copied into an untrusted buffer. Business urgency is limited unless Asylo protects sensitive enclave workloads.
Executive priority
Treat as a scheduled maintenance fix unless Asylo is used for sensitive enclave processing. There is a named upgrade path and no supplied evidence of active exploitation, but confidentiality controls should not rely on vulnerable pre-0.6.0 builds.
Technical view
The flaw is in Asylo's enc_untrusted_recvfrom handling. A return value is deserialized by MessageReader and copied into three extents. The third extent length is externally controlled and not verified during copy, allowing unintended trusted-memory disclosure to an untrusted buffer.
Likely exposure
Exposure is likely limited to systems using Google Asylo versions before 0.6.0. The CVE record does not provide CPEs or a broader affected product list, so confirm use through dependency and build inventories.
Exploitation context
The source bundle does not show CISA KEV listing or cited active exploitation. CVSS indicates local attack vector, high attack complexity, low privileges required, no user interaction, and low confidentiality impact only.
Researcher notes
Evidence is limited to the CVE record and Google Asylo commit reference. Do not infer impact on other Google products. Focus validation on pre-0.6.0 Asylo builds and the externally controlled third extent length check.
Mitigation direction
- Upgrade Asylo to version 0.6.0 or later.
- Identify applications built with Asylo versions before 0.6.0.
- Review Google Asylo vendor guidance before applying any backport.
- Prioritize remediation where enclave confidentiality protects sensitive data.
Validation and detection
- Inventory Asylo versions in source, vendored dependencies, and build artifacts.
- Confirm deployed workloads were rebuilt with Asylo 0.6.0 or later.
- Review affected code paths using enc_untrusted_recvfrom.
- Verify tests cover length validation for untrusted receive data.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-120: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2020-8905 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Low
- CVSS
- 2.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:L/I:N/A:N
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:L/I:N/A:N1.11.4Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
2.8LowVector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:L/I:N/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/google/asylo/commit/299f804acbb95a612ab7c504d25ab908aa59ae93CVE reference · x_refsource_CONFIRM
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
Buffer Copy without Checking Size of Input ('Classic Buffer Overflow') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.