SARA / Free Tools / CVE / CVE-2019-1559

CVE-2019-1559 — If an application encounters a fatal protocol error and then calls SSL_shutdown(

If an application encounters a fatal protocol error and then calls SSL_shutdown() twice (once to send a close_notify, and once to receive one) then OpenSSL can respond differently to the calling application if a 0 byte record is received with invalid padding compared to if a 0 by

CVSS
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EPSS
4.96% (top 10.40%)
CWE
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Published
2019-02-27T23:00:00.000Z
Last modified
2024-09-17T04:20:35.057Z
CVSS vector
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01What is this vulnerability?

If an application encounters a fatal protocol error and then calls SSL_shutdown() twice (once to send a close_notify, and once to receive one) then OpenSSL can respond differently to the calling application if a 0 byte record is received with invalid padding compared to if a 0 byte record is received with an invalid MAC. If the application then behaves differently based on that in a way that is…

02Affected products

VendorProductVersions
OpenSSLOpenSSLFixed in OpenSSL 1.0.2r (Affected 1.0.2-1.0.2q)

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

09References

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