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ALPINE-CVE-2019-1559

ALPINE-CVE-2019-1559

This page contains facts from public vulnerability sources. Check the original advisory before updating.

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 detectable to the remote peer, then this amounts to a padding oracle that could be used to decrypt data. In order for this to be exploitable "non-stitched" ciphersuites must be in use. Stitched ciphersuites are optimised implementations of certain commonly used ciphersuites. Also the application must call SSL_shutdown() twice even if a protocol error has occurred (applications should not do this but some do anyway). Fixed in OpenSSL 1.0.2r (Affected 1.0.2-1.0.2q).

CVSS 5.9 · Medium · Fix available

Published
Updated

Stack: system · network

Affected products and versions

  • openssl Alpine:v3.6

    Affected ranges
    • ECOSYSTEM: ≥ 1.0.2, < 1.0.2r-r0

    Update to 1.0.2r-r0

  • openssl Alpine:v3.7

    Affected ranges
    • ECOSYSTEM: ≥ 1.0.2, < 1.0.2r-r0

    Update to 1.0.2r-r0

  • openssl Alpine:v3.8

    Affected ranges
    • ECOSYSTEM: ≥ 1.0.2, < 1.0.2r-r0

    Update to 1.0.2r-r0

Original sources

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