User enumeration In openssl
Description
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).
Mitigation
Update Impact
Minimal update. May introduce new vulnerabilities or breaking changes.
Ecosystem | Component | Affected version | Patched versions |
|---|---|---|---|
 alpine v3.6 | 1.0.2r-r0 | ||
alpine v3.8 | 1.0.2r-r0 | ||
alpine v3.7 | 1.0.2r-r0 | ||
 debian 14 | 1.1.0b-2 | ||
debian 12 | 1.1.0b-2 | ||
debian 13 | 1.1.0b-2 | ||
 rpm rhel8 | - | - | |
rpm rhel7 | - | - | |
rpm rhel5 | - | - | |
rpm rhel6 | 0:1.0.1e-58.el6_10 |
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Aliases
References