Описание
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).
Ссылки
- Mailing ListThird Party Advisory
- Mailing ListThird Party Advisory
- Mailing ListThird Party Advisory
- Mailing ListThird Party Advisory
- Mailing ListThird Party Advisory
- Mailing ListThird Party Advisory
- Third Party AdvisoryVDB Entry
- Third Party Advisory
- Third Party Advisory
- Third Party Advisory
- Third Party Advisory
- Third Party Advisory
- Third Party Advisory
- Third Party Advisory
- Mailing ListThird Party Advisory
- Third Party Advisory
Уязвимые конфигурации
Одно из
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Одновременно
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Одновременно
Одновременно
Одновременно
Одновременно
Одно из
Одно из
Одновременно
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Одновременно
Одно из
Одно из
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Одно из
EPSS
5.9 Medium
CVSS3
4.3 Medium
CVSS2
Дефекты
Связанные уязвимости
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).
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).
If an application encounters a fatal protocol error and then calls SSL ...
EPSS
5.9 Medium
CVSS3
4.3 Medium
CVSS2