CVE-2021-23839
Vulnerability from cvelistv5
Published
2021-02-16 16:55
Modified
2024-09-17 03:59
Severity ?
Summary
Incorrect SSLv2 rollback protection
References
openssl-security@openssl.orghttps://cert-portal.siemens.com/productcert/pdf/ssa-637483.pdfPatch, Third Party Advisory
openssl-security@openssl.orghttps://git.openssl.org/gitweb/?p=openssl.git%3Ba=commitdiff%3Bh=30919ab80a478f2d81f2e9acdcca3fa4740cd547
openssl-security@openssl.orghttps://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA44846Third Party Advisory
openssl-security@openssl.orghttps://security.netapp.com/advisory/ntap-20210219-0009/Third Party Advisory
openssl-security@openssl.orghttps://security.netapp.com/advisory/ntap-20240621-0006/
openssl-security@openssl.orghttps://www.openssl.org/news/secadv/20210216.txtVendor Advisory
openssl-security@openssl.orghttps://www.oracle.com//security-alerts/cpujul2021.htmlPatch, Third Party Advisory
openssl-security@openssl.orghttps://www.oracle.com/security-alerts/cpuApr2021.htmlPatch, Third Party Advisory
openssl-security@openssl.orghttps://www.oracle.com/security-alerts/cpuapr2022.htmlPatch, Third Party Advisory
openssl-security@openssl.orghttps://www.oracle.com/security-alerts/cpuoct2021.htmlPatch, Third Party Advisory
Impacted products
OpenSSLOpenSSL
Show details on NVD website

To clipboard 

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The implementation of this padding check inverted the logic so that the connection attempt is accepted if the padding is present, and rejected if it is absent. This means that such as server will accept a connection if a version rollback attack has occurred. Further the server will erroneously reject a connection if a normal SSLv2 connection attempt is made. Only OpenSSL 1.0.2 servers from version 1.0.2s to 1.0.2x are affected by this issue. In order to be vulnerable a 1.0.2 server must: 1) have configured SSLv2 support at compile time (this is off by default), 2) have configured SSLv2 support at runtime (this is off by default), 3) have configured SSLv2 ciphersuites (these are not in the default ciphersuite list) OpenSSL 1.1.1 does not have SSLv2 support and therefore is not vulnerable to this issue. The underlying error is in the implementation of the RSA_padding_check_SSLv23() function. This also affects the RSA_SSLV23_PADDING padding mode used by various other functions. Although 1.1.1 does not support SSLv2 the RSA_padding_check_SSLv23() function still exists, as does the RSA_SSLV23_PADDING padding mode. Applications that directly call that function or use that padding mode will encounter this issue. However since there is no support for the SSLv2 protocol in 1.1.1 this is considered a bug and not a security issue in that version. OpenSSL 1.0.2 is out of support and no longer receiving public updates. Premium support customers of OpenSSL 1.0.2 should upgrade to 1.0.2y. Other users should upgrade to 1.1.1j. Fixed in OpenSSL 1.0.2y (Affected 1.0.2s-1.0.2x).\"},{\"lang\":\"es\",\"value\":\"OpenSSL versi\u00f3n 1.0.2 soporta SSLv2. Si un cliente intenta negociar SSLv2 con un servidor que est\u00e1 configurado para soportar tanto SSLv2 como versiones m\u00e1s recientes de SSL y TLS, entonces se hace una comprobaci\u00f3n de un ataque de retroceso de versi\u00f3n cuando se deshace una firma RSA. 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S\u00f3lo los servidores OpenSSL versi\u00f3n 1.0.2 desde la versi\u00f3n 1.0.2s hasta la 1.0.2x est\u00e1n afectados por este problema. Para ser vulnerable, un servidor versi\u00f3n 1.0.2 debe 1) haber configurado la compatibilidad con SSLv2 en tiempo de compilaci\u00f3n (est\u00e1 desactivada por defecto), 2) haber configurado la compatibilidad con SSLv2 en tiempo de ejecuci\u00f3n (est\u00e1 deshabilitada por defecto), 3) haber configurado los ciphersuites de SSLv2 (no est\u00e1n en la lista de ciphersuites por defecto) OpenSSL versi\u00f3n 1.1.1 no presenta compatibilidad con SSLv2 y, por tanto, no es vulnerable a este problema. El error subyacente est\u00e1 en la implementaci\u00f3n de la funci\u00f3n RSA_padding_check_SSLv23(). Esto tambi\u00e9n afecta al modo de relleno RSA_SSLV23_PADDING usado por otras funciones. Aunque la versi\u00f3n 1.1.1 no soporta SSLv2, la funci\u00f3n RSA_padding_check_SSLv23() sigue existiendo, al igual que el modo de relleno RSA_SSLV23_PADDING. Las aplicaciones que llamen directamente a esa funci\u00f3n o utilicen ese modo de relleno se encontrar\u00e1n con este problema. Sin embargo, como no existe soporte para el protocolo SSLv2 en la versi\u00f3n 1.1.1, esto se considera un error y no un problema de seguridad en esa versi\u00f3n. OpenSSL versi\u00f3n 1.0.2 est\u00e1 fuera de soporte y ya no recibe actualizaciones p\u00fablicas. Los clientes de soporte Premium de OpenSSL versi\u00f3n 1.0.2 deben actualizar a la versi\u00f3n 1.0.2y. Los dem\u00e1s usuarios deben actualizar a la versi\u00f3n 1.1.1j. Corregido en OpenSSL versi\u00f3n 1.0.2y (Afect\u00f3 versiones 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  }
}


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