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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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. 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Corregido en OpenSSL versi\u00f3n 1.0.2y (Afect\u00f3 versiones 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  }
}


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