cve-2021-23839
Vulnerability from cvelistv5
Published
2021-02-16 16:55
Modified
2024-09-17 03:59
Severity ?
Summary
OpenSSL 1.0.2 supports SSLv2. If a client attempts to negotiate SSLv2 with a server that is configured to support both SSLv2 and more recent SSL and TLS versions then a check is made for a version rollback attack when unpadding an RSA signature. Clients that support SSL or TLS versions greater than SSLv2 are supposed to use a special form of padding. A server that supports greater than SSLv2 is supposed to reject connection attempts from a client where this special form of padding is present, because this indicates that a version rollback has occurred (i.e. both client and server support greater than SSLv2, and yet this is the version that is being requested). 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).
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
af854a3a-2127-422b-91ae-364da2661108https://cert-portal.siemens.com/productcert/pdf/ssa-637483.pdfPatch, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://git.openssl.org/gitweb/?p=openssl.git%3Ba=commitdiff%3Bh=30919ab80a478f2d81f2e9acdcca3fa4740cd547
af854a3a-2127-422b-91ae-364da2661108https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA44846Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://security.netapp.com/advisory/ntap-20210219-0009/Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://security.netapp.com/advisory/ntap-20240621-0006/
af854a3a-2127-422b-91ae-364da2661108https://www.openssl.org/news/secadv/20210216.txtVendor Advisory
af854a3a-2127-422b-91ae-364da2661108https://www.oracle.com//security-alerts/cpujul2021.htmlPatch, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://www.oracle.com/security-alerts/cpuApr2021.htmlPatch, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://www.oracle.com/security-alerts/cpuapr2022.htmlPatch, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://www.oracle.com/security-alerts/cpuoct2021.htmlPatch, Third Party Advisory
Impacted products
Vendor Product Version
Show details on NVD website

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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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Sightings

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  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
  • Confirmed: The vulnerability is confirmed from an analyst perspective.
  • Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
  • Patched: This vulnerability was successfully patched by the user reporting the sighting.
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  • Not confirmed: The user expresses doubt about the veracity of the vulnerability.
  • Not patched: This vulnerability was not successfully patched by the user reporting the sighting.