cve-2023-3446
Vulnerability from cvelistv5
Published
2023-07-19 11:31
Modified
2024-08-02 06:55
Severity
Summary
Excessive time spent checking DH keys and parameters
References
SourceURLTags
openssl-security@openssl.orghttp://www.openwall.com/lists/oss-security/2023/07/19/4Mailing List, Third Party Advisory
openssl-security@openssl.orghttp://www.openwall.com/lists/oss-security/2023/07/19/5Mailing List, Third Party Advisory
openssl-security@openssl.orghttp://www.openwall.com/lists/oss-security/2023/07/19/6Mailing List, Third Party Advisory
openssl-security@openssl.orghttp://www.openwall.com/lists/oss-security/2023/07/31/1Mailing List, Third Party Advisory
openssl-security@openssl.orghttp://www.openwall.com/lists/oss-security/2024/05/16/1
openssl-security@openssl.orghttps://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=1fa20cf2f506113c761777127a38bce5068740ebMailing List, Patch, Vendor Advisory
openssl-security@openssl.orghttps://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=8780a896543a654e757db1b9396383f9d8095528Mailing List, Patch, Vendor Advisory
openssl-security@openssl.orghttps://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=9a0a4d3c1e7138915563c0df4fe6a3f9377b839cBroken Link, Vendor Advisory
openssl-security@openssl.orghttps://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=fc9867c1e03c22ebf56943be205202e576aabf23Mailing List, Patch, Vendor Advisory
openssl-security@openssl.orghttps://lists.debian.org/debian-lts-announce/2023/08/msg00019.htmlMailing List, Third Party Advisory
openssl-security@openssl.orghttps://security.gentoo.org/glsa/202402-08
openssl-security@openssl.orghttps://security.netapp.com/advisory/ntap-20230803-0011/Third Party Advisory
openssl-security@openssl.orghttps://www.openssl.org/news/secadv/20230719.txtVendor Advisory
Impacted products
VendorProduct
OpenSSLOpenSSL
Show details on NVD website

To clipboard 

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      "datePublic": "2023-07-13T00:00:00.000Z",
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              "value": "Issue summary: Checking excessively long DH keys or parameters may be very slow.\u003cbr\u003e\u003cbr\u003eImpact summary: Applications that use the functions DH_check(), DH_check_ex()\u003cbr\u003eor EVP_PKEY_param_check() to check a DH key or DH parameters may experience long\u003cbr\u003edelays. Where the key or parameters that are being checked have been obtained\u003cbr\u003efrom an untrusted source this may lead to a Denial of Service.\u003cbr\u003e\u003cbr\u003eThe function DH_check() performs various checks on DH parameters. One of those\u003cbr\u003echecks confirms that the modulus (\u0027p\u0027 parameter) is not too large. Trying to use\u003cbr\u003ea very large modulus is slow and OpenSSL will not normally use a modulus which\u003cbr\u003eis over 10,000 bits in length.\u003cbr\u003e\u003cbr\u003eHowever the DH_check() function checks numerous aspects of the key or parameters\u003cbr\u003ethat have been supplied. Some of those checks use the supplied modulus value\u003cbr\u003eeven if it has already been found to be too large.\u003cbr\u003e\u003cbr\u003eAn application that calls DH_check() and supplies a key or parameters obtained\u003cbr\u003efrom an untrusted source could be vulernable to a Denial of Service attack.\u003cbr\u003e\u003cbr\u003eThe function DH_check() is itself called by a number of other OpenSSL functions.\u003cbr\u003eAn application calling any of those other functions may similarly be affected.\u003cbr\u003eThe other functions affected by this are DH_check_ex() and\u003cbr\u003eEVP_PKEY_param_check().\u003cbr\u003e\u003cbr\u003eAlso vulnerable are the OpenSSL dhparam and pkeyparam command line applications\u003cbr\u003ewhen using the \u0027-check\u0027 option.\u003cbr\u003e\u003cbr\u003eThe OpenSSL SSL/TLS implementation is not affected by this issue.\u003cbr\u003e\u003cbr\u003eThe OpenSSL 3.0 and 3.1 FIPS providers are not affected by this issue."
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    "dateReserved": "2023-06-28T14:21:39.968Z",
    "dateUpdated": "2024-08-02T06:55:03.577Z",
    "state": "PUBLISHED"
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Trying to use\\na very large modulus is slow and OpenSSL will not normally use a modulus which\\nis over 10,000 bits in length.\\n\\nHowever the DH_check() function checks numerous aspects of the key or parameters\\nthat have been supplied. 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  }
}


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