cve-2023-2975
Vulnerability from cvelistv5
Published
2023-07-14 11:16
Modified
2024-10-14 14:55
Severity ?
Summary
AES-SIV implementation ignores empty associated data entries
Impacted products
Vendor Product Version
Show details on NVD website


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            "url": "https://security.gentoo.org/glsa/202402-08"
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          "product": "OpenSSL",
          "vendor": "OpenSSL",
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          "type": "remediation developer",
          "user": "00000000-0000-4000-9000-000000000000",
          "value": "Tomas Mraz"
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              "value": "Issue summary: The AES-SIV cipher implementation contains a bug that causes\u003cbr\u003eit to ignore empty associated data entries which are unauthenticated as\u003cbr\u003ea consequence.\u003cbr\u003e\u003cbr\u003eImpact summary: Applications that use the AES-SIV algorithm and want to\u003cbr\u003eauthenticate empty data entries as associated data can be misled by removing,\u003cbr\u003eadding or reordering such empty entries as these are ignored by the OpenSSL\u003cbr\u003eimplementation. We are currently unaware of any such applications.\u003cbr\u003e\u003cbr\u003eThe AES-SIV algorithm allows for authentication of multiple associated\u003cbr\u003edata entries along with the encryption. To authenticate empty data the\u003cbr\u003eapplication has to call EVP_EncryptUpdate() (or EVP_CipherUpdate()) with\u003cbr\u003eNULL pointer as the output buffer and 0 as the input buffer length.\u003cbr\u003eThe AES-SIV implementation in OpenSSL just returns success for such a call\u003cbr\u003einstead of performing the associated data authentication operation.\u003cbr\u003eThe empty data thus will not be authenticated.\u003cbr\u003e\u003cbr\u003eAs this issue does not affect non-empty associated data authentication and\u003cbr\u003ewe expect it to be rare for an application to use empty associated data\u003cbr\u003eentries this is qualified as Low severity issue."
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    "dateReserved": "2023-05-30T10:29:34.539Z",
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