-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 OpenSSL Security Advisory [16th May 2024] =========================================
Excessive time spent checking DSA keys and parameters (CVE-2024-4603) ===================================================================== Severity: Low Issue summary: Checking excessively long DSA keys or parameters may be very slow. Impact summary: Applications that use the functions EVP_PKEY_param_check() or EVP_PKEY_public_check() to check a DSA public key or DSA parameters may experience long delays. Where the key or parameters that are being checked have been obtained from an untrusted source this may lead to a Denial of Service. The functions EVP_PKEY_param_check() or EVP_PKEY_public_check() perform various checks on DSA parameters. Some of those computations take a long time if the modulus ("p" parameter) is too large. Trying to use a very large modulus is slow and OpenSSL will not allow using public keys with a modulus which is over 10,000 bits in length for signature verification. However the key and parameter check functions do not limit the modulus size when performing the checks. An application that calls EVP_PKEY_param_check() or EVP_PKEY_public_check() and supplies a key or parameters obtained from an untrusted source could be vulnerable to a Denial of Service attack. These functions are not called by OpenSSL itself on untrusted DSA keys so only applications that directly call these functions may be vulnerable. Also vulnerable are the OpenSSL pkey and pkeyparam command line applications when using the "-check" option. The OpenSSL SSL/TLS implementation is not affected by this issue. The OpenSSL 3.0 and 3.1 FIPS providers are affected by this issue. OpenSSL 3.3, 3.2, 3.1 and 3.0 are vulnerable to this issue. OpenSSL 1.1.1 and 1.0.2 are not affected by this issue. Due to the low severity of this issue we are not issuing new releases of OpenSSL at this time. The fix will be included in the next releases when they become available. The fix is also available in commit 53ea0648 (for 3.3), commit da343d06 (for 3.2), commit 9c39b385 (for 3.1) and commit 3559e868 (for 3.0) in the OpenSSL git repository. OSSfuzz first detected and automatically reported this issue on 13th February 2024 using a fuzzer recently added to OpenSSL written by Kurt Roeckx. The fix was developed by Tomas Mraz. General Advisory Notes ====================== URL for this Security Advisory: https://www.openssl.org/news/secadv/20240516.txt Note: the online version of the advisory may be updated with additional details over time. For details of OpenSSL severity classifications please see: https://www.openssl.org/policies/secpolicy.html -----BEGIN PGP SIGNATURE----- iQIzBAEBCAAdFiEE3HAyZir4heL0fyQ/UnRmohynnm0FAmZGLbUACgkQUnRmohyn nm27iRAAkvc/HNdfAY3l6kBJ2GVUbvPLODxFhzpei5DW1JxUojQwPXe3cXZlBs9D PDtw85WX4IPULvcrq7BeGxOs4hDR1xkUfzr/5b0t7a9olFy1oYE/and0qpQx3AzP eS7O9b001ssXtAs43aO6S4H0L5+3lRXPnLhyDfeh4odty4fbSIP8apLXtmaTKt6P hdm+JLJdrx92aKjraKBcc1YKl2HgCBNRsxBnimKJzZGZVokUZsF0mIZ/G1SZVs0J W4usEF1JuRD2vAUWcSDU92tZd0Bkz55SjVC7NVPqvqSUAo04f3LhZj1c7rMjSD5p zjbG6c4PiCC08LRCHRtZUu56Kp1tBYy+X7zZrzDiPF1R/TY9pYYA1JKS6EvbBb/d 8IB3cxeeTzW0StnuxKmOchrMsGJtizh9hGIhy7yzjbQ8oMkhcRsUlbZDQwiHvCUk qgXP2v0pnqBmVEBfqCBvUOKAy19XMVOUH69JBsuMEPIKzx2k7Y5QvVKZNq3DtboA lOc0zkfLbtXrNZFDUDqpq2megmVbVlTw619NQE51jN/LPzo7b+fdw1cHTTnQE2Gt rSQYZnklb0fmfQQJOl4HpCK16SfVebPYU4hRDJ1Yqk6jcClFbit1F7Fz6Ypjv4nM iTOJAAoat2jQhmqg2VTpuUQGjRMAADvKlpABL4dTYCvJv6RMXTk= =Efz1 -----END PGP SIGNATURE-----