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@philyuchkoff philyuchkoff released this 05 Jun 13:08
· 14 commits to master since this release
3.3.1
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OpenSSL 3.3.1 is now available, including bug and security fixes: please download and upgrade!

Changes between 3.3.0 and 3.3.1 [4 Jun 2024]

  • Fixed potential use after free after SSL_free_buffers() is called.

The SSL_free_buffers function is used to free the internal OpenSSL buffer used when processing an incoming record from the network. The call is only expected to succeed if the buffer is not currently in use. However, two scenarios have been identified where the buffer is freed even when still in use.

The first scenario occurs where a record header has been received from the network and processed by OpenSSL, but the full record body has not yet arrived. In this case calling SSL_free_buffers will succeed even though a record has only been partially processed and the buffer is still in use.

The second scenario occurs where a full record containing application data has been received and processed by OpenSSL but the application has only read part of this data. Again a call to SSL_free_buffers will succeed even though the buffer is still in use. ([CVE-2024-4741])

Matt Caswell

  • Fixed an issue where checking excessively long DSA keys or parameters may be very slow.

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.

To resolve this issue DSA keys larger than OPENSSL_DSA_MAX_MODULUS_BITS will now fail the check immediately with a DSA_R_MODULUS_TOO_LARGE error reason. ([CVE-2024-4603])

Tomáš Mráz

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