CVE-2021-20231

A flaw was found in gnutls. A use after free issue in client sending key_share extension may lead to memory corruption and other consequences.

A flaw was found in gnutls. A use after free issue in client sending key_share extension may lead to memory corruption and other consequences.

A flaw was found in gnutls. A use after free issue in client sending key_share extension may lead to memory corruption and other consequences.

GnuTLS is a secure communications library implementing the SSL, TLS and DTLS protocols and technologies around them. It provides a simple C language application programming interface (API) to access the secure communications protocols as well as APIs to parse and write X.509, PKCS #12, and other required structures. The project strives to provide a secure communications back-end, simple to use and integrated with the rest of the base Linux libraries. A back-end designed to work and be secure out of the box, keeping the complexity of TLS and PKI out of application code.

Security Fix(es):

A flaw was found in gnutls. A use after free issue in client sending key_share extension may lead to memory corruption and other consequences.(CVE-2021-20231)

A flaw was found in gnutls. A use after free issue in client_send_params in lib/ext/pre_shared_key.c may lead to memory corruption and other potential consequences.(CVE-2021-20232)

The gnutls packages provide the GNU Transport Layer Security (GnuTLS) library, which implements cryptographic algorithms and protocols such as SSL, TLS, and DTLS.

Nettle is a cryptographic library that is designed to fit easily in almost any context: In crypto toolkits for object-oriented languages, such as C++, Python, or Pike, in applications like LSH or GNUPG, or even in kernel space.

The following packages have been upgraded to a later upstream version: gnutls (3.6.16). (BZ#1956783)

Security Fix(es):

• nettle: Remote crash in RSA decryption via manipulated ciphertext (CVE-2021-3580)

• gnutls: Use after free in client key_share extension (CVE-2021-20231)

• gnutls: Use after free in client_send_params in lib/ext/pre_shared_key.c (CVE-2021-20232)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Additional Changes:

For detailed information on changes in this release, see the Rocky Linux 8.5 Release Notes linked from the References section.

A flaw was found in gnutls. A use after free issue in client sending key_share extension may lead to memory corruption and other consequences.

The gnutls packages provide the GNU Transport Layer Security (GnuTLS) library, which implements cryptographic algorithms and protocols such as SSL, TLS, and DTLS.

Nettle is a cryptographic library that is designed to fit easily in almost any context: In crypto toolkits for object-oriented languages, such as C++, Python, or Pike, in applications like LSH or GNUPG, or even in kernel space.

The following packages have been upgraded to a later upstream version: gnutls (3.6.16). (BZ#1956783)

Security Fix(es):

• nettle: Remote crash in RSA decryption via manipulated ciphertext (CVE-2021-3580)

• gnutls: Use after free in client key_share extension (CVE-2021-20231)

• gnutls: Use after free in client_send_params in lib/ext/pre_shared_key.c (CVE-2021-20232)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Additional Changes:

For detailed information on changes in this release, see the AlmaLinux Release Notes linked from the References section.

A flaw was found in gnutls. A use after free issue in client sending key_share extension may lead to memory corruption and other consequences (CVE-2021-20231).

A flaw was found in gnutls. A use after free issue in client_send_params in lib/ext/pre_shared_key.c may lead to memory corruption and other potential consequences (CVE-2021-20232).

This update for gnutls fixes the following issues:

• CVE-2021-20232: Fixed a use after free issue which could have led to memory corruption and other potential consequences (bsc#1183456).
• CVE-2021-20231: Fixed a use after free issue which could have led to memory corruption and other potential consequences (bsc#1183457).

This update was imported from the SUSE:SLE-15-SP2:Update update project.

This update for gnutls fixes the following issues:

• CVE-2021-20232: Fixed a use after free issue which could have led to memory corruption and other potential consequences (bsc#1183456).
• CVE-2021-20231: Fixed a use after free issue which could have led to memory corruption and other potential consequences (bsc#1183457).

This update for gnutls fixes the following issues:

• CVE-2021-20232: Fixed a use after free issue which could have led to memory corruption and other potential consequences (bsc#1183456).
• CVE-2021-20231: Fixed a use after free issue which could have led to memory corruption and other potential consequences (bsc#1183457).

It was discovered that GnuTLS incorrectly handled sending certain extensions when being used as a client. A remote attacker could use this issue to cause GnuTLS to crash, resulting in a denial of service, or possibly execute arbitrary code.