CVE-2020-24659

An issue was discovered in GnuTLS before 3.6.15. A server can trigger a NULL pointer dereference in a TLS 1.3 client if a no_renegotiation alert is sent with unexpected timing, and then an invalid second handshake occurs. The crash happens in the application's error handling path, where the gnutls_deinit function is called after detecting a handshake failure.

An issue was discovered in GnuTLS before 3.6.15. A server can trigger a NULL pointer dereference in a TLS 1.3 client if a no_renegotiation alert is sent with unexpected timing, and then an invalid second handshake occurs. The crash happens in the application's error handling path, where the gnutls_deinit function is called after detecting a handshake failure.

An issue was discovered in GnuTLS before 3.6.15. A server can trigger a NULL pointer dereference in a TLS 1.3 client if a no_renegotiation alert is sent with unexpected timing, and then an invalid second handshake occurs. The crash happens in the application's error handling path, where the gnutls_deinit function is called after detecting a handshake failure.

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.

Security Fix(es):

An issue was discovered in GnuTLS before 3.6.15. A server can trigger a NULL pointer dereference in a TLS 1.3 client if a no_renegotiation alert is sent with unexpected timing, and then an invalid second handshake occurs. The crash happens in the application's error handling path, where the gnutls_deinit function is called after detecting a handshake failure.(CVE-2020-24659)

An issue was discovered in GnuTLS before 3.6.15. A server can trigger a NULL pointer dereference in a TLS 1.3 client if a no_renegotiation alert is sent with unexpected timing, and then an invalid second handshake occurs. The crash happens in the application's error handling path, where the gnutls_deinit function is called after detecting a handshake failure.

An issue was discovered in GnuTLS before 3.6.15. A server can trigger a NULL pointer dereference in a TLS 1.3 client if a no_renegotiation alert is sent with unexpected timing, and then an invalid second handshake occurs. The crash happens in the application's error handling path, where the gnutls_deinit function is called after detecting a handshake failure (CVE-2020-24659).

This update for gnutls fixes the following issues:

• Fix heap buffer overflow in handshake with no_renegotiation alert sent (CVE-2020-24659 bsc#1176181)
• FIPS: Implement (EC)DH requirements from SP800-56Arev3 (bsc#1176086)
• FIPS: Use 2048 bit prime in DH selftest (bsc#1176086)
• FIPS: Add TLS KDF selftest (bsc#1176671)

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

This update for gnutls fixes the following issues:

• Fix heap buffer overflow in handshake with no_renegotiation alert sent (CVE-2020-24659 bsc#1176181)
• FIPS: Implement (EC)DH requirements from SP800-56Arev3 (bsc#1176086)
• FIPS: Use 2048 bit prime in DH selftest (bsc#1176086)
• FIPS: Add TLS KDF selftest (bsc#1176671)

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

This update for gnutls fixes the following issues:

• Fix heap buffer overflow in handshake with no_renegotiation alert sent (CVE-2020-24659 bsc#1176181)
• FIPS: Implement (EC)DH requirements from SP800-56Arev3 (bsc#1176086)
• FIPS: Use 2048 bit prime in DH selftest (bsc#1176086)
• FIPS: Add TLS KDF selftest (bsc#1176671)

This update for gnutls fixes the following issues:

• Fix heap buffer overflow in handshake with no_renegotiation alert sent (CVE-2020-24659 bsc#1176181)
• FIPS: Implement (EC)DH requirements from SP800-56Arev3 (bsc#1176086)
• FIPS: Use 2048 bit prime in DH selftest (bsc#1176086)
• FIPS: Add TLS KDF selftest (bsc#1176671)

This update for gnutls fixes the following issues:

• Fix heap buffer overflow in handshake with no_renegotiation alert sent (CVE-2020-24659 bsc#1176181)
• FIPS: Implement (EC)DH requirements from SP800-56Arev3 (bsc#1176086)
• FIPS: Use 2048 bit prime in DH selftest (bsc#1176086)
• FIPS: Add TLS KDF selftest (bsc#1176671)

It was discovered that GnuTLS incorrectly handled certain alerts when being used with TLS 1.3 servers. A remote attacker could use this issue to cause GnuTLS to crash, resulting in a denial of service, or possibly execute arbitrary code.