CVE-2024-0553

A vulnerability was found in GnuTLS. The response times to malformed ciphertexts in RSA-PSK ClientKeyExchange differ from the response times of ciphertexts with correct PKCS#1 v1.5 padding. This issue may allow a remote attacker to perform a timing side-channel attack in the RSA-PSK key exchange, potentially leading to the leakage of sensitive data. CVE-2024-0553 is designated as an incomplete resolution for CVE-2023-5981.

A vulnerability was found in GnuTLS. The response times to malformed ciphertexts in RSA-PSK ClientKeyExchange differ from the response times of ciphertexts with correct PKCS#1 v1.5 padding. This issue may allow a remote attacker to perform a timing side-channel attack in the RSA-PSK key exchange, potentially leading to the leakage of sensitive data. CVE-2024-0553 is designated as an incomplete resolution for CVE-2023-5981.

A vulnerability was found in GnuTLS. The response times to malformed ciphertexts in RSA-PSK ClientKeyExchange differ from the response times of ciphertexts with correct PKCS#1 v1.5 padding. This issue may allow a remote attacker to perform a timing side-channel attack in the RSA-PSK key exchange, potentially leading to the leakage of sensitive data. CVE-2024-0553 is designated as an incomplete resolution for CVE-2023-5981.

A vulnerability was found in GnuTLS. The response times to malformed ciphertexts in RSA-PSK ClientKeyExchange differ from the response times of ciphertexts with correct PKCS#1 v1.5 padding. This issue may allow a remote attacker to perform a timing side-channel attack in the RSA-PSK key exchange, potentially leading to the leakage of sensitive data. CVE-2024-0553 is designated as an incomplete resolution for CVE-2023-5981.

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 vulnerability was found in GnuTLS. The response times to malformed ciphertexts in RSA-PSK ClientKeyExchange differ from response times of ciphertexts with correct PKCS#1 v1.5 padding. This issue may allow a remote attacker to perform a timing side-channel attack in the RSA-PSK key exchange, potentially leading to the leakage of sensitive data. CVE-2024-0553 is designated as an incomplete resolution for CVE-2023-5981.(CVE-2024-0553)

A vulnerability was found in GnuTLS, where a cockpit (which uses gnuTLS) rejects a certificate chain with distributed trust. This issue occurs when validating a certificate chain with cockpit-certificate-ensure. This flaw allows an unauthenticated, remote client or attacker to initiate a denial of service attack.(CVE-2024-0567)

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 vulnerability was found in GnuTLS. The response times to malformed ciphertexts in RSA-PSK ClientKeyExchange differ from response times of ciphertexts with correct PKCS#1 v1.5 padding. This issue may allow a remote attacker to perform a timing side-channel attack in the RSA-PSK key exchange, potentially leading to the leakage of sensitive data. CVE-2024-0553 is designated as an incomplete resolution for CVE-2023-5981.(CVE-2024-0553)

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 vulnerability was found in GnuTLS. The response times to malformed ciphertexts in RSA-PSK ClientKeyExchange differ from response times of ciphertexts with correct PKCS#1 v1.5 padding. This issue may allow a remote attacker to perform a timing side-channel attack in the RSA-PSK key exchange, potentially leading to the leakage of sensitive data. CVE-2024-0553 is designated as an incomplete resolution for CVE-2023-5981.(CVE-2024-0553)

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 vulnerability was found in GnuTLS. The response times to malformed ciphertexts in RSA-PSK ClientKeyExchange differ from response times of ciphertexts with correct PKCS#1 v1.5 padding. This issue may allow a remote attacker to perform a timing side-channel attack in the RSA-PSK key exchange, potentially leading to the leakage of sensitive data. CVE-2024-0553 is designated as an incomplete resolution for CVE-2023-5981.(CVE-2024-0553)

A vulnerability was found in GnuTLS, where a cockpit (which uses gnuTLS) rejects a certificate chain with distributed trust. This issue occurs when validating a certificate chain with cockpit-certificate-ensure. This flaw allows an unauthenticated, remote client or attacker to initiate a denial of service attack.(CVE-2024-0567)

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 vulnerability was found in GnuTLS. The response times to malformed ciphertexts in RSA-PSK ClientKeyExchange differ from response times of ciphertexts with correct PKCS#1 v1.5 padding. This issue may allow a remote attacker to perform a timing side-channel attack in the RSA-PSK key exchange, potentially leading to the leakage of sensitive data. CVE-2024-0553 is designated as an incomplete resolution for CVE-2023-5981.(CVE-2024-0553)

A vulnerability was found in GnuTLS, where a cockpit (which uses gnuTLS) rejects a certificate chain with distributed trust. This issue occurs when validating a certificate chain with cockpit-certificate-ensure. This flaw allows an unauthenticated, remote client or attacker to initiate a denial of service attack.(CVE-2024-0567)

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 vulnerability was found in GnuTLS. The response times to malformed ciphertexts in RSA-PSK ClientKeyExchange differ from response times of ciphertexts with correct PKCS#1 v1.5 padding. This issue may allow a remote attacker to perform a timing side-channel attack in the RSA-PSK key exchange, potentially leading to the leakage of sensitive data. CVE-2024-0553 is designated as an incomplete resolution for CVE-2023-5981.(CVE-2024-0553)

A vulnerability was found in GnuTLS, where a cockpit (which uses gnuTLS) rejects a certificate chain with distributed trust. This issue occurs when validating a certificate chain with cockpit-certificate-ensure. This flaw allows an unauthenticated, remote client or attacker to initiate a denial of service attack.(CVE-2024-0567)

A vulnerability was found in GnuTLS. The response times to malformed ciphertexts in RSA-PSK ClientKeyExchange differ from the response times of ciphertexts with correct PKCS#1 v1.5 padding. This issue may allow a remote attacker to perform a timing side-channel attack in the RSA-PSK key exchange, potentially leading to the leakage of sensitive data. CVE-2024-0553 is designated as an incomplete resolution for CVE-2023-5981.

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

Security Fix(es):

• gnutls: timing side-channel in the RSA-PSK authentication (CVE-2023-5981)
• gnutls: incomplete fix for CVE-2023-5981 (CVE-2024-0553)
• gnutls: rejects certificate chain with distributed trust (CVE-2024-0567)

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.

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

Security Fix(es):

• gnutls: incomplete fix for CVE-2023-5981 (CVE-2024-0553)

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.

• Add CVE-2024-0567 PoC test
• Remove src.rpm from sources
• CVE-2023-5981: removes branching that depends on secret data to prevent potential side-channel attack
• CVE-2024-0553: minimize branching after decryption

• Add CVE-2024-0567 PoC test
• Remove src.rpm from sources
• CVE-2023-5981: removes branching that depends on secret data to prevent potential side-channel attack
• CVE-2024-0553: minimize branching after decryption

• CVE-2023-5981, CVE-2024-0553: fix timing sidechannel in RSA-PSK key exchange

• Keep the broken pkcs11 tests disabled.
• Added CVE-2024-0567 PoC test.
• CVE-2023-5981-pre1: improve level of randomness for each operations, always use _gnutls_switch_lib_state for pk wrappers.
• CVE-2023-5981-pre2: add constant time/cache operations to prevent or minimaze timining or cache side channel attacks.
• CVE-2023-5981: removes branching that depends on secret data to prevent potential side-channel attack.
• CVE-2024-0553: minimize branching after decryption.

• Keep the broken pkcs11 tests disabled.
• Added CVE-2024-0567 PoC test.
• CVE-2023-5981-pre1: improve level of randomness for each operations, always use _gnutls_switch_lib_state for pk wrappers.
• CVE-2023-5981-pre2: add constant time/cache operations to prevent or minimaze timining or cache side channel attacks.
• CVE-2023-5981: removes branching that depends on secret data to prevent potential side-channel attack.
• CVE-2024-0553: minimize branching after decryption.

• Keep the broken pkcs11 tests disabled.
• Added CVE-2024-0567 PoC test.
• CVE-2023-5981-pre1: improve level of randomness for each operations, always use _gnutls_switch_lib_state for pk wrappers.
• CVE-2023-5981-pre2: add constant time/cache operations to prevent or minimaze timining or cache side channel attacks.
• CVE-2023-5981: removes branching that depends on secret data to prevent potential side-channel attack.
• CVE-2024-0553: minimize branching after decryption.

• SECURITY UPDATE: timing side-channel in RSA-PSK ClientKeyExchange
  • debian/patches/CVE-2023-5981-pre1.patch: use the appropriate level of randomness for each nettle operation and fail through the library state instead of abort(), in lib/nettle/pk.c, lib/fips.h, lib/includes/gnutls/crypto.h.
  • debian/patches/CVE-2023-5981-pre2.patch: add the side-channel silent gnutls_privkey_decrypt_data2() on top of nettle rsa_sec_decrypt(), in lib/gnutls_privkey.c, lib/nettle/pk.c, lib/pkcs11_privkey.c, configure.ac and related headers, with selftest and test.
  • debian/patches/CVE-2023-5981.patch: use the new function in the RSA-PSK server without branching on the decryption result, in lib/auth/rsa_psk.c.
  • debian/libgnutls30.symbols: add gnutls_privkey_decrypt_data2.
  • debian/control: build-depend on nettle-dev with rsa_sec_decrypt.
  • CVE-2023-5981
• SECURITY UPDATE: incomplete fix for CVE-2023-5981
  • debian/patches/CVE-2024-0553.patch: move the PSK lookup and key setup before the decryption, in lib/auth/rsa_psk.c.
  • debian/patches/CVE-2026-5260-decrypt_data2.patch: reject a ciphertext that does not match the modulus size and size the PKCS#11 buffer for the plaintext, in lib/auth/rsa_psk.c and lib/pkcs11_privkey.c.
  • CVE-2024-0553

The updated packages fix security vulnerabilities: A vulnerability was found in GnuTLS, where a cockpit (which uses gnuTLS) rejects a certificate chain with distributed trust. This issue occurs when validating a certificate chain with cockpit-certificate-ensure. This flaw allows an unauthenticated, remote client or attacker to initiate a denial of service attack. (CVE-2024-0567) A vulnerability was found in GnuTLS. The response times to malformed ciphertexts in RSA-PSK ClientKeyExchange differ from response times of ciphertexts with correct PKCS#1 v1.5 padding. This issue may allow a remote attacker to perform a timing side-channel attack in the RSA-PSK key exchange, potentially leading to the leakage of sensitive data. CVE-2024-0553 is designated as an incomplete resolution for CVE-2023-5981. (CVE-2024-0553)

These are all security issues fixed in the gnutls-3.8.3-1.1 package on the GA media of openSUSE Tumbleweed.

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

Security Fix(es):

• gnutls: incomplete fix for CVE-2023-5981 (CVE-2024-0553)

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.

This update for gnutls fixes the following issues:

• CVE-2024-0567: Fixed an incorrect rejection of certificate chains with distributed trust (bsc#1218862).
• CVE-2024-0553: Fixed a timing attack against the RSA-PSK key exchange, which could lead to the leakage of sensitive data (bsc#1218865).

This update for gnutls fixes the following issues:

• CVE-2024-0567: Fixed an incorrect rejection of certificate chains with distributed trust (bsc#1218862).
• CVE-2024-0553: Fixed a timing attack against the RSA-PSK key exchange, which could lead to the leakage of sensitive data (bsc#1218865).

This update for gnutls fixes the following issues:

• CVE-2024-0553: Fixed insufficient mitigation for side channel attack in RSA-PSK, aka CVE-2023-5981 (bsc#1218865).

This update for gnutls fixes the following issues:

Security issues fixed:

• CVE-2023-0361: Fixed a Bleichenbacher oracle in the TLS RSA key exchange (bsc#1208143).
• CVE-2023-5981: Fixed timing side-channel inside RSA-PSK key exchange (bsc#1217277).
• CVE-2024-0567: Fixed an incorrect rejection of certificate chains with distributed trust (bsc#1218862).
• CVE-2024-0553: Fixed a timing attack against the RSA-PSK key exchange, which could lead to the leakage of sensitive data (bsc#1218865).

FIPS 140-3 certification related bugs fixed:

• FIPS: Set error state when jent init failed in FIPS mode (bsc#1202146)

• FIPS: Make XTS key check failure not fatal (bsc#1203779)

• FIPS: Added GnuTLS DH/ECDH pairwise consistency check for public key regeneration [bsc#1207183]

• FIPS: Change all the 140-2 references to FIPS 140-3 in order to account for the new FIPS certification [bsc#1207346]

• FIPS: Make the jitterentropy calls thread-safe (bsc#1208146).

• FIPS: GnuTLS DH/ECDH PCT public key regeneration (bsc#1207183).

• FIPS: Fix pct_test() return code in case of error (bsc#1207183)

• FIPS: Establish PBKDF2 additional requirements [bsc#1209001]

  • Set the minimum output key length to 112 bits (FIPS 140-3 IG D.N)
  • Set the minimum salt length to 128 bits (SP 800-132 sec. 5.1)
  • Set the minimum iterations count to 1000 (SP 800-132 sec 5.2)
  • Set the minimum passlen of 20 characters (SP SP800-132 sec 5)
  • Add regression tests for the new PBKDF2 requirements.

Other issues fixed:

• Fix AVX CPU feature detection for OSXSAVE (bsc#1203299) This fixes a SIGILL termination at the verzoupper instruction when trying to run GnuTLS on a Linux kernel with the noxsave command line parameter set. Relevant mostly for virtual systems.
• Increase the limit of TLS PSK usernames from 128 to 65535 characters. [bsc#1208237, jsc#PED-1562]

It was discovered that GnuTLS had a timing side-channel when processing malformed ciphertexts in RSA-PSK ClientKeyExchange. A remote attacker could possibly use this issue to recover sensitive information. (CVE-2024-0553)

It was discovered that GnuTLS incorrectly handled certain certificate chains with a cross-signing loop. A remote attacker could possibly use this issue to cause GnuTLS to crash, resulting in a denial of service. This issue only affected Ubuntu 22.04 LTS, Ubuntu 23.04, and Ubuntu 23.10. (CVE-2024-0567)

It was discovered that GnuTLS had a timing side-channel when processing malformed ciphertexts in RSA-PSK ClientKeyExchange. A remote attacker could possibly use this issue to recover sensitive information. This issue only affected Ubuntu 18.04 LTS. (CVE-2024-0553)

Bing Shi discovered that GnuTLS incorrectly handled decoding certain DER-encoded certificates. A remote attacker could possibly use this issue to cause GnuTLS to consume resources, leading to a denial of service. This issue only affected Ubuntu 18.04 LTS. (CVE-2024-12243)

Luigino Camastra discovered that GnuTLS incorrectly handled certain PKCS11 token labels. A remote attacker could use this issue to cause GnuTLS to crash, resulting in a denial of service, or possibly execute arbitrary code. The default compiler options for affected releases should reduce the vulnerability to a denial of service. (CVE-2025-9820)

Tim Scheckenbach discovered that GnuTLS incorrectly handled malicious certificates containing a large number of name constraints and subject alternative names. A remote attacker could possibly use this issue to cause GnuTLS to consume resources, resulting in a denial of service. This issue only affected Ubuntu 18.04 LTS and Ubuntu 20.04 LTS. (CVE-2025-14831)

Oleh Konko and Joshua Rogers discovered that GnuTLS did not properly handle case-insensitive name constraints in certain cases. A remote attacker could possibly use this issue to bypass certificate validation, leading to a machine-in-the-middle attack. (CVE-2026-3833)

Joshua Rogers discovered that GnuTLS did not properly handle very short premaster secrets in certain RSA key exchange cases with PKCS#11-backed server keys. A remote attacker could possibly use this issue to obtain sensitive information. This issue only affected Ubuntu 18.04 LTS and Ubuntu 20.04 LTS. (CVE-2026-5260)

Joshua Rogers discovered that GnuTLS did not properly handle malformed DTLS handshake fragments in certain cases. A remote attacker could possibly use this issue to obtain sensitive information, or cause a denial of service. This issue only affected Ubuntu 20.04 LTS. (CVE-2026-33845)

Haruto Kimura, Oscar Reparaz, and Zou Dikai discovered that GnuTLS did not properly validate DTLS handshake fragment lengths in certain cases. A remote attacker could possibly use this issue to cause GnuTLS to crash, resulting in a denial of service, or execute arbitrary code. (CVE-2026-33846)

Joshua Rogers discovered that GnuTLS did not properly order DTLS packets with duplicate sequence numbers in certain cases. A remote attacker could possibly use this issue to cause GnuTLS to crash, resulting in a denial of service. (CVE-2026-42009)

Joshua Rogers discovered that GnuTLS did not properly handle usernames containing NUL characters in certain RSA-PSK configurations. A remote attacker could possibly use this issue to bypass authentication and gain unintended access to services. This issue only affected Ubuntu 20.04 LTS. (CVE-2026-42010)