OpenSSL lança patch para bug de alta gravidade que pode levar a ataques RCE

Os mantenedores do projeto OpenSSL lançaram patches para resolver um bug de alta gravidade na biblioteca criptográfica que poderia levar à execução remota de código em determinados cenários.

O problema, agora atribuído ao identificador CVE-2022-2274, foi descrito como um caso de corrupção de memória heap com operação de chave privada RSA que foi introduzida no OpenSSL versão 3.0.4 lançado em 21 de junho de 2022.

Lançado pela primeira vez em 1998, o OpenSSL é uma biblioteca de criptografia de uso geral que oferece implementação de código aberto dos protocolos Secure Sockets Layer (SSL) e Transport Layer Security (TLS), permitindo que os usuários gerem chaves privadas, criem solicitações de assinatura de certificados ( CSRs – Certificate Signing Request , instale certificados SSL/TLS.

“Servidores SSL/TLS ou outros servidores que usam chaves privadas RSA de 2048 bits executados em máquinas que suportam instruções AVX512IFMA da arquitetura X86_64 são afetados por esse problema”, observou o comunicado. OpenSSL Security Advisory [5 July 2022] |Heap memory corruption with RSA private key operation (CVE-2022-2274)

Chamando-o de “erro grave na implementação do RSA”, os mantenedores disseram que a falha pode levar à corrupção de memória durante a computação que pode ser armada por um invasor para desencadear a execução remota de código na máquina que executa a computação.

Xi Ruoyao, Ph.D. estudante da Xidian University, foi creditado por relatar a falha ao OpenSSL em 22 de junho de 2022. Recomenda-se que os usuários da biblioteca atualizem para o OpenSSL versão 3.0.5 para mitigar possíveis ameaças.

OpenSSL Security Advisory [5 July 2022]

Heap memory corruption with RSA private key operation (CVE-2022-2274)

Severity: High

The OpenSSL 3.0.4 release introduced a serious bug in the RSA
implementation for X86_64 CPUs supporting the AVX512IFMA instructions.
This issue makes the RSA implementation with 2048 bit private keys
incorrect on such machines and memory corruption will happen during
the computation. As a consequence of the memory corruption an attacker
may be able to trigger a remote code execution on the machine performing
the computation.

SSL/TLS servers or other servers using 2048 bit RSA private keys running
on machines supporting AVX512IFMA instructions of the X86_64 architecture
are affected by this issue.

Note that on a vulnerable machine, proper testing of OpenSSL would fail and
should be noticed before deployment.

Users of the OpenSSL 3.0.4 version should upgrade to OpenSSL 3.0.5.

OpenSSL 1.1.1 and 1.0.2 are not affected by this issue.

This issue was reported to OpenSSL on 22nd June 2022 by Xi Ruoyao. The
fix was developed by Xi Ruoyao.

References

URL for this Security Advisory:
https://www.openssl.org/news/secadv/20220705.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

AES OCB fails to encrypt some bytes (CVE-2022-2097)

Severity: MODERATE

AES OCB mode for 32-bit x86 platforms using the AES-NI assembly optimised
implementation will not encrypt the entirety of the data under some
circumstances. This could reveal sixteen bytes of data that was
preexisting in the memory that wasn’t written. In the special case of
“in place” encryption, sixteen bytes of the plaintext would be revealed.

Since OpenSSL does not support OCB based cipher suites for TLS and DTLS,
they are both unaffected.

This issue affects versions 1.1.1 and 3.0. It was addressed in the
releases of 1.1.1q and 3.0.5 on the 5th July 2022.

OpenSSL 1.1.1 users should upgrade to 1.1.1q
OpenSSL 3.0 users should upgrade to 3.0.5

This issue was reported to OpenSSL on the 15th June 2022 by Alex
Chernyakhovsky from Google. The fix was developed by Alex Chernyakhovsky,
David Benjamin and Alejandro Sedeño from Google.

Fonte: THN