Medium: openssl

Issue Overview:

A microprocessor side-channel vulnerability was found on SMT (e.g, Hyper-Threading) architectures. An attacker running a malicious process on the same core of the processor as the victim process can extract certain secret information.(CVE-2018-5407)

If an application encounters a fatal protocol error and then calls SSL_shutdown() twice (once to send a close_notify, and once to receive one) then OpenSSL can respond differently to the calling application if a 0 byte record is received with invalid padding compared to if a 0 byte record is received with an invalid MAC. If the application then behaves differently based on that in a way that is detectable to the remote peer, then this amounts to a padding oracle that could be used to decrypt data. In order for this to be exploitable “non-stitched” ciphersuites must be in use. Stitched ciphersuites are optimised implementations of certain commonly used ciphersuites. Also the application must call SSL_shutdown() twice even if a protocol error has occurred (applications should not do this but some do anyway).(CVE-2019-1559)

Affected Packages:

openssl

Note:

This advisory is applicable to Amazon Linux 2 (AL2) Core repository. Visit this FAQ section for the difference between AL2 Core and AL2 Extras advisories.

Issue Correction:
Run yum update openssl to update your system.

New Packages:

aarch64:  
    openssl-1.0.2k-16.amzn2.1.1.aarch64  
    openssl-libs-1.0.2k-16.amzn2.1.1.aarch64  
    openssl-devel-1.0.2k-16.amzn2.1.1.aarch64  
    openssl-static-1.0.2k-16.amzn2.1.1.aarch64  
    openssl-perl-1.0.2k-16.amzn2.1.1.aarch64  
    openssl-debuginfo-1.0.2k-16.amzn2.1.1.aarch64  
  
i686:  
    openssl-1.0.2k-16.amzn2.1.1.i686  
    openssl-libs-1.0.2k-16.amzn2.1.1.i686  
    openssl-devel-1.0.2k-16.amzn2.1.1.i686  
    openssl-static-1.0.2k-16.amzn2.1.1.i686  
    openssl-perl-1.0.2k-16.amzn2.1.1.i686  
    openssl-debuginfo-1.0.2k-16.amzn2.1.1.i686  
  
src:  
    openssl-1.0.2k-16.amzn2.1.1.src  
  
x86_64:  
    openssl-1.0.2k-16.amzn2.1.1.x86_64  
    openssl-libs-1.0.2k-16.amzn2.1.1.x86_64  
    openssl-devel-1.0.2k-16.amzn2.1.1.x86_64  
    openssl-static-1.0.2k-16.amzn2.1.1.x86_64  
    openssl-perl-1.0.2k-16.amzn2.1.1.x86_64  
    openssl-debuginfo-1.0.2k-16.amzn2.1.1.x86_64  

Additional References

Red Hat: CVE-2018-5407, CVE-2019-1559

Mitre: CVE-2018-5407, CVE-2019-1559