Medium: openssl

Issue Overview:

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). Fixed in OpenSSL 1.0.2r (Affected 1.0.2-1.0.2q). (CVE-2019-1559)

The OpenSSL DSA signature algorithm has been shown to be vulnerable to a timing side channel attack. An attacker could use variations in the signing algorithm to recover the private key. Fixed in OpenSSL 1.1.1a (Affected 1.1.1). Fixed in OpenSSL 1.1.0j (Affected 1.1.0-1.1.0i). Fixed in OpenSSL 1.0.2q (Affected 1.0.2-1.0.2p). (CVE-2018-0734)

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-19.amzn2.0.1.aarch64  
    openssl-libs-1.0.2k-19.amzn2.0.1.aarch64  
    openssl-devel-1.0.2k-19.amzn2.0.1.aarch64  
    openssl-static-1.0.2k-19.amzn2.0.1.aarch64  
    openssl-perl-1.0.2k-19.amzn2.0.1.aarch64  
    openssl-debuginfo-1.0.2k-19.amzn2.0.1.aarch64  
  
i686:  
    openssl-1.0.2k-19.amzn2.0.1.i686  
    openssl-libs-1.0.2k-19.amzn2.0.1.i686  
    openssl-devel-1.0.2k-19.amzn2.0.1.i686  
    openssl-static-1.0.2k-19.amzn2.0.1.i686  
    openssl-perl-1.0.2k-19.amzn2.0.1.i686  
    openssl-debuginfo-1.0.2k-19.amzn2.0.1.i686  
  
src:  
    openssl-1.0.2k-19.amzn2.0.1.src  
  
x86_64:  
    openssl-1.0.2k-19.amzn2.0.1.x86_64  
    openssl-libs-1.0.2k-19.amzn2.0.1.x86_64  
    openssl-devel-1.0.2k-19.amzn2.0.1.x86_64  
    openssl-static-1.0.2k-19.amzn2.0.1.x86_64  
    openssl-perl-1.0.2k-19.amzn2.0.1.x86_64  
    openssl-debuginfo-1.0.2k-19.amzn2.0.1.x86_64  

Additional References

Red Hat: CVE-2018-0734, CVE-2019-1559

Mitre: CVE-2018-0734, CVE-2019-1559