Important: rssh

Issue Overview:

Insufficient sanitation of environment variables passed to rsync can bypass the restrictions imposed by rssh, a restricted shell that should restrict users to perform only rsync operations, resulting in the execution of arbitrary shell commands. (CVE-2019-3464)

Insufficient sanitation of arguments passed to rsync can bypass the restrictions imposed by rssh, a restricted shell that should restrict users to perform only rsync operations, resulting in the execution of arbitrary shell commands. (CVE-2019-3463)

rssh version 2.3.4 contains a CWE-77: Improper Neutralization of Special Elements used in a Command (‘Command Injection’) vulnerability in ‘allowscp’ permission that can result in Local command execution. This attack appear to be exploitable via An authorized SSH user with the ‘allowscp’ permission. (CVE-2019-1000018)

Affected Packages:

rssh

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

New Packages:

i686:  
    rssh-2.3.4-15.3.amzn1.i686  
    rssh-debuginfo-2.3.4-15.3.amzn1.i686  
  
src:  
    rssh-2.3.4-15.3.amzn1.src  
  
x86_64:  
    rssh-debuginfo-2.3.4-15.3.amzn1.x86_64  
    rssh-2.3.4-15.3.amzn1.x86_64  

Additional References

Red Hat: CVE-2019-1000018, CVE-2019-3463, CVE-2019-3464

Mitre: CVE-2019-1000018, CVE-2019-3463, CVE-2019-3464