Medium: vsftpd

Issue Overview:

ALPACA is an application layer protocol content confusion attack, exploiting TLS servers implementing different protocols but using compatible certificates, such as multi-domain or wildcard certificates. A MiTM attacker having access to victim’s traffic at the TCP/IP layer can redirect traffic from one subdomain to another, resulting in a valid TLS session. This breaks the authentication of TLS and cross-protocol attacks may be possible where the behavior of one protocol service may compromise the other at the application layer. (CVE-2021-3618)

Affected Packages:

vsftpd

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 vsftpd to update your system.

New Packages:

aarch64:  
    vsftpd-3.0.2-25.amzn2.0.1.aarch64  
    vsftpd-sysvinit-3.0.2-25.amzn2.0.1.aarch64  
    vsftpd-debuginfo-3.0.2-25.amzn2.0.1.aarch64  
  
i686:  
    vsftpd-3.0.2-25.amzn2.0.1.i686  
    vsftpd-sysvinit-3.0.2-25.amzn2.0.1.i686  
    vsftpd-debuginfo-3.0.2-25.amzn2.0.1.i686  
  
src:  
    vsftpd-3.0.2-25.amzn2.0.1.src  
  
x86_64:  
    vsftpd-3.0.2-25.amzn2.0.1.x86_64  
    vsftpd-sysvinit-3.0.2-25.amzn2.0.1.x86_64  
    vsftpd-debuginfo-3.0.2-25.amzn2.0.1.x86_64  

Additional References

Red Hat: CVE-2021-3618

Mitre: CVE-2021-3618