Important: squid

Issue Overview:

A flaw was found in squid. Due to incorrect data validation, a HTTP Request Smuggling attack against HTTP and HTTPS traffic is possible leading to cache poisoning. The highest threat from this vulnerability is to data confidentiality and integrity. (CVE-2020-15810)

A flaw was found in squid. Due to incorrect data validation, an HTTP Request Splitting attack against HTTP and HTTPS traffic is possible leading to cache poisoning. The highest threat from this vulnerability is to data confidentiality and integrity. (CVE-2020-15811)

Squid before 4.13 and 5.x before 5.0.4 allows a trusted peer to perform Denial of Service by consuming all available CPU cycles during handling of a crafted Cache Digest response message. This only occurs when cache_peer is used with the cache digests feature. The problem exists because peerDigestHandleReply() livelocking in peer_digest.cc mishandles EOF. (CVE-2020-24606)

Affected Packages:

squid

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 squid to update your system.

New Packages:

aarch64:  
    squid-3.5.20-17.amzn2.4.1.aarch64  
    squid-sysvinit-3.5.20-17.amzn2.4.1.aarch64  
    squid-migration-script-3.5.20-17.amzn2.4.1.aarch64  
    squid-debuginfo-3.5.20-17.amzn2.4.1.aarch64  
  
i686:  
    squid-3.5.20-17.amzn2.4.1.i686  
    squid-sysvinit-3.5.20-17.amzn2.4.1.i686  
    squid-migration-script-3.5.20-17.amzn2.4.1.i686  
    squid-debuginfo-3.5.20-17.amzn2.4.1.i686  
  
src:  
    squid-3.5.20-17.amzn2.4.1.src  
  
x86_64:  
    squid-3.5.20-17.amzn2.4.1.x86_64  
    squid-sysvinit-3.5.20-17.amzn2.4.1.x86_64  
    squid-migration-script-3.5.20-17.amzn2.4.1.x86_64  
    squid-debuginfo-3.5.20-17.amzn2.4.1.x86_64  

Additional References

Red Hat: CVE-2020-15810, CVE-2020-15811, CVE-2020-24606

Mitre: CVE-2020-15810, CVE-2020-15811, CVE-2020-24606