Important: amazon-ssm-agent

Issue Overview:

2024-04-24: CVE-2023-49568 was added to this advisory.

2024-02-29: CVE-2023-39326 was added to this advisory.

2024-02-29: CVE-2023-39325 was added to this advisory.

The HTTP/2 protocol allows a denial of service (server resource consumption) because request cancellation can reset many streams quickly, as exploited in the wild in August through October 2023. (CVE-2023-39325)

A malicious HTTP sender can use chunk extensions to cause a receiver reading from a request or response body to read many more bytes from the network than are in the body. A malicious HTTP client can further exploit this to cause a server to automatically read a large amount of data (up to about 1GiB) when a handler fails to read the entire body of a request. Chunk extensions are a little-used HTTP feature which permit including additional metadata in a request or response body sent using the chunked encoding. The net/http chunked encoding reader discards this metadata. A sender can exploit this by inserting a large metadata segment with each byte transferred. The chunk reader now produces an error if the ratio of real body to encoded bytes grows too small. (CVE-2023-39326)

A denial of service (DoS) vulnerability was discovered in go-git versions prior to v5.11. This vulnerability allows an attacker to perform denial of service attacks by providing specially crafted responses from a Git server which triggers resource exhaustion in go-git clients.

Applications using only the in-memory filesystem supported by go-git are not affected by this vulnerability.
This is a go-git implementation issue and does not affect the upstream git cli. (CVE-2023-49568)

A path traversal vulnerability was discovered in go-git versions prior to v5.11. This vulnerability allows an attacker to create and amend files across the filesystem. In the worse case scenario, remote code execution could be achieved.

Applications are only affected if they are using the ChrootOS https://pkg.go.dev/github.com/go-git/go-billy/v5/osfs#ChrootOS , which is the default when using “Plain” versions of Open and Clone funcs (e.g. PlainClone). Applications using BoundOS https://pkg.go.dev/github.com/go-git/go-billy/v5/osfs#BoundOS or in-memory filesystems are not affected by this issue.
This is a go-git implementation issue and does not affect the upstream git cli. (CVE-2023-49569)

Affected Packages:

amazon-ssm-agent

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 amazon-ssm-agent to update your system.

New Packages:

aarch64:  
    amazon-ssm-agent-3.2.2222.0-1.amzn2.aarch64  
    amazon-ssm-agent-debuginfo-3.2.2222.0-1.amzn2.aarch64  
  
src:  
    amazon-ssm-agent-3.2.2222.0-1.amzn2.src  
  
x86_64:  
    amazon-ssm-agent-3.2.2222.0-1.amzn2.x86_64  
    amazon-ssm-agent-debuginfo-3.2.2222.0-1.amzn2.x86_64  

Additional References

Red Hat: CVE-2023-39325, CVE-2023-39326, CVE-2023-49568, CVE-2023-49569

Mitre: CVE-2023-39325, CVE-2023-39326, CVE-2023-49568, CVE-2023-49569