Snyk test report

Denial of Service (DoS)

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Overview

google.golang.org/grpc is a Go implementation of gRPC

Affected versions of this package are vulnerable to Denial of Service (DoS) in the implementation of the HTTP/2 protocol. An attacker can cause a denial of service (including via DDoS) by rapidly resetting many streams through request cancellation.

Remediation

Upgrade google.golang.org/grpc to version 1.56.3, 1.57.1, 1.58.3 or higher.

References

• Github Commit
• GitHub Commit
• GitHub Commit
• GitHub Commit
• GitHub Commit
• GitHub Commit
• GitHub Commit
• GitHub Commit
• GitHub Commit
• Snyk Blog
• Vulnerability Discovery
• Vulnerability Explanation
• CISA - Known Exploited Vulnerabilities

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Denial of Service (DoS)

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Overview

golang.org/x/net/http2 is a work-in-progress HTTP/2 implementation for Go.

Affected versions of this package are vulnerable to Denial of Service (DoS) in the implementation of the HTTP/2 protocol. An attacker can cause a denial of service (including via DDoS) by rapidly resetting many streams through request cancellation.

Remediation

Upgrade golang.org/x/net/http2 to version 0.17.0 or higher.

References

• Github Commit
• GitHub Commit
• GitHub Commit
• GitHub Commit
• GitHub Commit
• GitHub Commit
• GitHub Commit
• GitHub Commit
• GitHub Commit
• Snyk Blog
• Vulnerability Discovery
• Vulnerability Explanation
• CISA - Known Exploited Vulnerabilities

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Directory Traversal

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Overview

Affected versions of this package are vulnerable to Directory Traversal via the filepath.FromSlash() function, allwoing attackers to generate paths that were outside of the provided rootfs.

Note: This vulnerability is only exploitable on Windows OS.

Details

A Directory Traversal attack (also known as path traversal) aims to access files and directories that are stored outside the intended folder. By manipulating files with "dot-dot-slash (../)" sequences and its variations, or by using absolute file paths, it may be possible to access arbitrary files and directories stored on file system, including application source code, configuration, and other critical system files.

Directory Traversal vulnerabilities can be generally divided into two types:

• Information Disclosure: Allows the attacker to gain information about the folder structure or read the contents of sensitive files on the system.

st is a module for serving static files on web pages, and contains a vulnerability of this type. In our example, we will serve files from the public route.

If an attacker requests the following URL from our server, it will in turn leak the sensitive private key of the root user.

curl http://localhost:8080/public/%2e%2e/%2e%2e/%2e%2e/%2e%2e/%2e%2e/root/.ssh/id_rsa
        

Note %2e is the URL encoded version of . (dot).

• Writing arbitrary files: Allows the attacker to create or replace existing files. This type of vulnerability is also known as Zip-Slip.

One way to achieve this is by using a malicious zip archive that holds path traversal filenames. When each filename in the zip archive gets concatenated to the target extraction folder, without validation, the final path ends up outside of the target folder. If an executable or a configuration file is overwritten with a file containing malicious code, the problem can turn into an arbitrary code execution issue quite easily.

The following is an example of a zip archive with one benign file and one malicious file. Extracting the malicious file will result in traversing out of the target folder, ending up in /root/.ssh/ overwriting the authorized_keys file:

2018-04-15 22:04:29 .....           19           19  good.txt
        2018-04-15 22:04:42 .....           20           20  ../../../../../../root/.ssh/authorized_keys
        

Remediation

Upgrade github.com/cyphar/filepath-securejoin to version 0.2.4 or higher.

References

• GitHub Commit
• GitHub PR
• GitHub Release

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