CVE-2024-36127

Exposure of HTTP basic auth credentials from repository and keyring URLs in log output

Details

There was a handful of instances where the apko tool was outputting error messages and log entries where HTTP basic authentication credentials were exposed for one of two reasons:

1. The%s verb was used to format a url.URL as a string, which includes un-redacted HTTP basic authentication credentials if they are included in the URL.
2. A string URL value (such as from the configuration YAML file supplied used in an apko execution) was never parsed as a URL, so there was no chance of redacting credentials in the logical flow.

apko, as well as its companion library go-apk, have been updated to ensure URLs are parsed and redacted before being output as string values.

PoC

Create a config file like this apko.yaml:

contents:
  keyring:
    - https://packages.wolfi.dev/os/wolfi-signing.rsa.pub
  repositories:
    - https://me%40example.com:supersecretpassword@localhost:8080/os
  packages:
    - wolfi-base

cmd: /bin/sh -l

archs:
- x86_64
- aarch64

Then run:

apko build apko.yaml latest foo.tar --log-level debug

Observe instances of the password being shown verbatim in the log output, such as:

...
DEBU image configuration:
contents:
    repositories:
        - https://me%40example.com:supersecretpassword@localhost:8080/os
    keyring:
        - https://packages.wolfi.dev/os/wolfi-signing.rsa.pub
    packages:
        - wolfi-base
...

For users accessing keyring or APK repository content using HTTP basic auth, credentials were being logged in plaintext, depending on the user's logging settings. If you use apko in continuous integration jobs, it is likely that the credentials leak via logs of these jobs. Depending on the accessibility of these logs, this could be a company-internal or public leakage of credentials.

CVE-2024-36127 has a CVSS score of 7.5 (High). The vector is network-reachable, no privileges required, and no user interaction. A CVSS score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether this affects your application depends on whether the vulnerable code is present and reachable in your environment. A fixed version is available (0.14.5); upgrading removes the vulnerable code path.

Kodem intelligence

1. What is CVE-2024-36127? CVE-2024-36127 is a high-severity security vulnerability in chainguard.dev/apko (go), affecting versions < 0.14.5. It is fixed in 0.14.5.
2. How severe is CVE-2024-36127? CVE-2024-36127 has a CVSS score of 7.5 (High). This score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether it represents real risk in your environment depends on whether the vulnerable code is present and reachable.
3. Which versions of chainguard.dev/apko are affected by CVE-2024-36127? chainguard.dev/apko (go) versions < 0.14.5 is affected.
4. Is there a fix for CVE-2024-36127? Yes. CVE-2024-36127 is fixed in 0.14.5. Upgrade to this version or later.
5. Is CVE-2024-36127 exploitable, and should I be worried? Whether CVE-2024-36127 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
6. What actually determines whether CVE-2024-36127 is exploitable, and how bad it is? Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.
7. How do I fix CVE-2024-36127? Upgrade chainguard.dev/apko to 0.14.5 or later.