# CVE-2024-57835: Amon2::Auth::Site::LINE versions through 0.04 for Perl uses insecure rand() function for cryptographic functions

> Attackers can predict nonce values due to insecure random number generation, potentially bypassing LINE authentication in Perl applications.

- **Severity:** Medium 5.5 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:L`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 5 Apr 2025
- **Updated:** 7 Apr 2025
- **Also known as:** GHSA-ch4m-2996-7xpv

## What is CVE-2024-57835?

CVE-2024-57835 is a medium-severity vulnerability in TANIGUCHI Amon2::Auth::Site::LINE, published on 5 Apr 2025. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.

### Official description

Amon2::Auth::Site::LINE uses the String::Random module to generate nonce values. 

String::Random defaults to Perl's built-in predictable random number generator, the rand() function, which is not cryptographically secure

Weakness: CWE-338 (Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG))

## Which versions are affected by CVE-2024-57835?

It affects 1 product.


Products: Nipotan Line Integration for Amon2.

## How do I fix CVE-2024-57835?

No fix has been published for CVE-2024-57835 yet. Limit exposure of the affected software until one is available.

## Is CVE-2024-57835 being exploited?

There is no known exploitation of CVE-2024-57835 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2024-57835 and fix it if it is affected.

What it is: CVE-2024-57835 is a medium-severity vulnerability in TANIGUCHI Amon2::Auth::Site::LINE, published on 5 Apr 2025. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2024-57835 in the wild and no public exploit code.

Affected product: TANIGUCHI Amon2::Auth::Site::LINE. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2024-57835/ (Markdown: https://insights.sbomify.com/CVE-2024-57835/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2024-57835
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2024-57835
- OSV: https://osv.dev/vulnerability/CVE-2024-57835

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From sbomify Insights: https://insights.sbomify.com/CVE-2024-57835/
Summaries are generated and may contain mistakes; the official description above is the record.