REDHAT-BUG-2209501
First published: Wed May 24 2023(Updated: )
Description of issue(s): When /dev/urandom or RtlGenRandom() are unavailable, c-ares uses rand() to generate random numbers used for DNS query ids. This is not a CSPRNG, and it is also not seeded by srand() so will generate predictable output. Input from the random number generator is fed into a non-compilant RC4 implementation and may not be as strong as the original RC4 implementation. No attempt is made to look for modern OS-provided CSPRNGs like arc4random() that is widely available. <a href="https://access.redhat.com/security/cve/CVE-2023-31147">CVE-2023-31147</a> Insufficient randomness in generation of DNS query IDs (<a href="https://github.com/c-ares/c-ares/security/advisories/GHSA-8r8p-23f3-64c2">https://github.com/c-ares/c-ares/security/advisories/GHSA-8r8p-23f3-64c2</a>)
| Affected Software | Affected Version | How to fix |
|---|---|---|
| C-ares |
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Reference Links
- https://access.redhat.com/security/cve/CVE-2023-31147
- https://github.com/c-ares/c-ares/security/advisories/GHSA-8r8p-23f3-64c2
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2209542
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2209543
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2209539
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2209544
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2209545
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2209546
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2209540
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2209541
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2209547
- https://access.redhat.com/errata/RHSA-2023:3577
- https://access.redhat.com/errata/RHSA-2023:3586
- https://access.redhat.com/errata/RHSA-2023:4036
- https://access.redhat.com/errata/RHSA-2023:4039
- https://access.redhat.com/errata/RHSA-2023:4035
- https://access.redhat.com/errata/RHSA-2023:4034
- https://access.redhat.com/errata/RHSA-2023:4033
- https://access.redhat.com/errata/RHSA-2023:6635
- https://bugzilla.redhat.com/show_bug.cgi?id=2209501
Frequently Asked Questions
What is the severity of REDHAT-BUG-2209501?
The severity of REDHAT-BUG-2209501 is considered high due to the predictability of DNS query IDs that may lead to security vulnerabilities.
How do I fix REDHAT-BUG-2209501?
To fix REDHAT-BUG-2209501, update to a patched version of c-ares that uses a secure random number generator.
What are the potential risks associated with REDHAT-BUG-2209501?
The potential risks include exposure to DNS spoofing attacks due to predictable random number generation.
Which versions of c-ares are affected by REDHAT-BUG-2209501?
All versions of c-ares that rely on the rand() function for generating DNS query IDs are affected by REDHAT-BUG-2209501.
Is there a workaround for REDHAT-BUG-2209501?
There are no effective workarounds for REDHAT-BUG-2209501 aside from upgrading to a secure version of c-ares.
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