Full Report
Then you probably should get on this one… [Problems with Random Number Generator] While it looks like an arb openssl bug, 2 seconds of reading should get you to: -snip- It is strongly recommended that all cryptographic key material which has been generated by OpenSSL versions starting with 0.9.8c-1 on Debian systems is recreated from scratch. && Affected keys include SSH keys, OpenVPN keys, DNSSEC keys, and key material for use in X.509 certificates and session keys used in SSL/TLS connections. -snip-
Analysis Summary
This summary is based on the provided text snippet, which describes a critical flaw in the random number generator implementation on Debian systems, specifically impacting OpenSSL-generated keys.
# Vulnerability: Predictable Cryptographic Keys Due to RNG Flaw on Debian/OpenSSL
## CVE Details
- CVE ID: *Information not explicitly provided in the snippet, but contextually refers to a major, widely publicized event around 2008.*
- CVSS Score: *Score not provided in the snippet.*
- CWE: CWE-330 (Use of Insufficiently Random Values) - *Inferred based on "Problems with Random Number Generator."*
## Affected Systems
- Products: OpenSSL (specifically when used/packaged on Debian systems or Debian Derivatives like Ubuntu).
- Versions: OpenSSL versions starting with `0.9.8c-1` on Debian systems.
- Configurations: Any system using keys generated by the vulnerable OpenSSL package.
## Vulnerability Description
The issue stems from a flaw in the Random Number Generator (RNG) implementation within OpenSSL on specific Debian releases. This flaw results in the generation of weak or predictable cryptographic keys.
Affected key material includes:
* SSH keys
* OpenVPN keys
* DNSSEC keys
* X.509 certificate keys
* SSL/TLS session keys
## Exploitation
- Status: *Not explicitly stated if exploited in the wild, but severe enough to warrant mandatory key recreation.*
- Complexity: *Likely Low to Medium, as weak keys can be compromised much faster than strong keys.*
- Attack Vector: *Network (for compromised session/certificate keys); Local/Network (for compromised private keys).*
## Impact
- Confidentiality: **High** (Compromise of all cryptographic confidentiality protected by affected keys).
- Integrity: **High** (Ability to forge signatures or impersonate entities relying on affected certificates/keys).
- Availability: **Medium/Low** (Generally less direct impact on availability unless keys are revoked or systems are taken offline for patching).
## Remediation
### Patches
- The core fix involves updating the vulnerable package provided by Debian/derivatives.
- **Crucially, simply patching the system is insufficient.**
### Workarounds (Mandatory Action)
1. **Regenerate all cryptographic key material** that was generated using the vulnerable OpenSSL version on the affected systems.
2. This applies to SSH keys, OpenVPN keys, DNSSEC keys, X.509 certificates, and any pre-generated session keys.
## Detection
- Detection focuses primarily on identifying keys generated *before* the application of the patch and subsequent key recreation.
- **Detection Methods:** Auditing systems for the presence of keys generated during the affected time period. Tools capable of testing the statistical randomness or entropy of existing keys might be applicable, though comprehensive auditing for all affected key types is complex.
## References
- Vendor Advisories: [debian-security-announce/2008/msg00152.html] (Defanged link provided in source)
- Relevant Links: SensePost Article (May 2008)