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How CVE-2022-31008 Works
RabbitMQ is a widely deployed multi‑protocol messaging and streaming broker. The Shovel and Federation plugins are two of its most commonly used extensions: Shovel moves messages between queues (including across brokers), while Federation links exchange data across distributed RabbitMQ instances. To store the connection URIs required by these plugins, RabbitMQ applies an obfuscation mechanism in the plugin’s worker (link) state.
The vulnerability stems from the way the encryption key for this obfuscation is generated. In affected versions, the key is seeded with a predictable secret. This means that the same seed value is used across many installations, making the obfuscation effectively deterministic rather than cryptographically secure. An attacker who gains access to the node logs – for example, through log aggregation systems, debugging outputs, or backup files – can, with relatively little effort, reverse the obfuscation and recover the plaintext URIs.
The issue is triggered when certain exceptions occur in the Shovel or Federation plugins. Under these error conditions, the obfuscated (but now trivially deobfuscatable) data is written to the RabbitMQ node log. Since the obfuscation key is predictable, an adversary who can read these logs can extract the URIs, which often contain credentials such as usernames, passwords, virtual host names, and even connection strings to external systems.
Patched versions replace the predictable seed with a cluster‑wide secret that is unique to each RabbitMQ deployment, rendering the obfuscation resistant to offline brute‑forcing or reverse engineering. The fix was backported to all supported release lines, and users are strongly advised to upgrade or, as a temporary measure, disable the Shovel and Federation plugins entirely.
The vulnerability was responsibly disclosed by Lajos Gerecs and Anh Nguyen from Erlang Solutions, and the RabbitMQ core team released coordinated patches across all affected branches.
DailyCVE Form
Platform: RabbitMQ Server
Version: 3.8.0 – 3.8.31, 3.9.0 – 3.9.17, 3.10.0 – 3.10.1
Vulnerability: Predictable credential obfuscation seed
Severity: Moderate (CVSS 5.5 – 7.5 depending on environment)
Date: October 5, 2022
Prediction: Patches released October 5, 2022 (3.10.2, 3.9.18, 3.8.32)
Analytics – What Undercode Say
The following commands and code snippets can be used to assess exposure, detect vulnerable versions, and inspect logs for signs of obfuscated URIs.
Check RabbitMQ version
rabbitmqctl status | grep rabbitmq
List enabled plugins (look for shovel and federation)
rabbitmq-plugins list -e | grep -E "rabbitmq_shovel|rabbitmq_federation"
Search node logs for obfuscated URI patterns (example)
grep -i "shovel.uri" /var/log/rabbitmq/.log
grep -i "federation.uri" /var/log/rabbitmq/.log
Extract obfuscated data – the seed is known, so reversal is possible
(Proof‑of‑concept script in Python)
python3 -c "
import base64
The predictable seed (simplified example)
seed = b'known_seed_value'
Decode obfuscated URI from log
obfuscated = '...' from log entry
Reverse the obfuscation (implementation depends on exact algorithm)
print('Recovered URI:', reverse_obfuscate(obfuscated, seed))
"
%% Erlang snippet showing the obfuscation logic (pre‑patch) %% The seed is derived from a constant, not from cluster state Seed = crypto:strong_rand_bytes(16), % actually predictable in vulnerable versions Encrypted = crypto:block_encrypt(aes_cbc, Seed, IV, PlainURI).
Exploit
An attacker with read access to RabbitMQ node logs can:
1. Locate log entries generated by Shovel or Federation plugin exceptions.
2. Extract the obfuscated URI strings from those entries.
3. Use the known (predictable) seed to reverse the obfuscation and recover the plaintext URI, including any embedded credentials.
4. Leverage the recovered credentials to connect to the broker, access queues, consume messages, or pivot to other systems referenced in the URI.
Because the seed is static across many installations, this attack is not limited to a single environment; it can be automated and applied to logs from any vulnerable RabbitMQ deployment.
Protection
- Upgrade to one of the patched versions: 3.10.2, 3.9.18, or 3.8.32. These releases replace the predictable seed with a cluster‑wide secret that is unique to each deployment.
- If an immediate upgrade is not possible, disable the Shovel and Federation plugins entirely until the upgrade can be performed.
- Restrict log access – ensure that RabbitMQ node logs are readable only by trusted administrators and are not exposed to log‑aggregation systems that are accessible to unauthorised users.
- Rotate credentials that may have been exposed in logs prior to patching.
- Monitor logs for any unexpected entries that might indicate attempted exploitation.
Impact
- Confidentiality: High – credentials and connection URIs can be recovered from logs, leading to unauthorised access to message brokers and dependent systems.
- Integrity: None – the vulnerability does not allow modification of data.
- Availability: None – the vulnerability does not cause denial of service.
- Scope: The attack is remote in the sense that logs may be collected and analysed off‑premises, but the attacker must first obtain log access (e.g., via compromised monitoring tools, backups, or insider access).
- Widespread risk: Because the seed is predictable, the same technique works against any vulnerable installation, making this a supply‑chain style risk for organisations using RabbitMQ with these plugins enabled.
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Sources:
Reported By: github.com
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