Authentication bypass via guessable session tokens
Published Nov 30, 2023 · Updated Oct 16, 2024
Insufficient entropy in SEL-451 firmware allows remote attackers to brute-force session tokens and bypass authentication. The session mechanism generates tokens with too little entropy, leaving a search space that can be exhaustively guessed through a network interface. No credentials or user interaction are required; a successful guess grants an authenticated session with integrity impact to device operations but no vendor-reported confidentiality or availability impact.
Summary
What happened
Insufficient entropy in SEL-451 firmware allows remote attackers to brute-force session tokens and bypass authentication. The session mechanism generates tokens with too little entropy, leaving a search space that can be exhaustively guessed through a network interface. No credentials or user interaction are required; a successful guess grants an authenticated session with integrity impact to device operations but no vendor-reported confidentiality or availability impact.
The record
- CVE
- CVE-2023-31176
- Published
- Nov 30, 2023
- Updated
- Oct 16, 2024
- Vendor
- Schweitzer Engineering Laboratories
- Product
- SEL-451 Protection, Automation, and Bay Control System
- Classifications
- CWE-331, CAPEC-115, T1110
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Nov 30, 2023CVE publishedPublication date reported by the CVE source.
- Oct 16, 2024Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=R315-V0 <R315-V4
- Affected versionversion=R316-V0 <R316-V4
- Affected versionversion=R317-V0 <R317-V4
- Affected versionversion=R318-V0 <R318-V5
- Affected versionversion=R320-V0 <R320-V3
- Affected versionversion=R321-V0 <R321-V3
- Affected versionversion=R322-V0 <R322-V3
- Affected versionversion=R323-V0 <R323-V5
- Affected versionversion=R324-V0 <R324-V4
- Affected versionversion=R325-V0 <R325-V3
- Affected versionversion=R326-V0 <R326-V1
- Affected versionversion=R327-V0 <R327-V1
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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