Session theft via script-readable authentication cookie
Published Jun 13, 2023 · Updated Jan 3, 2025
Sensitive-cookie exposure in ABB REX640 PCL1, PCL2, and PCL3 firmware allows remote attackers to steal WHMI session cookies. The web server omits HttpOnly from its authentication cookie, so client-side scripts can read it in PCL1 before 1.0.8, PCL2 before 1.1.4, and PCL3 before 1.2.1. Exploitation requires network access and a legitimate user's interaction with attacker-controlled script content; a stolen cookie grants that user's WHMI session.
Summary
What happened
Sensitive-cookie exposure in ABB REX640 PCL1, PCL2, and PCL3 firmware allows remote attackers to steal WHMI session cookies. The web server omits HttpOnly from its authentication cookie, so client-side scripts can read it in PCL1 before 1.0.8, PCL2 before 1.1.4, and PCL3 before 1.2.1. Exploitation requires network access and a legitimate user's interaction with attacker-controlled script content; a stolen cookie grants that user's WHMI session.
The record
- CVE
- CVE-2023-2876
- Published
- Jun 13, 2023
- Updated
- Jan 3, 2025
- Vendor
- GENEREX SYSTEMS Computervertriebsgesellschaft mbH
- Product
- REX640 PCL2
- Classifications
- CWE-732, CWE-1004, T1539
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jun 13, 2023CVE publishedPublication date reported by the CVE source.
- Jan 3, 2025Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
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- Affected versionversion=1.0;0 <1.1.4
What conditions does exploitation require?
What is affected?
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
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Technologies
Your stack
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Your stack
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