Unauthenticated service interruption via unbounded message allocation
Published Nov 8, 2021 · Updated Aug 4, 2024
Memory exhaustion in Barrier before 2.3.4 allows remote attackers to interrupt barriers or barrierc with oversized TCP messages. The receiver trusts a four-byte, network-order payload length of up to 2^32−1 and allocates heap memory without enforcing a message-size limit. Barrier servers accept this traffic without client authentication, while attacks on clients require an accepted server fingerprint; sustained or parallel messages can exhaust memory until the operating system kills the process.
Summary
What happened
Memory exhaustion in Barrier before 2.3.4 allows remote attackers to interrupt barriers or barrierc with oversized TCP messages. The receiver trusts a four-byte, network-order payload length of up to 2^32−1 and allocates heap memory without enforcing a message-size limit. Barrier servers accept this traffic without client authentication, while attacks on clients require an accepted server fingerprint; sustained or parallel messages can exhaust memory until the operating system kills the process.
The record
- CVE
- CVE-2021-42076
- Published
- Nov 8, 2021
- Updated
- Aug 4, 2024
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- CWE-787, T1499.003
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Nov 8, 2021CVE publishedPublication date reported by the CVE source.
- Aug 4, 2024Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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What conditions does exploitation require?
What is affected?
Affected products and versions are unavailable in this record.
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.
Public exploit references
- Barrier message-length denial-of-service reproducerfunctional · demonstrated
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Technologies
Your stack
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Your stack
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