Denial of service via unchecked SSH offset
Published Apr 23, 2020 · Updated Aug 4, 2024
Out-of-bounds read in nDPI 3.0 through 3.2 allows remote attackers to interrupt network inspection via malformed SSH traffic. The concat_hash_string function in ssh.c adds an attacker-controlled SSH string length to a 16-bit packet offset, then dereferences the resulting offset without a payload-bounds check. The traffic must cross a segment monitored by an nDPI-linked inspection stack; the documented consequence is limited to denial of service.
Summary
What happened
Out-of-bounds read in nDPI 3.0 through 3.2 allows remote attackers to interrupt network inspection via malformed SSH traffic. The concat_hash_string function in ssh.c adds an attacker-controlled SSH string length to a 16-bit packet offset, then dereferences the resulting offset without a payload-bounds check. The traffic must cross a segment monitored by an nDPI-linked inspection stack; the documented consequence is limited to denial of service.
The record
- CVE
- CVE-2020-11940
- Published
- Apr 23, 2020
- Updated
- Aug 4, 2024
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- CWE-125, T1499.004
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Apr 23, 2020CVE 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 is affected?
Affected products and versions are unavailable in this record.
Attacks
What attackers are doing with it
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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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