CVE-2023-3603
Processing sftp server read may cause null dereference
CVSS Score
3.1
EPSS Score
0.0%
EPSS Percentile
0th
A missing allocation check in sftp server processing read requests may cause a NULL dereference on low-memory conditions. The malicious client can request up to 4GB SFTP reads, causing allocation of up to 4GB buffers, which was not being checked for failure. This will likely crash the authenticated user's sftp server connection (if implemented as forking as recommended). For thread-based servers, this might also cause DoS for legitimate users. Given this code is not in any released versions, no security releases have been issued.
| CWE | CWE-476 |
| Vendor | n/a |
| Product | libssh |
| Published | Jul 21, 2023 |
| Last Updated | Sep 26, 2024 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L Attack Vector
Network
Attack Complexity
High
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
Low
Affected Versions
n/a / libssh
All versions affected Red Hat / Red Hat Enterprise Linux 7
All versions affected Red Hat / Red Hat Enterprise Linux 8
All versions affected Red Hat / Red Hat Enterprise Linux 9
All versions affected Fedora / Extra Packages for Enterprise Linux 7
All versions affected Fedora / Fedora
All versions affected References
Credits
Upstream acknowledges Wei Chong Tan as the original reporter.