Proftpd: Out-of-bounds Read
CVE-2023-51713 is a high-severity out-of-bounds read vulnerability in Proftpd, with a CVSS 3.1 base score of 7.5 out of 10. It can be exploited remotely over the network by an unauthenticated attacker, without any action from a user. The record lists version 1.3.8a as the first without the flaw, so updating Proftpd to that release or later removes the exposure. There is no confirmed exploitation so far. EPSS estimates a 4.25% chance of exploitation within 30 days, which is in the top 8.8% of all scored CVEs.
High severity with no evidence of exploitation so far.
What to do
- Update Proftpd to 1.3.8a or a later version.
- Read the advisory on github.com for workarounds and exact fixed builds.
- Until you can update, restrict network access to the affected service so it is not reachable from untrusted networks.
Affected products and versions
Version data comes from NVD's product matching. Confirm against the vendor advisory before deciding you are unaffected.
How the severity score breaks down
- Attack vector
- NetworkCan be exploited remotely over a network, including the internet.
- Attack complexity
- LowNo special conditions are needed; the attack works reliably.
- Privileges required
- NoneNo account or login is needed.
- User interaction
- NoneNo action by a victim is required.
- Scope
- UnchangedImpact stays within the vulnerable component.
- Confidentiality
- NoneNo data is disclosed.
- Integrity
- NoneNothing can be modified.
- Availability
- HighThe component can be taken down completely.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H. Scored by NVD.
Official description
make_ftp_cmd in main.c in ProFTPD before 1.3.8a has a one-byte out-of-bounds read, and daemon crash, because of mishandling of quote/backslash semantics.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Out-of-bounds Read
The product reads data past the end, or before the beginning, of the intended buffer.
How developers prevent this class of flaw
- Use a language that provides appropriate memory abstractions.
Timeline
- CVE record published.
- Record last changed materially (score, affected products, status or references).
References
Advisories
- github.com/proftpd/proftpd/issues/1683Exploit, Issue Tracking
- github.com/proftpd/proftpd/issues/1683#issuecomment-1712887554Exploit, Issue Tracking
Patches and release notes
- github.com/proftpd/proftpd/blob/1.3.8/NEWSRelease Notes
Other references
Other vulnerabilities in Proftpd
- 8.8 High severity
- 8.1 High severity
- 8.1 High severity
- 7.5 High severity
- 10.0 High severity
ProFTPD Improper Access Control Exploited
Recent Out-of-bounds Read vulnerabilities
- 7.8 High severity
- 9.1 Critical severity
- 7.8 High severity
- 7.8 High severity
- 7.8 High severity
- 7.1 High severity
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