WS_FTP Server Ad Hoc Transfer Module .NET Deserialization Vulnerability
Affects WS_FTP Server 8.7.0 to before 8.7.4 and 8.8.0 to before 8.8.2 when the Ad Hoc Transfer module is configured. Fixed in 8.7.4 and 8.8.2.
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Listed in CISA KEV
- How many real-world setups can hit the bug, from the vendor's advisory and CISA data. It does not know your setup.What do these mean? →
- Actively exploited
- Fix
- Fixed in 8.8.2, 8.7.4
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
Summary
The WS_FTP Server Ad Hoc Transfer module is affected by this vulnerability. An attacker who does not need to log in could exploit a flaw in how the module processes .NET serialized data to run commands on the underlying server operating system.
Summarized by anthropic/claude-haiku-5.5. Verify details against the original sources.
Read the original description
In WS_FTP Server versions prior to 8.7.4 and 8.8.2, a pre-authenticated attacker could leverage a .NET deserialization vulnerability in the Ad Hoc Transfer module to execute remote commands on the underlying WS_FTP Server operating system.
Timeline
- CVE published
- Added to CISA KEV
CISA has evidence of exploitation in the wild
- CISA remediation deadline
Due date for US federal agencies to patch
- Record last updated
- EPSS reached 10%
FIRST estimates at least a 10% chance of exploitation in the next 30 days
Affected versions
- Progress Software Corporation WS_FTP Server
From 8.8.0 · fixed in 8.8.2; From 8.7.0 · fixed in 8.7.4
References 8
progress.com
community.progress.com
theregister.com
attackerkb.com
censys.com
packetstormsecurity.com
Questions about CVE-2023-40044
What does this mean?
The flaw is a .NET deserialization vulnerability in the Ad Hoc Transfer module of WS_FTP Server. Deserialization bugs occur when the software unsafely processes serialized data.Source: theregister.com
Am I affected, and how do I check?
Versions 8.7.0 through 8.7.3 and 8.8.0 through 8.8.1 are in the affected ranges, and only where the Ad Hoc Transfer module is configured. To check, look up the installed WS_FTP Server version and whether the Ad Hoc Transfer module is set up.Source: theregister.com
What should I do about it?
Upgrade to 8.7.4 on the 8.7 line or 8.8.2 on the 8.8 line. The vendor advises upgrading to the latest version of WS_FTP as soon as possible.Source: theregister.com
Is it being exploited?
Yes. CISA added it to its Known Exploited Vulnerabilities catalog on 2023-10-05, which means it has evidence of attacks. No public exploit code is tracked.Source: cisa.gov, cve.now feed data
Why do the sources disagree?
The description says the flaw requires an authenticated user, but the vector string says no privileges are required (PR:N). Both statements appear in the sources, and the facts do not resolve which is correct.Source: theregister.com