Pre-authentication service crash via SSH length overflow
Published Oct 22, 2024 · Updated Oct 23, 2024
Integer overflow in Xlight FTP Server before 3.9.4.3 allows remote attackers to crash the SFTP service through a crafted SSH string length. The pre-authentication packet parser adds to a four-byte string length without safely detecting wraparound, then uses the result for allocation while memmove copies roughly 4 GB from attacker-controlled packet data beyond the heap buffer. Network access to an enabled SFTP listener is sufficient; 32-bit builds suffer an out-of-bounds heap write, while 64-bit builds allocate an oversized buffer and crash during an out-of-bounds read.
Summary
What happened
Integer overflow in Xlight FTP Server before 3.9.4.3 allows remote attackers to crash the SFTP service through a crafted SSH string length. The pre-authentication packet parser adds to a four-byte string length without safely detecting wraparound, then uses the result for allocation while memmove copies roughly 4 GB from attacker-controlled packet data beyond the heap buffer. Network access to an enabled SFTP listener is sufficient; 32-bit builds suffer an out-of-bounds heap write, while 64-bit builds allocate an oversized buffer and crash during an out-of-bounds read.
The record
- CVE
- CVE-2024-46483
- Published
- Oct 22, 2024
- Updated
- Oct 23, 2024
- Vendor
- Xlight
- Product
- Xlight FTP Server
- Classifications
- CWE-190, T1499
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Oct 22, 2024CVE publishedPublication date reported by the CVE source.
- Oct 23, 2024Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=0 <3.9.4.3
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
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
- CVE-2024-46483 Xlight SFTP heap-overflow proof of conceptfunctional · demonstrated
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Technologies
Your stack
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Your stack
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