CVE-2019-3856: Integer Overflow
A server could send a value approching unsinged int max number of keyboard prompt requests which could result in an unchecked interger overflow. The value would then be used to allocate memory causing a possible memory write out of bounds error.
Other sources
An integer overflow flaw, which could lead to an out of bounds write, was discovered in libssh2 before 1.8.1 in the way keyboard prompt requests are parsed. A remote attacker who compromises a SSH server may be able to execute code on the client system when a user connects to the server.
Affected Software
Remediation
Patch Available
Patch Available
Event History
Frequently Asked Questions
What is the vulnerability ID of this security flaw?
The vulnerability ID of this security flaw is CVE-2019-3856.
What is the severity level of CVE-2019-3856?
CVE-2019-3856 has a severity level of 8.8, which is considered high.
Which software versions are affected by CVE-2019-3856?
CVE-2019-3856 affects libssh2 versions before 1.8.1.
How can an attacker exploit CVE-2019-3856?
An attacker who compromises an SSH server can exploit CVE-2019-3856 to execute code on the client system when a user connects to the server.
Is there a fix available for CVE-2019-3856?
Yes, a fix is available for CVE-2019-3856 in libssh2 version 1.8.1.