CVE-2019-17498: debian debian_linux Integer Overflow or Wraparound

Vulnerability summary

CVE-2019-17498 is a high (CVSS 8.1) Integer Overflow or Wraparound vulnerability in debian debian_linux. EPSS estimates a 3.81% chance of exploitation in the next 30 days, higher than 90% of scored vulnerabilities. 2 public exploits are recorded.

Timeline

1. 21-10-2019
   PublishedVulnerability first disclosed.
2. 14-10-2026
   Last modifiedVulnerability information updated.

Description

In libssh2 v1.9.0 and earlier versions, the SSH_MSG_DISCONNECT logic in packet.c has an integer overflow in a bounds check, enabling an attacker to specify an arbitrary (out-of-bounds) offset for a subsequent memory read. A crafted SSH server may be able to disclose sensitive information or cause a denial of service condition on the client system when a user connects to the server.

• CWE-190Integer Overflow or WraparoundThe product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.