Out-of-bounds Read

Affecting libssh2 package, versions <1.4.3-4.1+deb8u4

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Overview

In libssh2 before 1.9.0, kex_method_diffie_hellman_group_exchange_sha256_key_exchange in kex.c has an integer overflow that could lead to an out-of-bounds read in the way packets are read from the server. A remote attacker who compromises a 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. This is related to an _libssh2_check_length mistake, and is different from the various issues fixed in 1.8.1, such as CVE-2019-3855.

References

CVSS Score

8.1
high severity
  • Attack Vector
    Network
  • Attack Complexity
    Low
  • Privileges Required
    None
  • User Interaction
    Required
  • Scope
    Unchanged
  • Confidentiality
    High
  • Integrity
    None
  • Availability
    High
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H
CVE
CVE-2019-13115
CWE
CWE-125 CWE-190
Snyk ID
SNYK-DEBIAN8-LIBSSH2-453623
Disclosed
16 Jul, 2019
Published
24 Jul, 2019