UBUNTU-CVE-2019-17498

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    UBUNTU-CVE-2019-17498

    Published: 21 Oct 2019Last Modified: 22 Apr 2026
    Upstream:
    CVE-2019-17498
    Aliases:
    USN-5308-1

    Summary:

    Details: 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.

    References: https://ubuntu.com/security/CVE-2019-17498, https://blog.semmle.com/libssh2-integer-overflow-CVE-2019-17498/, https://github.com/kevinbackhouse/SecurityExploits/tree/8cbdbbe6363510f7d9ceec685373da12e6fc752d/libssh2/out_of_bounds_read_disconnect_CVE-2019-17498, https://github.com/libssh2/libssh2/blob/42d37aa63129a1b2644bf6495198923534322d64/src/packet.c#L480, https://github.com/libssh2/libssh2/pull/402/commits/1c6fa92b77e34d089493fe6d3e2c6c8775858b94, https://ubuntu.com/security/notices/USN-5308-1, https://www.cve.org/CVERecord?id=CVE-2019-17498

    Affected packages

    Package

    Name: libssh2

    Purl: pkg:deb/ubuntu/[email protected]+esm2?arch=source&distro=trusty/esm

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -1.4.3-2ubuntu0.2+esm2

    Affected versions

    1.4.3-1
    1.4.3-2
    1.4.3-2ubuntu0.1
    1.4.3-2ubuntu0.2
    1.4.3-2ubuntu0.2+esm1

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High