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Debian LTS Advisory DLA-3437-1                debian-lts@lists.debian.org
https://www.debian.org/lts/security/                         Tobias Frost
May 29, 2023                                  https://wiki.debian.org/LTS
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Package        : libssh
Version        : 0.8.7-1+deb10u2
CVE ID         : CVE-2019-14889 CVE-2023-1667
Debian Bug     : 946548 1035832

Two security issues have been discovered in libssh, a tiny C SSH
library, which may allows an remote authenticated user to cause a denial
of service or inject arbitrary commands.

CVE-2019-14889

    A flaw was found with the libssh API function ssh_scp_new() in
    versions before 0.9.3 and before 0.8.8. When the libssh SCP client
    connects to a server, the scp command, which includes a
    user-provided path, is executed on the server-side. In case the
    library is used in a way where users can influence the third
    parameter of the function, it would become possible for an attacker
    to inject arbitrary commands, leading to a compromise of the remote
    target.

CVE-2023-1667

    A NULL pointer dereference was found In libssh during re-keying with
    algorithm guessing. This issue may allow an authenticated client to
    cause a denial of service.

For Debian 10 buster, these problems have been fixed in version
0.8.7-1+deb10u2.

We recommend that you upgrade your libssh packages.

For the detailed security status of libssh please refer to
its security tracker page at:
https://security-tracker.debian.org/tracker/source-package/libssh

Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://wiki.debian.org/LTS