- ------------------------------------------------------------------------- Debian LTS Advisory DLA-2848-1 [email protected] https://www.debian.org/lts/security/ Anton Gladky December 17, 2021 https://wiki.debian.org/LTS - ------------------------------------------------------------------------- Package : libssh2 Version : 1.7.0-1+deb9u2 CVE ID : CVE-2019-13115 CVE-2019-17498 Two issues have been discovered in libssh2, a client-side C library implementing the SSH2 protocol: CVE-2019-13115: 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. CVE-2019-17498: 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. For Debian 9 stretch, these problems have been fixed in version 1.7.0-1+deb9u2. We recommend that you upgrade your libssh2 packages. For the detailed security status of libssh2 please refer to its security tracker page at: https://security-tracker.debian.org/tracker/libssh2 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