------------------------------------------------------------------------- Debian LTS Advisory DLA-3559-1 debian-lts@lists.debian.org https://www.debian.org/lts/security/ Guilhem Moulin September 08, 2023 https://wiki.debian.org/LTS ------------------------------------------------------------------------- Package : libssh2 Version : 1.8.0-2.1+deb10u1 CVE ID : CVE-2019-13115 CVE-2019-17498 CVE-2020-22218 Debian Bug : 932329 943562 Vulnerabilities were found in libssh2, a client-side C library implementing the SSH2 protocol, which could lead to denial of service or remote information disclosure. CVE-2019-13115 Kevin Backhouse discovered an integer overflow vulnerability in kex.c's kex_method_diffie_hellman_group_exchange_sha256_key_exchange() function, which could lead to an out-of-bounds read in the way packets are read from the server. A remote attacker who compromises an 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 Kevin Backhouse discovered that the SSH_MSG_DISCONNECT logic in packet.c has an integer overflow in a bounds check, thereby enabling an attacker to specify an arbitrary (out-of-bounds) offset for a subsequent memory read. A malicious 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-2020-22218 An issue was discovered in function _libssh2_packet_add(), which could allow attackers to access out of bounds memory. For Debian 10 buster, these problems have been fixed in version 1.8.0-2.1+deb10u1. 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
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