| Name | CVE-2019-17498 |
| Description | 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. |
| Source | CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
| References | DLA-1991-1, DLA-2848-1, DLA-3559-1, ELA-186-1 |
| Debian Bugs | 943562 |
Vulnerable and fixed packages
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|
| libssh2 (PTS) | jessie, jessie (lts) | 1.4.3-4.1+deb8u7 | fixed |
| stretch (security) | 1.7.0-1+deb9u2 | fixed |
| stretch (lts), stretch | 1.7.0-1+deb9u3 | fixed |
| buster (security), buster, buster (lts) | 1.8.0-2.1+deb10u1 | fixed |
| bullseye | 1.9.0-2+deb11u1 | fixed |
| bookworm | 1.10.0-3 | fixed |
| sid, trixie | 1.11.1-1 | fixed |
The information below is based on the following data on fixed versions.
Notes
https://github.com/libssh2/libssh2/commit/dedcbd106f8e52d5586b0205bc7677e4c9868f9c
https://securitylab.github.com/research/libssh2-integer-overflow-CVE-2019-17498/
Backported SUSE patch for versions <= 1.8.0 (including struct string_buf,
and the functions _libssh2_check_length(), _libssh2_get_u32() and
libssh2_get_string(), forming part of the fix):
https://bugzilla.suse.com/attachment.cgi?id=822416
Only exploitable with a malicious server