CVE-2019-17498

NameCVE-2019-17498
DescriptionIn 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.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub code/issues, web search, more)
ReferencesDLA-1991-1
NVD severitymedium
Debian Bugs943562

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
libssh2 (PTS)jessie1.4.3-4.1+deb8u1vulnerable
jessie (security)1.4.3-4.1+deb8u6fixed
stretch (security), stretch1.7.0-1+deb9u1vulnerable
bullseye, sid, buster1.8.0-2.1vulnerable

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
libssh2source(unstable)(unfixed)943562
libssh2sourcejessie1.4.3-4.1+deb8u6DLA-1991-1

Notes

https://github.com/libssh2/libssh2/commit/dedcbd106f8e52d5586b0205bc7677e4c9868f9c
https://blog.semmle.com/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

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