Candidate: CVE-2019-17498
PublicDate: 2019-10-21 22:15:00 UTC
References:
 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-17498
 https://blog.semmle.com/libssh2-integer-overflow-CVE-2019-17498/
 https://github.com/kevinbackhouse/SecurityExploits/tree/8cbdbbe6363510f7d9ceec685373da12e6fc752d/libssh2/out_of_bounds_read_disconnect_CVE-2019-17498
 https://github.com/libssh2/libssh2/blob/42d37aa63129a1b2644bf6495198923534322d64/src/packet.c#L480
 https://github.com/libssh2/libssh2/pull/402/commits/1c6fa92b77e34d089493fe6d3e2c6c8775858b94
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.
Ubuntu-Description:
 It was discovered that libssh2 incorrectly handled bound checks in
 SSH_MSG_DISCONNECT. A remote attacker could possibly use this issue to
 cause a denial of service or obtain sensitive information.
Notes:
Mitigation:
Bugs:
Priority: medium
Discovered-by:
Assigned-to:
CVSS:
 nvd: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H [8.1 HIGH]


Patches_libssh2:
 upstream: https://github.com/libssh2/libssh2/pull/402/commits/1c6fa92b77e34d089493fe6d3e2c6c8775858b94
upstream_libssh2: released (1.9.0-1, 1.4.3-4.1+deb8u6)
precise/esm_libssh2: DNE
trusty_libssh2: ignored (out of standard support)
trusty/esm_libssh2: needs-triage
xenial_libssh2: ignored (end of standard support, was needed)
bionic_libssh2: needed
disco_libssh2: ignored (reached end-of-life)
eoan_libssh2: ignored (reached end-of-life)
focal_libssh2: needed
groovy_libssh2: ignored (reached end-of-life)
hirsute_libssh2: not-affected (1.9.0-1)
impish_libssh2: not-affected (1.9.0-1)
jammy_libssh2: not-affected (1.9.0-1)
devel_libssh2: not-affected (1.9.0-1)