CVE-2019-3856

high-risk
Published 2019-03-25

An integer overflow flaw, which could lead to an out of bounds write, was discovered in libssh2 before 1.8.1 in the way keyboard prompt requests are parsed. A remote attacker who compromises a SSH server may be able to execute code on the client system when a user connects to the server.

Do I need to act?

~
4.4% chance of exploitation in next 30 days
EPSS score — moderate exploit probability
-
Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
8
CVSS 8.8/10 High
NETWORK / LOW complexity

Affected Products (16)

Affected Vendors

Debian Redhat Oracle Fedoraproject Netapp Opensuse Libssh2

References (32)

Mailing List http://lists.opensuse.org/opensuse-security-announce/2019-03/msg00040.html
Third Party Advisory http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00003.html
Third Party Advisory https://access.redhat.com/errata/RHSA-2019:0679
Third Party Advisory https://access.redhat.com/errata/RHSA-2019:1175
Third Party Advisory https://access.redhat.com/errata/RHSA-2019:1652
Third Party Advisory https://access.redhat.com/errata/RHSA-2019:1791
Third Party Advisory https://access.redhat.com/errata/RHSA-2019:1943
Third Party Advisory https://access.redhat.com/errata/RHSA-2019:2399
Issue Tracking https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-3856
Third Party Advisory https://lists.debian.org/debian-lts-announce/2019/03/msg00032.html
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro...
Mailing List https://seclists.org/bugtraq/2019/Apr/25
Third Party Advisory https://security.netapp.com/advisory/ntap-20190327-0005/
Third Party Advisory https://www.debian.org/security/2019/dsa-4431
Patch https://www.libssh2.org/CVE-2019-3856.html
Patch https://www.oracle.com/technetwork/security-advisory/cpuoct2019-5072832.html
Mailing List http://lists.opensuse.org/opensuse-security-announce/2019-03/msg00040.html
Third Party Advisory http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00003.html
Third Party Advisory https://access.redhat.com/errata/RHSA-2019:0679
Third Party Advisory https://access.redhat.com/errata/RHSA-2019:1175
and 12 more references
56
/ 100
high-risk
Severity 30/34 · Critical
Exploitability 8/34 · Low
Exposure 18/34 · Moderate