A server could send a specially crafted SSH packet with a padding length value greater than the packet length. This would result in a buffer read out of bounds when decompressing the packet or result in a corrupted packet value.
Acknowledgments: Name: the libssh2 project Upstream: Chris Coulson (Canonical Ltd.)
Reference: https://www.openwall.com/lists/oss-security/2019/03/18/3 Upstream Patch: https://libssh2.org/1.8.0-CVE/CVE-2019-3861.patch
External References: https://www.libssh2.org/CVE-2019-3861.html
Created libssh tracking bugs for this issue: Affects: fedora-all [bug 1690246] Created mingw-libssh2 tracking bugs for this issue: Affects: fedora-all [bug 1690247]
Created mingw-libssh2 tracking bugs for this issue: Affects: epel-7 [bug 1690248]
Created libssh2 tracking bugs for this issue: Affects: fedora-all [bug 1690408]
This issue has been addressed in the following products: Red Hat Enterprise Linux 7 Via RHSA-2019:2136 https://access.redhat.com/errata/RHSA-2019:2136
This bug is now closed. Further updates for individual products will be reflected on the CVE page(s): https://access.redhat.com/security/cve/cve-2019-3861
Statement: This flaw was present in libssh2 packages included in Red Hat Virtualization Hypervisor and Management Appliance, however libssh2 in these hosts is never exposed to malicious clients or servers. libssh2 is no longer included in the virt module since Red Hat Enterprise Linux 8.1.