Bug 1687310 (CVE-2019-3860)

Summary: CVE-2019-3860 libssh2: Out-of-bounds reads with specially crafted SFTP packets
Product: [Other] Security Response Reporter: Andrej Nemec <anemec>
Component: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: bmcclain, dblechte, dfediuck, djuran, eedri, erik-fedora, kdudka, mgoldboi, michal.skrivanek, mike, paul, rjones, rschiron, sbonazzo, security-response-team, sherold, yturgema
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
Fixed In Version: libssh2 1.8.1 Doc Type: If docs needed, set a value
Doc Text:
An out of bounds read flaw was discovered in libssh2 in the way SFTP packets with empty payloads are parsed. A remote attacker who compromises a SSH server may be able to cause a denial of service or read data in the client memory.
Story Points: ---
Clone Of: Environment:
Last Closed: Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Bug Depends On: 1688443, 1688444, 1688445, 1690247, 1690248, 1690408, 1696058, 1697700    
Bug Blocks: 1687317    

Description Andrej Nemec 2019-03-11 08:58:36 UTC
A server could send a specially crafted partial SFTP packet with a empty payload
in response to various SFTP commands such as read directory, file status,
status vfs and symlink. The result would be a memory out of bounds read.

Comment 2 Andrej Nemec 2019-03-12 09:15:38 UTC

Name: the libssh2 project
Upstream: Chris Coulson (Canonical Ltd.)

Comment 7 Doran Moppert 2019-03-19 04:41:38 UTC

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.

Comment 9 Dhananjay Arunesh 2019-03-19 06:35:07 UTC
External References:


Comment 10 Dhananjay Arunesh 2019-03-19 06:47:23 UTC
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]

Comment 11 Dhananjay Arunesh 2019-03-19 06:48:53 UTC
Created mingw-libssh2 tracking bugs for this issue:

Affects: epel-7 [bug 1690248]

Comment 12 Andrej Nemec 2019-03-19 12:28:16 UTC
Created libssh2 tracking bugs for this issue:

Affects: fedora-all [bug 1690408]