Bug 1687312 (CVE-2019-3862)

Summary: CVE-2019-3862 libssh2: Out-of-bounds memory comparison with specially crafted message channel request
Product: [Other] Security Response Reporter: Andrej Nemec <anemec>
Component: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Status: CLOSED ERRATA 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 SSH_MSG_CHANNEL_REQUEST packets with an exit status message and no payload 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: 2019-07-29 19:18:31 UTC 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: 1688494, 1688495, 1688496, 1690247, 1690248, 1690408, 1696058, 1697698, 1714210    
Bug Blocks: 1687317    

Description Andrej Nemec 2019-03-11 09:00:00 UTC
A server could send a specially crafted SSH_MSG_CHANNEL_REQUEST packet with an
exit status message and no payload. This would result in an out of bounds
memory comparison.

Comment 2 Andrej Nemec 2019-03-12 09:15:54 UTC

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

Comment 6 Doran Moppert 2019-03-19 04:41:53 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 8 Dhananjay Arunesh 2019-03-19 06:39:04 UTC
External References:


Comment 9 Dhananjay Arunesh 2019-03-19 06:47:49 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 10 Dhananjay Arunesh 2019-03-19 06:49:17 UTC
Created mingw-libssh2 tracking bugs for this issue:

Affects: epel-7 [bug 1690248]

Comment 11 Andrej Nemec 2019-03-19 12:28:04 UTC
Created libssh2 tracking bugs for this issue:

Affects: fedora-all [bug 1690408]

Comment 14 errata-xmlrpc 2019-07-29 15:13:43 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2019:1884 https://access.redhat.com/errata/RHSA-2019:1884

Comment 15 Product Security DevOps Team 2019-07-29 19:18:31 UTC
This bug is now closed. Further updates for individual products will be reflected on the CVE page(s):