Bug 1687312 (CVE-2019-3862) - CVE-2019-3862 libssh2: Out-of-bounds memory comparison with specially crafted message channel request
Summary: CVE-2019-3862 libssh2: Out-of-bounds memory comparison with specially crafted...
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2019-3862
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1688495 1690247 1690248 1688494 1688496 1690408 1696058 1697698 1714210
Blocks: 1687317
TreeView+ depends on / blocked
 
Reported: 2019-03-11 09:00 UTC by Andrej Nemec
Modified: 2019-09-29 15:08 UTC (History)
17 users (show)

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.
Clone Of:
Environment:
Last Closed: 2019-07-29 19:18:31 UTC


Attachments (Terms of Use)


Links
System ID Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2019:1884 None None None 2019-07-29 15:13:44 UTC

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
Acknowledgments:

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

Comment 6 Doran Moppert 2019-03-19 04:41:53 UTC
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.

Comment 8 Dhananjay Arunesh 2019-03-19 06:39:04 UTC
External References:

https://www.libssh2.org/CVE-2019-3862.html

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):

https://access.redhat.com/security/cve/cve-2019-3862


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