Bug 1687311 (CVE-2019-3861) - CVE-2019-3861 libssh2: Out-of-bounds reads with specially crafted SSH packets
Summary: CVE-2019-3861 libssh2: Out-of-bounds reads with specially crafted SSH packets
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2019-3861
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: 1688446 1688447 1688448 1690247 1690248 1690408 1696058 1697699
Blocks: 1687317
TreeView+ depends on / blocked
 
Reported: 2019-03-11 08:59 UTC by Andrej Nemec
Modified: 2023-09-26 13:22 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 packets with a padding length value greater than the packet length 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: 2019-08-06 13:22:11 UTC
Embargoed:


Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2019:2136 0 None None None 2019-08-06 12:19:43 UTC

Description Andrej Nemec 2019-03-11 08:59:21 UTC

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.

Comment 2 Andrej Nemec 2019-03-12 09:15:46 UTC
Acknowledgments:

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

Comment 8 Dhananjay Arunesh 2019-03-19 06:37:17 UTC
External References:

https://www.libssh2.org/CVE-2019-3861.html

Comment 9 Dhananjay Arunesh 2019-03-19 06:47:42 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 06:49:11 UTC
Created mingw-libssh2 tracking bugs for this issue:

Affects: epel-7 [bug 1690248]

Comment 11 Andrej Nemec 2019-03-19 12:27:52 UTC
Created libssh2 tracking bugs for this issue:

Affects: fedora-all [bug 1690408]

Comment 14 errata-xmlrpc 2019-08-06 12:19:41 UTC
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

Comment 15 Product Security DevOps Team 2019-08-06 13:22:11 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-2019-3861

Comment 16 Doran Moppert 2021-02-02 04:08:36 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.

libssh2 is no longer included in the virt module since Red Hat Enterprise Linux 8.1.


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