CVE-2019-3856: Integer Overflow
First published: Mon Mar 11 2019(Updated: )
A server could send a value approching unsinged int max number of keyboard prompt requests which could result in an unchecked interger overflow. The value would then be used to allocate memory causing a possible memory write out of bounds error.
Credit: secalert@redhat.com secalert@redhat.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| debian/libssh2 | 1.8.0-2.1 1.8.0-2.1+deb10u1 1.9.0-2 1.10.0-3 1.11.0-2 | |
| Libssh2 Libssh2 | <1.8.1 | |
| Debian Debian Linux | =8.0 | |
| Debian Debian Linux | =9.0 | |
| NetApp ONTAP Select Deploy administration utility | ||
| openSUSE Leap | =15.0 | |
| openSUSE Leap | =42.3 | |
| Redhat Enterprise Linux | =8.0 | |
| Redhat Enterprise Linux Desktop | =7.0 | |
| Redhat Enterprise Linux Server | =7.0 | |
| Redhat Enterprise Linux Server Aus | =7.6 | |
| Redhat Enterprise Linux Server Eus | =7.6 | |
| Redhat Enterprise Linux Server Tus | =7.6 | |
| Redhat Enterprise Linux Workstation | =7.0 | |
| Fedoraproject Fedora | =28 | |
| Oracle PeopleSoft Enterprise PeopleTools | =8.56 | |
| Oracle PeopleSoft Enterprise PeopleTools | =8.57 | |
| redhat/libssh2 | <1.8.1 | 1.8.1 |
| <1.8.1 | ||
| =8.0 | ||
| =9.0 | ||
| =15.0 | ||
| =42.3 | ||
| =8.0 | ||
| =7.0 | ||
| =7.0 | ||
| =7.6 | ||
| =7.6 | ||
| =7.6 | ||
| =7.0 | ||
| =28 | ||
| =8.56 | ||
| =8.57 |
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Reference Links
- https://www.libssh2.org/CVE-2019-3856.html
- https://libssh2.org/1.8.0-CVE/CVE-2019-3856.patch
- https://github.com/libssh2/libssh2/pull/315
- https://security-tracker.debian.org/tracker/CVE-2019-3856
- http://lists.opensuse.org/opensuse-security-announce/2019-03/msg00040.html
- http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00003.html
- https://access.redhat.com/errata/RHSA-2019:0679
- https://access.redhat.com/errata/RHSA-2019:1175
- https://access.redhat.com/errata/RHSA-2019:1652
- https://access.redhat.com/errata/RHSA-2019:1791
- https://access.redhat.com/errata/RHSA-2019:1943
- https://access.redhat.com/errata/RHSA-2019:2399
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-3856
- https://lists.debian.org/debian-lts-announce/2019/03/msg00032.html
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/5DK6VO2CEUTAJFYIKWNZKEKYMYR3NO2O/
- https://seclists.org/bugtraq/2019/Apr/25
- https://security.netapp.com/advisory/ntap-20190327-0005/
- https://www.debian.org/security/2019/dsa-4431
- https://www.oracle.com/technetwork/security-advisory/cpuoct2019-5072832.html
- https://github.com/libssh2/libssh2/commit/dc109a7f518757741590bb993c0c8412928ccec2
- https://www.openwall.com/lists/oss-security/2019/03/18/3
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1690246
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1690247
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1690248
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1690408
- https://bugzilla.redhat.com/show_bug.cgi?id=1687304
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5DK6VO2CEUTAJFYIKWNZKEKYMYR3NO2O/
Frequently Asked Questions
What is the vulnerability ID of this security flaw?
The vulnerability ID of this security flaw is CVE-2019-3856.
What is the severity level of CVE-2019-3856?
CVE-2019-3856 has a severity level of 8.8, which is considered high.
Which software versions are affected by CVE-2019-3856?
CVE-2019-3856 affects libssh2 versions before 1.8.1.
How can an attacker exploit CVE-2019-3856?
An attacker who compromises an SSH server can exploit CVE-2019-3856 to execute code on the client system when a user connects to the server.
Is there a fix available for CVE-2019-3856?
Yes, a fix is available for CVE-2019-3856 in libssh2 version 1.8.1.
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