FreeBSD : ruby -- multiple vulnerabilities (afc60484-0652-440e-b01a-5ef814747f06)
critical Nessus Plugin ID 118247
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Synopsis
The remote FreeBSD host is missing one or more security-related updates.Description
Ruby news :CVE-2018-16395: OpenSSL::X509::Name equality check does not work correctly
An instance of OpenSSL::X509::Name contains entities such as CN, C and so on. Some two instances of OpenSSL::X509::Name are equal only when all entities are exactly equal. However, there is a bug that the equality check is not correct if the value of an entity of the argument (right-hand side) starts with the value of the receiver (left-hand side). So, if a malicious X.509 certificate is passed to compare with an existing certificate, there is a possibility to be judged incorrectly that they are equal.
CVE-2018-16396: Tainted flags are not propagated in Array#pack and String#unpack with some directives
Array#pack method converts the receiver's contents into a string with specified format. If the receiver contains some tainted objects, the returned string also should be tainted. String#unpack method which converts the receiver into an array also should propagate its tainted flag to the objects contained in the returned array. But, with B, b, H and h directives, the tainted flags are not propagated. So, if a script processes unreliable inputs by Array#pack and/or String#unpack with these directives and checks the reliability with tainted flags, the check might be wrong.
Solution
Update the affected packages.See Also
https://www.ruby-lang.org/en/news/2018/10/17/ruby-2-5-2-released/
http://www.nessus.org/u?2cb277f6
Plugin Details
Severity: Critical
ID: 118247
File Name: freebsd_pkg_afc604840652440eb01a5ef814747f06.nasl
Version: 1.3
Type: local
Family: FreeBSD Local Security Checks
Published: 10/22/2018
Updated: 12/19/2018
Dependencies: ssh_get_info.nasl
Risk Information
VPR
Risk Factor: Medium
Score: 5.9
CVSS v2
Risk Factor: High
Base Score: 7.5
Vector: AV:N/AC:L/Au:N/C:P/I:P/A:P
CVSS v3
Risk Factor: Critical
Base Score: 9.8
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Vulnerability Information
CPE: p-cpe:/a:freebsd:freebsd:ruby, cpe:/o:freebsd:freebsd
Required KB Items: Host/local_checks_enabled, Host/FreeBSD/release, Host/FreeBSD/pkg_info
Patch Publication Date: 10/20/2018
Vulnerability Publication Date: 10/17/2018
Reference Information
CVE: CVE-2018-16395, CVE-2018-16396