Scientific Linux Security Update : ruby on SL7.x x86_64

High Nessus Plugin ID 107084


The remote Scientific Linux host is missing one or more security updates.


Security Fix(es) :

- It was discovered that the Net::FTP module did not properly process filenames in combination with certain operations. A remote attacker could exploit this flaw to execute arbitrary commands by setting up a malicious FTP server and tricking a user or Ruby application into downloading files with specially crafted names using the Net::FTP module. (CVE-2017-17405)

- A buffer underflow was found in ruby's sprintf function.
An attacker, with ability to control its format string parameter, could send a specially crafted string that would disclose heap memory or crash the interpreter.

- It was found that rubygems did not sanitize gem names during installation of a given gem. A specially crafted gem could use this flaw to install files outside of the regular directory. (CVE-2017-0901)

- A vulnerability was found where rubygems did not sanitize DNS responses when requesting the hostname of the rubygems server for a domain, via a _rubygems._tcp DNS SRV query. An attacker with the ability to manipulate DNS responses could direct the gem command towards a different domain. (CVE-2017-0902)

- A vulnerability was found where the rubygems module was vulnerable to an unsafe YAML deserialization when inspecting a gem. Applications inspecting gem files without installing them can be tricked to execute arbitrary code in the context of the ruby interpreter.

- It was found that WEBrick did not sanitize all its log messages. If logs were printed in a terminal, an attacker could interact with the terminal via the use of escape sequences. (CVE-2017-10784)

- It was found that the decode method of the OpenSSL::ASN1 module was vulnerable to buffer underrun. An attacker could pass a specially crafted string to the application in order to crash the ruby interpreter, causing a denial of service. (CVE-2017-14033)

- A vulnerability was found where rubygems did not properly sanitize gems' specification text. A specially crafted gem could interact with the terminal via the use of escape sequences. (CVE-2017-0899)

- It was found that rubygems could use an excessive amount of CPU while parsing a sufficiently long gem summary. A specially crafted gem from a gem repository could freeze gem commands attempting to parse its summary.

- A buffer overflow vulnerability was found in the JSON extension of ruby. An attacker with the ability to pass a specially crafted JSON input to the extension could use this flaw to expose the interpreter's heap memory.

- The 'lazy_initialize' function in lib/resolv.rb did not properly process certain filenames. A remote attacker could possibly exploit this flaw to inject and execute arbitrary commands. (CVE-2017-17790)


Update the affected packages.

See Also

Plugin Details

Severity: High

ID: 107084

File Name: sl_20180228_ruby_on_SL7_x.nasl

Version: $Revision: 3.1 $

Type: local

Agent: unix

Published: 2018/03/01

Modified: 2018/03/01

Dependencies: 12634

Risk Information

Risk Factor: High


Base Score: 9.3

Vector: CVSS2#AV:N/AC:M/Au:N/C:C/I:C/A:C


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: x-cpe:/o:fermilab:scientific_linux

Required KB Items: Host/local_checks_enabled, Host/cpu, Host/RedHat/release, Host/RedHat/rpm-list

Patch Publication Date: 2018/02/28

Reference Information

CVE: CVE-2017-0898, CVE-2017-0899, CVE-2017-0900, CVE-2017-0901, CVE-2017-0902, CVE-2017-0903, CVE-2017-10784, CVE-2017-14033, CVE-2017-14064, CVE-2017-17405, CVE-2017-17790