The remote NewStart CGSL host, running version MAIN 5.04, has ruby packages installed that are affected by multiple vulnerabilities:

  - 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.
    (CVE-2017-14064)

  - 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)

  - 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.
    (CVE-2017-0898)

  - 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)

  - 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 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)

  - 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.
    (CVE-2017-0900)

  - 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 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)

  - 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.
    (CVE-2017-0903)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

- Fix ANSI escape sequence vulnerability (CVE-2017-0899).

  - Fix DoS vulnerability in the query command     (CVE-2017-0900).

  - Fix a vulnerability in the gem installer that allowed a     malicious gem to overwrite arbitrary files     (CVE-2017-0901).

  - Fix DNS request hijacking vulnerability (CVE-2017-0902).

  - Fix arbitrary heap exposure during a JSON.generate call     (CVE-2017-14064).

Note that Tenable Network Security has extracted the preceding description block directly from the Fedora update system website.
Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

The remote Oracle Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2018-0378 advisory.

    - Add Psych.safe_load
      * ruby-2.1.0-there-should-be-only-one-exception.patch
      * ruby-2.1.0-Adding-Psych.safe_load.patch       Related: CVE-2017-0903
    - Disable Tokyo TZ tests broken by recen tzdata update.
      * ruby-2.5.0-Disable-Tokyo-TZ-tests.patch       Related: CVE-2017-0903
    - Fix unsafe object deserialization in RubyGems (CVE-2017-0903).
      * ruby-2.4.3-CVE-2017-0903-Fix-unsafe-object-deserialization
          -vulnerability.patch       Resolves: CVE-2017-0903
    - Fix an ANSI escape sequence vulnerability (CVE-2017-0899).
      Resolves: CVE-2017-0899
    - Fix a DOS vulernerability in the query command (CVE-2017-0900).
      Resolves: CVE-2017-0900
    - Fix a vulnerability in the gem installer that allowed a malicious gem         to overwrite arbitrary files (CVE-2017-0901).
      Resolves: CVE-2017-0901
    - Fix a DNS request hijacking vulnerability (CVE-2017-0902).
      * ruby-2.2.8-lib-rubygems-fix-several-vulnerabilities-in-RubyGems.patch       Resolves: CVE-2017-0902
    - Fix buffer underrun vulnerability in Kernel.sprintf (CVE-2017-0898).
      * ruby-2.2.8-Buffer-underrun-vulnerability-in-Kernel.sprintf.patch       Resolves: CVE-2017-0898
    - Escape sequence injection vulnerability in the Basic         authentication of WEBrick (CVE-2017-10784).
      * ruby-2.2.8-sanitize-any-type-of-logs.patch       Resolves: CVE-2017-10784
    - Arbitrary heap exposure during a JSON.generate call (CVE-2017-14064).
      * ruby-2.2.8-Fix-arbitrary-heap-exposure-during-a-JSON.generate-call.patch       Resolves: CVE-2017-14064
    - Command injection vulnerability in Net::FTP (CVE-2017-17405).
      * ruby-2.2.9-Fix-a-command-injection-vulnerability-in-Net-FTP.patch       Resolves: CVE-2017-17405
    - Buffer underrun in OpenSSL ASN1 decode (CVE-2017-14033).
      * ruby-2.2.8-asn1-fix-out-of-bounds-read-in-decoding-constructed-objects.patch       Resolves: CVE-2017-14033

Tenable has extracted the preceding description block directly from the Oracle Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Multiple vulnerabilities were found in the interpreter for the Ruby language. The Common Vulnerabilities and Exposures project identifies the following issues :

CVE-2015-9096

SMTP command injection in Net::SMTP via CRLF sequences in a RCPT TO or MAIL FROM command.

CVE-2016-2339

Exploitable heap overflow in Fiddle::Function.new.

CVE-2016-7798

Incorrect handling of initialization vector in the GCM mode in the OpenSSL extension.

CVE-2017-0898

Buffer underrun vulnerability in Kernel.sprintf.

CVE-2017-0899

ANSI escape sequence vulnerability in RubyGems.

CVE-2017-0900

DoS vulnerability in the RubyGems query command.

CVE-2017-0901

gem installer allowed a malicious gem to overwrite arbitrary files.

CVE-2017-0902

RubyGems DNS request hijacking vulnerability.

CVE-2017-0903

Max Justicz reported that RubyGems is prone to an unsafe object deserialization vulnerability. When parsed by an application which processes gems, a specially crafted YAML formatted gem specification can lead to remote code execution.

CVE-2017-10784

Yusuke Endoh discovered an escape sequence injection vulnerability in the Basic authentication of WEBrick. An attacker can take advantage of this flaw to inject malicious escape sequences to the WEBrick log and potentially execute control characters on the victim's terminal emulator when reading logs.

CVE-2017-14033

asac reported a buffer underrun vulnerability in the OpenSSL extension. A remote attacker could take advantage of this flaw to cause the Ruby interpreter to crash leading to a denial of service.

CVE-2017-14064

Heap memory disclosure in the JSON library.

CVE-2017-17405

A command injection vulnerability in Net::FTP might allow a malicious FTP server to execute arbitrary commands.

CVE-2017-17742

Aaron Patterson reported that WEBrick bundled with Ruby was vulnerable to an HTTP response splitting vulnerability. It was possible for an attacker to inject fake HTTP responses if a script accepted an external input and output it without modifications.

CVE-2017-17790

A command injection vulnerability in lib/resolv.rb's lazy_initialze might allow a command injection attack. However untrusted input to this function is rather unlikely.

CVE-2018-6914

ooooooo_q discovered a directory traversal vulnerability in the Dir.mktmpdir method in the tmpdir library. It made it possible for attackers to create arbitrary directories or files via a .. (dot dot) in the prefix argument.

CVE-2018-8777

Eric Wong reported an out-of-memory DoS vulnerability related to a large request in WEBrick bundled with Ruby.

CVE-2018-8778

aerodudrizzt found a buffer under-read vulnerability in the Ruby String#unpack method. If a big number was passed with the specifier @, the number was treated as a negative value, and an out-of-buffer read occurred. Attackers could read data on heaps if an script accepts an external input as the argument of String#unpack.

CVE-2018-8779

ooooooo_q reported that the UNIXServer.open and UNIXSocket.open methods of the socket library bundled with Ruby did not check for NUL bytes in the path argument. The lack of check made the methods vulnerable to unintentional socket creation and unintentional socket access.

CVE-2018-8780

ooooooo_q discovered an unintentional directory traversal in some methods in Dir, by the lack of checking for NUL bytes in their parameter.

CVE-2018-1000075

A negative size vulnerability in ruby gem package tar header that could cause an infinite loop.

CVE-2018-1000076

RubyGems package improperly verifies cryptographic signatures. A mis-signed gem could be installed if the tarball contains multiple gem signatures.

CVE-2018-1000077

An improper input validation vulnerability in RubyGems specification homepage attribute could allow malicious gem to set an invalid homepage URL.

CVE-2018-1000078

Cross Site Scripting (XSS) vulnerability in gem server display of homepage attribute.

CVE-2018-1000079

Path Traversal vulnerability during gem installation.

For Debian 8 'Jessie', these problems have been fixed in version 2.1.5-2+deb8u4.

We recommend that you upgrade your ruby2.1 packages.

NOTE: Tenable Network Security has extracted the preceding description block directly from the DLA security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

The remote MiracleLinux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the AXSA:2018-2583:01 advisory.

    * 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. (CVE-2017-0898)
      * 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. (CVE-2017-0903)
      * 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. (CVE-2017-0900)
      * 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. (CVE-2017-14064)
      * 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)     CVE-2017-0898     Ruby before 2.4.2, 2.3.5, and 2.2.8 is vulnerable to a malicious     format string which contains a precious specifier (*) with a huge     minus value. Such situation can lead to a buffer overrun, resulting in     a heap memory corruption or an information disclosure from the heap.
    CVE-2017-0899     RubyGems version 2.6.12 and earlier is vulnerable to maliciously     crafted gem specifications that include terminal escape characters.
    Printing the gem specification would execute terminal escape     sequences.
    CVE-2017-0900     RubyGems version 2.6.12 and earlier is vulnerable to maliciously     crafted gem specifications to cause a denial of service attack against     RubyGems clients who have issued a `query` command.
    CVE-2017-0901     RubyGems version 2.6.12 and earlier fails to validate specification     names, allowing a maliciously crafted gem to potentially overwrite any     file on the filesystem.
    CVE-2017-0902     RubyGems version 2.6.12 and earlier is vulnerable to a DNS hijacking     vulnerability that allows a MITM attacker to force the RubyGems client     to download and install gems from a server that the attacker controls.
    CVE-2017-0903     RubyGems versions between 2.0.0 and 2.6.13 are vulnerable to a     possible remote code execution vulnerability. YAML deserialization of     gem specifications can bypass class white lists. Specially crafted     serialized objects can possibly be used to escalate to remote code     execution.
    CVE-2017-10784     The Basic authentication code in WEBrick library in Ruby before 2.2.8,     2.3.x before 2.3.5, and 2.4.x through 2.4.1 allows remote attackers to     inject terminal emulator escape sequences into its log and possibly     execute arbitrary commands via a crafted user name.
    CVE-2017-14033     The decode method in the OpenSSL::ASN1 module in Ruby before 2.2.8,     2.3.x before 2.3.5, and 2.4.x through 2.4.1 allows attackers to cause     a denial of service (interpreter crash) via a crafted string.
    CVE-2017-14064     Ruby through 2.2.7, 2.3.x through 2.3.4, and 2.4.x through 2.4.1 can     expose arbitrary memory during a JSON.generate call. The issues lies in     using strdup in ext/json/ext/generator/generator.c, which will stop     after encountering a '\0' byte, returning a pointer to a string of     length zero, which is not the length stored in space_len.
    CVE-2017-17405     Ruby before 2.4.3 allows Net::FTP command injection. Net::FTP#get,     getbinaryfile, gettextfile, put, putbinaryfile, and puttextfile use     Kernel#open to open a local file. If the localfile argument starts with     the | pipe character, the command following the pipe character is     executed. The default value of localfile is File.basename(remotefile),     so malicious FTP servers could cause arbitrary command execution.
    CVE-2017-17790     The lazy_initialize function in lib/resolv.rb in Ruby through 2.4.3     uses Kernel#open, which might allow Command Injection attacks, as     demonstrated by a Resolv::Hosts::new argument beginning with a '|'     character, a different vulnerability than CVE-2017-17405. NOTE:
    situations with untrusted input may be highly unlikely.

Tenable has extracted the preceding description block directly from the MiracleLinux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

ID	Name	Product	Family	Published	Updated	Severity
127164	NewStart CGSL MAIN 5.04 : ruby Multiple Vulnerabilities (NS-SA-2019-0013)	Nessus	NewStart CGSL Local Security Checks	8/12/2019	5/19/2022	critical
103341	Fedora 25 : ruby (2017-e136d63c99)	Nessus	Fedora Local Security Checks	9/20/2017	11/20/2025	critical
107080	Oracle Linux 7 : ruby (ELSA-2018-0378)	Nessus	Oracle Linux Local Security Checks	3/1/2018	11/1/2024	critical
111081	Debian DLA-1421-1 : ruby2.1 security update	Nessus	Debian Local Security Checks	7/16/2018	9/4/2024	critical
289384	MiracleLinux 7 : ruby-2.0.0.648-33.0.1.el7.AXS7 (AXSA:2018-2583:01)	Nessus	Miracle Linux Local Security Checks	1/16/2026	1/16/2026	critical

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