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.

Ruby blog :

CVE-2017-0898: Buffer underrun vulnerability in Kernel.sprintf

If a malicious format string which contains a precious specifier (*) is passed and a huge minus value is also passed to the specifier, buffer underrun may be caused. In such situation, the result may contains heap, or the Ruby interpreter may crash.

CVE-2017-10784: Escape sequence injection vulnerability in the Basic authentication of WEBrick

When using the Basic authentication of WEBrick, clients can pass an arbitrary string as the user name. WEBrick outputs the passed user name intact to its log, then an attacker can inject malicious escape sequences to the log and dangerous control characters may be executed on a victim's terminal emulator.

This vulnerability is similar to a vulnerability already fixed, but it had not been fixed in the Basic authentication.

CVE-2017-14033: Buffer underrun vulnerability in OpenSSL ASN1 decode

If a malicious string is passed to the decode method of OpenSSL::ASN1, buffer underrun may be caused and the Ruby interpreter may crash.

CVE-2017-14064: Heap exposure vulnerability in generating JSON

The generate method of JSON module optionally accepts an instance of JSON::Ext::Generator::State class. If a malicious instance is passed, the result may include contents of heap.

According to the versions of the ruby packages installed, the EulerOS installation on the remote host is affected by the following vulnerabilities :

  - 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)

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

New ruby packages are available for Slackware 14.2 and -current to fix security issues.

This update for ruby2.1 fixes the following issues :

Security issues fixed :

CVE-2015-9096: Fixed an SMTP command injection via CRLFsequences in a RCPT TO or MAIL FROM command (bsc#1043983).

CVE-2016-7798: Fixed an IV Reuse in GCM Mode (bsc#1055265).

CVE-2017-0898: Fixed a buffer underrun vulnerability in Kernel.sprintf (bsc#1058755).

CVE-2017-0899: Fixed an issue with malicious gem specifications, insufficient sanitation when printing gem specifications could have included terminal characters (bsc#1056286).

CVE-2017-0900: Fixed an issue with malicious gem specifications, the query command could have led to a denial of service attack against clients (bsc#1056286).

CVE-2017-0901: Fixed an issue with malicious gem specifications, potentially overwriting arbitrary files on the client system (bsc#1056286).

CVE-2017-0902: Fixed an issue with malicious gem specifications, that could have enabled MITM attacks against clients (bsc#1056286).

CVE-2017-0903: Fixed an unsafe object deserialization vulnerability (bsc#1062452).

CVE-2017-9228: Fixed a heap out-of-bounds write in bitset_set_range() during regex compilation (bsc#1069607).

CVE-2017-9229: Fixed an invalid pointer dereference in left_adjust_char_head() in oniguruma (bsc#1069632).

CVE-2017-10784: Fixed an escape sequence injection vulnerability in the Basic authentication of WEBrick (bsc#1058754).

CVE-2017-14033: Fixed a buffer underrun vulnerability in OpenSSL ASN1 decode (bsc#1058757).

CVE-2017-14064: Fixed an arbitrary memory exposure during a JSON.generate call (bsc#1056782).

CVE-2017-17405: Fixed a command injection vulnerability in Net::FTP (bsc#1073002).

CVE-2017-17742: Fixed an HTTP response splitting issue in WEBrick (bsc#1087434).

CVE-2017-17790: Fixed a command injection in lib/resolv.rb:lazy_initialize() (bsc#1078782).

CVE-2018-6914: Fixed an unintentional file and directory creation with directory traversal in tempfile and tmpdir (bsc#1087441).

CVE-2018-8777: Fixed a potential DoS caused by large requests in WEBrick (bsc#1087436).

CVE-2018-8778: Fixed a buffer under-read in String#unpack (bsc#1087433).

CVE-2018-8779: Fixed an unintentional socket creation by poisoned NUL byte in UNIXServer and UNIXSocket (bsc#1087440).

CVE-2018-8780: Fixed an unintentional directory traversal by poisoned NUL byte in Dir (bsc#1087437).

CVE-2018-16395: Fixed an issue with OpenSSL::X509::Name equality checking (bsc#1112530).

CVE-2018-16396: Fixed an issue with tainted string handling, where the flag was not propagated in Array#pack and String#unpack with some directives (bsc#1112532).

CVE-2018-1000073: Fixed a path traversal issue (bsc#1082007).

CVE-2018-1000074: Fixed an unsafe object deserialization vulnerability in gem owner, allowing arbitrary code execution with specially crafted YAML (bsc#1082008).

CVE-2018-1000075: Fixed an infinite loop vulnerability due to negative size in tar header causes Denial of Service (bsc#1082014).

CVE-2018-1000076: Fixed an improper verification of signatures in tarballs (bsc#1082009).

CVE-2018-1000077: Fixed an improper URL validation in the homepage attribute of ruby gems (bsc#1082010).

CVE-2018-1000078: Fixed a XSS vulnerability in the homepage attribute when displayed via gem server (bsc#1082011).

CVE-2018-1000079: Fixed a path traversal issue during gem installation allows to write to arbitrary filesystem locations (bsc#1082058).

CVE-2019-8320: Fixed a directory traversal issue when decompressing tar files (bsc#1130627).

CVE-2019-8321: Fixed an escape sequence injection vulnerability in verbose (bsc#1130623).

CVE-2019-8322: Fixed an escape sequence injection vulnerability in gem owner (bsc#1130622).

CVE-2019-8323: Fixed an escape sequence injection vulnerability in API response handling (bsc#1130620).

CVE-2019-8324: Fixed an issue with malicious gems that may have led to arbitrary code execution (bsc#1130617).

CVE-2019-8325: Fixed an escape sequence injection vulnerability in errors (bsc#1130611).

CVE-2019-15845: Fixed a NUL injection vulnerability in File.fnmatch and File.fnmatch? (bsc#1152994).

CVE-2019-16201: Fixed a regular expression denial of service vulnerability in WEBrick's digest access authentication (bsc#1152995).

CVE-2019-16254: Fixed an HTTP response splitting vulnerability in WEBrick (bsc#1152992).

CVE-2019-16255: Fixed a code injection vulnerability in Shell#[] and Shell#test (bsc#1152990).

CVE-2020-10663: Fixed an unsafe object creation vulnerability in JSON (bsc#1171517).

Non-security issue fixed :

Add conflicts to libruby to make sure ruby and ruby-stdlib are also updated when libruby is updated (bsc#1048072).

Also yast2-ruby-bindings on SLES 12 SP2 LTSS was updated to handle the updated ruby interpreter. (bsc#1172275)

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

The remote Redhat Enterprise Linux 6 / 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2018:0583 advisory.

    Ruby is an extensible, interpreted, object-oriented, scripting language. It has features to process text     files and to perform system management tasks.

    The following packages have been upgraded to a later upstream version: rh-ruby22-ruby (2.2.9), rh-     ruby22-rubygems (2.4.5.4), rh-ruby22-rubygem-psych (2.0.8.1), rh-ruby22-rubygem-json (1.8.1.1).
    (BZ#1549646)

    Security Fix(es):

    * ruby: Command injection vulnerability in Net::FTP (CVE-2017-17405)

    * ruby: Buffer underrun vulnerability in Kernel.sprintf (CVE-2017-0898)

    * rubygems: Arbitrary file overwrite due to incorrect validation of specification name (CVE-2017-0901)

    * rubygems: DNS hijacking vulnerability (CVE-2017-0902)

    * rubygems: Unsafe object deserialization through YAML formatted gem specifications (CVE-2017-0903)

    * ruby: Escape sequence injection vulnerability in the Basic authentication of WEBrick (CVE-2017-10784)

    * ruby: Buffer underrun in OpenSSL ASN1 decode (CVE-2017-14033)

    * ruby: DL::dlopen could open a library with tainted library name (CVE-2009-5147, CVE-2015-7551)

    * rubygems: Escape sequence in the summary field of gemspec (CVE-2017-0899)

    * rubygems: No size limit in summary length of gem spec (CVE-2017-0900)

    * ruby: Arbitrary heap exposure during a JSON.generate call (CVE-2017-14064)

    * ruby: Command injection in lib/resolv.rb:lazy_initialize() allows arbitrary code execution     (CVE-2017-17790)

    For more details about the security issue(s), including the impact, a CVSS score, and other related     information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise 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.

The remote Redhat Enterprise Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2018:0378 advisory.

  - ruby: Buffer underrun vulnerability in Kernel.sprintf (CVE-2017-0898)

  - rubygems: Escape sequence in the summary field of gemspec (CVE-2017-0899)

  - rubygems: No size limit in summary length of gem spec (CVE-2017-0900)

  - rubygems: Arbitrary file overwrite due to incorrect validation of specification name (CVE-2017-0901)

  - rubygems: DNS hijacking vulnerability (CVE-2017-0902)

  - rubygems: Unsafe object deserialization through YAML formatted gem specifications (CVE-2017-0903)

  - ruby: Escape sequence injection vulnerability in the Basic authentication of WEBrick (CVE-2017-10784)

  - ruby: Buffer underrun in OpenSSL ASN1 decode (CVE-2017-14033)

  - ruby: Arbitrary heap exposure during a JSON.generate call (CVE-2017-14064)

  - ruby: Command injection vulnerability in Net::FTP (CVE-2017-17405)

  - ruby: Command injection in lib/resolv.rb:lazy_initialize() allows arbitrary code execution     (CVE-2017-17790)

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

ID	名前	製品	ファミリー	公開日	更新日	深刻度
289384	MiracleLinux 7 : ruby-2.0.0.648-33.0.1.el7.AXS7 (AXSA:2018-2583:01)	Nessus	Miracle Linux Local Security Checks	2026/1/16	2026/1/16	critical
103345	FreeBSD : ruby -- multiple vulnerabilities (95b01379-9d52-11e7-a25c-471bafc3262f)	Nessus	FreeBSD Local Security Checks	2017/9/20	2025/11/20	critical
108470	EulerOS 2.0 SP1 : ruby (EulerOS-SA-2018-1066)	Nessus	Huawei Local Security Checks	2018/3/20	2025/1/28	critical
103308	Slackware 14.2 / current : ruby (SSA:2017-261-03)	Nessus	Slackware Local Security Checks	2017/9/19	2025/11/20	critical
137599	SUSE SLES12 Security Update : ruby2.1 (SUSE-SU-2020:1570-1)	Nessus	SuSE Local Security Checks	2020/6/18	2022/5/13	critical
194057	RHEL 6 / 7 : rh-ruby22-ruby (RHSA-2018:0583)	Nessus	Red Hat Local Security Checks	2024/4/27	2025/4/15	critical
107082	RHEL 7 : ruby (RHSA-2018:0378)	Nessus	Red Hat Local Security Checks	2018/3/1	2025/10/27	critical

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