http://blog.rubygems.org/2017/08/27/2.6.13-released.html

100586

1039249

RHSA-2017:3485

RHSA-2018:0378

RHSA-2018:0583

RHSA-2018:0585

https://github.com/rubygems/rubygems/commit/8d91516fb7037ecfb27622f605dc40245e0f8d32

https://hackerone.com/reports/218088

[debian-lts-announce] 20180714 [SECURITY] [DLA 1421-1] ruby2.1 security update

GLSA-201710-01

USN-3553-1

USN-3685-1

DSA-3966

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

  - 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.(CVE-2017-17790)

  - 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)

  - 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 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)

  - 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 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)

  - 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)

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.

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.

Some of these CVE were already addressed in previous USN: 3439-1, 3553-1, 3528-1. Here we address for the remain releases.

It was discovered that Ruby incorrectly handled certain inputs. An attacker could use this to cause a buffer overrun. (CVE-2017-0898)

It was discovered that Ruby incorrectly handled certain files. An attacker could use this to overwrite any file on the filesystem.
(CVE-2017-0901)

It was discovered that Ruby was vulnerable to a DNS hijacking vulnerability. An attacker could use this to possibly force the RubyGems client to download and install gems from a server that the attacker controls. (CVE-2017-0902)

It was discovered that Ruby incorrectly handled certain YAML files. An attacker could use this to possibly execute arbitrary code.
(CVE-2017-0903)

It was discovered that Ruby incorrectly handled certain files. An attacker could use this to expose sensitive information.
(CVE-2017-14064)

It was discovered that Ruby incorrectly handled certain inputs. An attacker could use this to execute arbitrary code. (CVE-2017-10784)

It was discovered that Ruby incorrectly handled certain network requests. An attacker could possibly use this to inject a crafted key into a HTTP response. (CVE-2017-17742)

It was discovered that Ruby incorrectly handled certain files. An attacker could possibly use this to execute arbitrary code. This update is only addressed to ruby2.0. (CVE-2018-1000074)

It was discovered that Ruby incorrectly handled certain network requests. An attacker could possibly use this to cause a denial of service. (CVE-2018-8777).

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

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.

An update for ruby is now available for Red Hat Enterprise Linux 7.

Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

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

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. (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)

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.
    (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)

From Red Hat Security Advisory 2018:0378 :

An update for ruby is now available for Red Hat Enterprise Linux 7.

Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

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

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. (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)

It was discovered that Ruby failed to validate specification names. An attacker could possibly use a maliciously crafted gem to potentially overwrite any file on the filesystem. (CVE-2017-0901)

It was discovered that Ruby was vulnerable to a DNS hijacking vulnerability. An attacker could use this to possibly force the RubyGems client to download and install gems from a server that the attacker controls. (CVE-2017-0902)

It was discovered that Ruby incorrectly handled certain YAML files. An attacker could use this to possibly execute arbitrary code.
(CVE-2017-0903).

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

Update to RubyGems 2.6.13.

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.

Arbitrary heap exposure during a JSON.generate call

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-2017-14064)

Escape sequence injection vulnerability in the Basic authentication of WEBrick

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-2017-10784)

Buffer underrun in OpenSSL ASN1 decode

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-2017-14033)

No size limit in summary length of gem spec

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-2017-0900)

Arbitrary file overwrite due to incorrect validation of specification name

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-2017-0901)

DNS hijacking vulnerability

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-2017-0902)

Buffer underrun vulnerability in Kernel.sprintf

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-2017-0898)

Escape sequence in the 'summary' field of gemspec

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-2017-0899)

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)

The remote host is affected by the vulnerability described in GLSA-201710-01 (RubyGems: Multiple vulnerabilities)

    Multiple vulnerabilities have been discovered in RubyGems. Please review       the referenced CVE identifiers for details.
  Impact :

    A remote attacker, by enticing a user to install a specially crafted       gem, could possibly execute arbitrary code with the privileges of the       process or cause a Denial of Service condition.
  Workaround :

    There is no known workaround at this time.

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

A SMTP command injection flaw was found in the way Ruby's Net::SMTP module handled CRLF sequences in certain SMTP commands. An attacker could potentially use this flaw to inject SMTP commands in a SMTP session in order to facilitate phishing attacks or spam campaigns.
(CVE-2015-9096)

Escape sequence injection vulnerability in the Basic authentication of WEBrick

The Basic authentication code in WEBrick library in Ruby allows remote attackers to inject terminal emulator escape sequences into its log and possibly execute arbitrary commands via a crafted user name.
(CVE-2017-10784)

Buffer underrun in OpenSSL ASN1 decode

The decode method in the OpenSSL::ASN1 module in Ruby allows attackers to cause a denial of service (interpreter crash) via a crafted string.
(CVE-2017-14033)

No size limit in summary length of gem spec

RubyGems is vulnerable to maliciously crafted gem specifications to cause a denial of service attack against RubyGems clients who have issued a `query` command. (CVE-2017-0900)

Arbitrary file overwrite due to incorrect validation of specification name

RubyGems fails to validate specification names, allowing a maliciously crafted gem to potentially overwrite any file on the filesystem.
(CVE-2017-0901)

DNS hijacking vulnerability

RubyGems 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-2017-0902)

Buffer underrun vulnerability in Kernel.sprintf

Ruby 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-2017-0898)

Escape sequence in the 'summary' field of gemspec

RubyGems is vulnerable to maliciously crafted gem specifications that include terminal escape characters. Printing the gem specification would execute terminal escape sequences. (CVE-2017-0899)

Arbitrary heap exposure during a JSON.generate call

Ruby 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-2017-14064)

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)

- 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.

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

Multiple vulnerabilities were discovered in the interpreter for the Ruby language :

  - CVE-2015-9096     SMTP command injection in Net::SMTP.

  - CVE-2016-7798     Incorrect handling of initialization vector in the GCM     mode in the OpenSSL extension.

  - CVE-2017-0900     Denial of service in the RubyGems client.

  - CVE-2017-0901     Potential file overwrite in the RubyGems client.

  - CVE-2017-0902     DNS hijacking in the RubyGems client.

  - CVE-2017-14064     Heap memory disclosure in the JSON library.

ID	Name	Product	Family	Severity
117557	EulerOS Virtualization 2.5.0 : ruby (EulerOS-SA-2018-1248)	Nessus	Huawei Local Security Checks	high
111081	Debian DLA-1421-1 : ruby2.1 security update	Nessus	Debian Local Security Checks	high
110551	Ubuntu 14.04 LTS / 16.04 LTS / 17.10 : ruby1.9.1, ruby2.0, ruby2.3 vulnerabilities (USN-3685-1)	Nessus	Ubuntu Local Security Checks	high
108471	EulerOS 2.0 SP2 : ruby (EulerOS-SA-2018-1067)	Nessus	Huawei Local Security Checks	high
108470	EulerOS 2.0 SP1 : ruby (EulerOS-SA-2018-1066)	Nessus	Huawei Local Security Checks	high
107270	CentOS 7 : ruby (CESA-2018:0378)	Nessus	CentOS Local Security Checks	high
107084	Scientific Linux Security Update : ruby on SL7.x x86_64	Nessus	Scientific Linux Local Security Checks	high
107082	RHEL 7 : ruby (RHSA-2018:0378)	Nessus	Red Hat Local Security Checks	high
107080	Oracle Linux 7 : ruby (ELSA-2018-0378)	Nessus	Oracle Linux Local Security Checks	high
106557	Ubuntu 16.04 LTS / 17.10 : ruby2.3 vulnerabilities (USN-3553-1)	Nessus	Ubuntu Local Security Checks	high
105917	Fedora 27 : rubygems (2017-81cf93b7c2)	Nessus	Fedora Local Security Checks	high
104181	Amazon Linux AMI : ruby24 (ALAS-2017-915)	Nessus	Amazon Linux Local Security Checks	high
103719	GLSA-201710-01 : RubyGems: Multiple vulnerabilities	Nessus	Gentoo Local Security Checks	high
103603	Amazon Linux AMI : ruby22 / ruby23 (ALAS-2017-906)	Nessus	Amazon Linux Local Security Checks	high
103341	Fedora 25 : ruby (2017-e136d63c99)	Nessus	Fedora Local Security Checks	high
103308	Slackware 14.2 / current : ruby (SSA:2017-261-03)	Nessus	Slackware Local Security Checks	high
103099	Fedora 26 : rubygems (2017-20214ad330)	Nessus	Fedora Local Security Checks	high
102964	Debian DSA-3966-1 : ruby2.3 - security update	Nessus	Debian Local Security Checks	high

CVE-2017-0902

Description

References

Details

Risk Information

CVSS v2.0

CVSS v3.0

Vulnerable Software

Configuration 1

Tenable Plugins