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AUSCERT External Security Bulletin Redistribution
ruby2.1 security update
16 July 2018
AusCERT Security Bulletin Summary
Operating System: Debian GNU/Linux 8
Impact/Access: Execute Arbitrary Code/Commands -- Remote with User Interaction
Create Arbitrary Files -- Remote/Unauthenticated
Denial of Service -- Remote/Unauthenticated
Cross-site Scripting -- Remote with User Interaction
Provide Misleading Information -- Remote with User Interaction
Access Confidential Data -- Remote with User Interaction
Reduced Security -- Remote with User Interaction
CVE Names: CVE-2018-1000079 CVE-2018-1000078 CVE-2018-1000077
CVE-2018-1000076 CVE-2018-1000075 CVE-2018-8780
CVE-2018-8779 CVE-2018-8778 CVE-2018-8777
CVE-2018-6914 CVE-2017-17790 CVE-2017-17742
CVE-2017-17405 CVE-2017-14064 CVE-2017-14033
CVE-2017-10784 CVE-2017-0903 CVE-2017-0902
CVE-2017-0901 CVE-2017-0900 CVE-2017-0899
CVE-2017-0898 CVE-2016-7798 CVE-2016-2339
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Package : ruby2.1
Version : 2.1.5-2+deb8u4
CVE ID : CVE-2015-9096 CVE-2016-2339 CVE-2016-7798 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-2017-17742 CVE-2017-17790 CVE-2018-6914
CVE-2018-8777 CVE-2018-8778 CVE-2018-8779 CVE-2018-8780
CVE-2018-1000075 CVE-2018-1000076 CVE-2018-1000077
Debian Bug : 851161
Multiple vulnerabilities were found in the interpreter for the Ruby
language. The Common Vulnerabilities and Exposures project identifies the
SMTP command injection in Net::SMTP via CRLF sequences in a RCPT TO
or MAIL FROM command.
Exploitable heap overflow in Fiddle::Function.new.
Incorrect handling of initialization vector in the GCM mode in the
Buffer underrun vulnerability in Kernel.sprintf.
ANSI escape sequence vulnerability in RubyGems.
DoS vulnerability in the RubyGems query command.
gem installer allowed a malicious gem to overwrite arbitrary files.
RubyGems DNS request hijacking vulnerability.
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.
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.
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.
Heap memory disclosure in the JSON library.
A command injection vulnerability in Net::FTP might allow a
malicious FTP server to execute arbitrary commands.
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.
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.
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.
Eric Wong reported an out-of-memory DoS vulnerability related to a
large request in WEBrick bundled with Ruby.
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.
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
ooooooo_q discovered an unintentional directory traversal in
some methods in Dir, by the lack of checking for NUL bytes in their
A negative size vulnerability in ruby gem package tar header that could
cause an infinite loop.
RubyGems package improperly verifies cryptographic signatures. A mis-signed
gem could be installed if the tarball contains multiple gem signatures.
An improper input validation vulnerability in RubyGems specification
homepage attribute could allow malicious gem to set an invalid homepage
Cross Site Scripting (XSS) vulnerability in gem server display of homepage
Path Traversal vulnerability during gem installation.
For Debian 8 "Jessie", these problems have been fixed in version
We recommend that you upgrade your ruby2.1 packages.
Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://wiki.debian.org/LTS
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