Debian DLA-1421-1 : ruby2.1 security update
High Nessus Plugin ID 111081
SynopsisThe remote Debian host is missing a security update.
DescriptionMultiple vulnerabilities were found in the interpreter for the Ruby language. The Common Vulnerabilities and Exposures project identifies the following issues :
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 OpenSSL extension.
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 access.
ooooooo_q discovered an unintentional directory traversal in some methods in Dir, by the lack of checking for NUL bytes in their parameter.
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 URL.
Cross Site Scripting (XSS) vulnerability in gem server display of homepage attribute.
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.
SolutionUpgrade the affected packages.