||Net::SMTP in Ruby before 2.4.0 is vulnerable to SMTP command injection via CRLF sequences in a RCPT TO or MAIL FROM command, as demonstrated by CRLF sequences immediately before and after a DATA substring.
|Base: ||4.3 |
An attack of this type exploits a programs' vulnerabilities that allows an attacker's commands to be concatenated onto a legitimate command with the intent of targeting other resources such as the file system or database. The system that uses a filter or a blacklist input validation, as opposed to whitelist validation is vulnerable to an attacker who predicts delimiters (or combinations of delimiters) not present in the filter or blacklist. As with other injection attacks, the attacker uses the command delimiter payload as an entry point to tunnel through the application and activate additional attacks through SQL queries, shell commands, network scanning, and so on.
Web Logs Tampering
Web Logs Tampering attacks involve an attacker injecting, deleting or otherwise tampering with the contents of web logs typically for the purposes of masking other malicious behavior. Additionally, writing malicious data to log files may target jobs, filters, reports, and other agents that process the logs in an asynchronous attack pattern. This pattern of attack is similar to "Log Injection-Tampering-Forging" except that in this case, the attack is targeting the logs of the web server and not the application.
|NASL family||Debian Local Security Checks |
|NASL id||DEBIAN_DLA-1421.NASL |
|description||Multiple 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. |
|last seen||2018-09-01 |
|plugin id||111081 |
|title||Debian DLA-1421-1 : ruby2.1 security update |
|NASL family||Fedora Local Security Checks |
|NASL id||FEDORA_2017-F318871E3B.NASL |
|description||- Update to Ruby 2.3.4.
- Fix SMTP command injection via CRLF sequences in RCPT TO or MAIL FROM commands in Net::SMTP (CVE-2015-9096).
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. |
|last seen||2018-09-01 |
|plugin id||102722 |
|title||Fedora 25 : ruby (2017-f318871e3b) |
|NASL family||Ubuntu Local Security Checks |
|NASL id||UBUNTU_USN-3365-1.NASL |
|description||It was discovered that Ruby DL::dlopen incorrectly handled opening libraries. An attacker could possibly use this issue to open libraries with tainted names. This issue only applied to Ubuntu 14.04 LTS.
Tony Arcieri, Jeffrey Walton, and Steffan Ullrich discovered that the Ruby OpenSSL extension incorrectly handled hostname wildcard matching.
This issue only applied to Ubuntu 14.04 LTS. (CVE-2015-1855)
Christian Hofstaedtler discovered that Ruby Fiddle::Handle incorrectly handled certain crafted strings. An attacker could use this issue to cause a denial of service, or possibly execute arbitrary code. This issue only applied to Ubuntu 14.04 LTS. (CVE-2015-7551)
It was discovered that Ruby Net::SMTP incorrectly handled CRLF sequences. A remote attacker could possibly use this issue to inject SMTP commands. (CVE-2015-9096)
Marcin Noga discovered that Ruby incorrectly handled certain arguments in a TclTkIp class method. An attacker could possibly use this issue to execute arbitrary code. This issue only affected Ubuntu 14.04 LTS.
It was discovered that Ruby Fiddle::Function.new incorrectly handled certain arguments. An attacker could possibly use this issue to execute arbitrary code. This issue only affected Ubuntu 14.04 LTS.
It was discovered that Ruby incorrectly handled the initialization vector (IV) in GCM mode. An attacker could possibly use this issue to bypass encryption. (CVE-2016-7798).
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. |
|last seen||2018-12-02 |
|plugin id||101974 |
|title||Ubuntu 14.04 LTS / 16.04 LTS / 17.04 : ruby1.9.1, ruby2.0, ruby2.3 vulnerabilities (USN-3365-1) |
|NASL family||Debian Local Security Checks |
|NASL id||DEBIAN_DSA-3966.NASL |
|description||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. |
|last seen||2018-11-13 |
|plugin id||102964 |
|title||Debian DSA-3966-1 : ruby2.3 - security update |
|NASL family||Amazon Linux Local Security Checks |
|NASL id||ALA_ALAS-2017-906.NASL |
|description||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.
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.
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.
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.
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) |
|last seen||2018-09-01 |
|plugin id||103603 |
|title||Amazon Linux AMI : ruby22 / ruby23 (ALAS-2017-906) |
|Last major update
||12-06-2017 - 16:29
||12-06-2017 - 16:29
||14-07-2018 - 21:29