Vulnerability CVE-2015-9097
Published: 2017-06-12

Description:
The mail gem before 2.5.5 for Ruby (aka A Really Ruby Mail Library) 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.

CVSS2 => (AV:N/AC:M/Au:N/C:N/I:P/A:N)

CVSS Base Score
Impact Subscore
Exploitability Subscore
4.3/10
2.9/10
8.6/10
Exploit range
Attack complexity
Authentication
Remote
Medium
No required
Confidentiality impact
Integrity impact
Availability impact
None
Partial
None
Affected software
Mail project -> MAIL 

 References:
http://openwall.com/lists/oss-security/2015/12/11/3
http://www.mbsd.jp/Whitepaper/smtpi.pdf
https://github.com/mikel/mail/commit/72befdc4dab3e6e288ce226a7da2aa474cf5be83
https://github.com/mikel/mail/pull/1097
https://github.com/rubysec/ruby-advisory-db/issues/215
https://hackerone.com/reports/137631
https://rubysec.com/advisories/mail-OSVDB-131677
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