Rack::Session::Cookie in Rack 1.5.x before 1.5.2, 1.4.x before 1.4.5, 1.3.x before 1.3.10, 1.2.x before 1.2.8, and 1.1.x before 1.1.6 allows remote attackers to guess the session cookie, gain privileges, and execute arbitrary code via a timing attack involving an HMAC comparison function that does not run in constant time.

The remote Redhat Enterprise Linux 6 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2013:0638 advisory.

  - rubygem-rack: Path sanitization information disclosure (CVE-2013-0262)

  - rubygem-rack: Timing attack in cookie sessions (CVE-2013-0263)

  - jenkins: cross-site request forgery (CSRF) on Jenkins master (CVE-2013-0327)

  - jenkins: XSS (CVE-2013-0328)

  - jenkins: cross-site request forgery (CSRF) protection mechanism bypass (CVE-2013-0329)

  - jenkins: cause building jobs without direct access (CVE-2013-0330)

  - jenkins: denial of service attack by feeding a carefully crafted payload to Jenkins (CVE-2013-0331)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The Ruby on Rails 2.3 stack was updated to 2.3.17. The Ruby on Rails 3.2 stack was updated to 3.2.12.

The Ruby Rack was updated to 1.1.6. The Ruby Rack was updated to 1.2.8. The Ruby Rack was updated to 1.3.10. The Ruby Rack was updated to 1.4.5.

The updates fix various security issues and bugs.

  - update to version 2.3.17 (bnc#803336, bnc#803339)     CVE-2013-0276 CVE-2013-0277 :

  - update to version 3.2.12 (bnc#803336) CVE-2013-0276 :

  - update to version 3.2.12 (bnc#803336) CVE-2013-0276:
    issue with attr_protected where malformed input could     circumvent protection

  - update to version 2.3.17 (bnc#803336, bnc#803339)     CVE-2013-0276 CVE-2013-0277 :

  - Fix issue with attr_protected where malformed input     could circumvent protection

  - Fix Serialized Attributes YAML Vulnerability

  - update to version 2.3.17 (bnc#803336, bnc#803339)     CVE-2013-0276 CVE-2013-0277 :

  - Fix issue with attr_protected where malformed input     could circumvent protection

  - Fix Serialized Attributes YAML Vulnerability

  - update to version 3.2.12 (bnc#803336) CVE-2013-0276 :

  - Quote numeric values being compared to non-numeric     columns. Otherwise, in some database, the string column     values will be coerced to a numeric allowing 0, 0.0 or     false to match any string starting with a non-digit.

  - update to 1.1.6 (bnc#802794)

  - Fix CVE-2013-0263, timing attack against     Rack::Session::Cookie

  - update to 1.2.8 (bnc#802794)

  - Fix CVE-2013-0263, timing attack against     Rack::Session::Cookie

  - update to 1.3.10 (bnc#802794)

  - Fix CVE-2013-0263, timing attack against     Rack::Session::Cookie

  - ruby rack update to 1.4.5 (bnc#802794 bnc#802795)

  - Fix CVE-2013-0263, timing attack against     Rack::Session::Cookie

  - Fix CVE-2013-0262, symlink path traversal in Rack::File

  - ruby rack update to 1.4.4 (bnc#798452)

  - [SEC] Rack::Auth::AbstractRequest no longer symbolizes     arbitrary strings (CVE-2013-0184)

  - ruby rack changes from 1.4.3

  - Security: Prevent unbounded reads in large multipart     boundaries (CVE-2013-0183)

  - ruby rack changes from 1.4.2 (CVE-2012-6109)

  - Add warnings when users do not provide a session secret

  - Fix parsing performance for unquoted filenames

  - Updated URI backports

  - Fix URI backport version matching, and silence constant     warnings

  - Correct parameter parsing with empty values

  - Correct rackup '-I' flag, to allow multiple uses

  - Correct rackup pidfile handling

  - Report rackup line numbers correctly

  - Fix request loops caused by non-stale nonces with time     limits

  - Fix reloader on Windows

  - Prevent infinite recursions from Response#to_ary

  - Various middleware better conforms to the body close     specification

  - Updated language for the body close specification

  - Additional notes regarding ECMA escape compatibility     issues

  - Fix the parsing of multiple ranges in range headers

  - Prevent errors from empty parameter keys

  - Added PATCH verb to Rack::Request

  - Various documentation updates

  - Fix session merge semantics (fixes rack-test)

  - Rack::Static :index can now handle multiple directories

  - All tests now utilize Rack::Lint (special thanks to Lars     Gierth)

  - Rack::File cache_control parameter is now deprecated,     and removed by 1.5

  - Correct Rack::Directory script name escaping

  - Rack::Static supports header rules for sophisticated     configurations

  - Multipart parsing now works without a Content-Length     header

  - New logos courtesy of Zachary Scott!

  - Rack::BodyProxy now explicitly defines #each, useful for     C extensions

  - Cookies that are not URI escaped no longer cause     exceptions

The remote host is affected by the vulnerability described in GLSA-201405-10 (Rack: Multiple vulnerabilities)

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

    A remote attacker could possibly execute arbitrary code with the       privileges of the process, cause a Denial of Service condition, or obtain       sensitive information.
  Workaround :

    There is no known workaround at this time.

Several vulnerabilities were discovered in Rack, a modular Ruby webserver interface. The Common Vulnerabilites and Exposures project identifies the following vulnerabilities :

  - CVE-2011-5036     Rack computes hash values for form parameters without     restricting the ability to trigger hash collisions     predictably, which allows remote attackers to cause a     denial of service (CPU consumption) by sending many     crafted parameters.

  - CVE-2013-0183     A remote attacker could cause a denial of service     (memory consumption and out-of-memory error) via a long     string in a Multipart HTTP packet.

  - CVE-2013-0184     A vulnerability in Rack::Auth::AbstractRequest allows     remote attackers to cause a denial of service via     unknown vectors.

  - CVE-2013-0263     Rack::Session::Cookie allows remote attackers to guess     the session cookie, gain privileges, and execute     arbitrary code via a timing attack involving an HMAC     comparison function that does not run in constant time.

Patch for

  - path sanitization information disclosure (CVE-2013-0262)

    - timing attack in cookie sessions (CVE-2013-0263)

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

Rack developers report :

Today we are proud to announce the release of Rack 1.4.5.

Fix CVE-2013-0263, timing attack against Rack::Session::Cookie

Fix CVE-2013-0262, symlink path traversal in Rack::File

ID	Name	Product	Family	Severity
119433	RHEL 6 : Red Hat OpenShift Enterprise 1.1.2 update (Moderate) (RHSA-2013:0638)	Nessus	Red Hat Local Security Checks	medium
74900	openSUSE Security Update : RubyOnRails (openSUSE-SU-2013:0338-1)	Nessus	SuSE Local Security Checks	critical
74053	GLSA-201405-10 : Rack: Multiple vulnerabilities	Nessus	Gentoo Local Security Checks	medium
70534	Debian DSA-2783-1 : librack-ruby - several vulnerabilities	Nessus	Debian Local Security Checks	medium
66340	Fedora 17 : rubygem-rack-1.4.0-4.fc17 (2013-2315)	Nessus	Fedora Local Security Checks	medium
66339	Fedora 18 : rubygem-rack-1.4.0-5.fc18 (2013-2306)	Nessus	Fedora Local Security Checks	medium
64668	FreeBSD : Ruby Rack Gem -- Multiple Issues (fcfdabb7-f14d-4e61-a7d5-cfefb4b99b15)	Nessus	FreeBSD Local Security Checks	medium

Detections

Analytics

CVE-2013-0263

high

Tenable Plugins

medium

critical

medium

medium

medium

medium

medium