Debian Security Advisory DSA 2783-1 (librack-ruby - several vulnerabilities)

Published: 2013-10-20 22:00:00
CVE Author: NIST National Vulnerability Database

CVSS Base Vector:
AV:N/AC:H/Au:N/C:P/I:P/A:P

Affected Versions:
librack-ruby on Debian Linux

Recommendations:
For the oldstable distribution (squeeze), these problems have been fixed in version 1.1.0-4+squeeze1. The stable, testing and unstable distributions do not contain the librack-ruby Linux Distribution Package. They have already been addressed in version 1.4.1-2.1 of the ruby-rack Linux Distribution Package. We recommend that you upgrade your librack-ruby Linux Distribution Packages.

Summary:
Several vulnerabilities were discovered in Rack, a modular Ruby webserver interface. The Common Vulnerabilities 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.

Detection Method:
This check tests the installed software version using the apt Linux Distribution Package manager.

Detection Type:
Linux Distribution Package

Solution Type:
Vendor Patch

NIST (National Institute of Standards and Technology) NVD (National Vulnerability Database)

https://nvd.nist.gov/vuln/detail/CVE-2011-5036
https://nvd.nist.gov/vuln/detail/CVE-2013-0183
https://nvd.nist.gov/vuln/detail/CVE-2013-0184
https://nvd.nist.gov/vuln/detail/CVE-2013-0263

References:

http://www.debian.org/security/2013/dsa-2783.html

Severity
Medium
CVSS Score
5.1
Published
2013-10-20
Modified
2019-03-18
Category
Debian Local Security Checks

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