U radu programskog paketa ruby uočeni su i ispravljeni višestruki nedostaci. Spomenute ranjivosti udaljeni napadač je mogao iskoristiti za umetanje HTML i skriptnog koda, izmjenu podataka, zaobilaženje postavljenih ograničenja, predviđanje vrijednosti slučajnih brojeva, proizvoljno izvršavanje programskog koda i izvođenje DoS napada.

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Ubuntu Security Notice USN-1377-1
February 28, 2012

ruby1.8 vulnerabilities
==========================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 11.10
- Ubuntu 11.04
- Ubuntu 10.10
- Ubuntu 10.04 LTS

Summary:

Several security issues were fixed in ruby1.8.

Software Description:
- ruby1.8: Interpreter of object-oriented scripting language Ruby 1.8

Details:

Drew Yao discovered that the WEBrick HTTP server was vulnerable to cross-site
scripting attacks when displaying error pages. A remote attacker could use this
flaw to run arbitrary web script. (CVE-2010-0541)

Drew Yao discovered that Ruby's BigDecimal module did not properly allocate
memory on 64-bit platforms. An attacker could use this flaw to cause a denial
of service or possibly execute arbitrary code with user privileges.
(CVE-2011-0188)

Nicholas Jefferson discovered that the FileUtils.remove_entry_secure method in
Ruby did not properly remove non-empty directories. An attacker could use this
flaw to possibly delete arbitrary files. (CVE-2011-1004)

It was discovered that Ruby incorrectly allowed untainted strings to be
modified in protective safe levels. An attacker could use this flaw to bypass
intended access restrictions. (CVE-2011-1005)

Eric Wong discovered that Ruby does not properly reseed its pseudorandom number
generator when creating child processes. An attacker could use this flaw to
gain knowledge of the random numbers used in other Ruby child processes.
(CVE-2011-2686)

Eric Wong discovered that the SecureRandom module in Ruby did not properly seed
its pseudorandom number generator. An attacker could use this flaw to gain
knowledge of the random numbers used by another Ruby process with the same
process ID number. (CVE-2011-2705)

Alexander Klink and Julian Wälde discovered that Ruby computed hash values
without restricting the ability to trigger hash collisions predictably. A
remote attacker could cause a denial of service by crafting values used in hash
tables. (CVE-2011-4815)

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 11.10:
  libruby1.8                      1.8.7.352-2ubuntu0.1
  ruby1.8                         1.8.7.352-2ubuntu0.1

Ubuntu 11.04:
  libruby1.8                      1.8.7.302-2ubuntu0.1
  ruby1.8                         1.8.7.302-2ubuntu0.1

Ubuntu 10.10:
  libruby1.8                      1.8.7.299-2ubuntu0.1
  ruby1.8                         1.8.7.299-2ubuntu0.1

Ubuntu 10.04 LTS:
  libruby1.8                      1.8.7.249-2ubuntu0.1
  ruby1.8                         1.8.7.249-2ubuntu0.1

In general, a standard system update will make all the necessary changes.

References:
  http://www.ubuntu.com/usn/usn-1377-1
  CVE-2010-0541, CVE-2011-0188, CVE-2011-1004, CVE-2011-1005,
  CVE-2011-2686, CVE-2011-2705, CVE-2011-4815

Package Information:
  https://launchpad.net/ubuntu/+source/ruby1.8/1.8.7.352-2ubuntu0.1
  https://launchpad.net/ubuntu/+source/ruby1.8/1.8.7.302-2ubuntu0.1
  https://launchpad.net/ubuntu/+source/ruby1.8/1.8.7.299-2ubuntu0.1
  https://launchpad.net/ubuntu/+source/ruby1.8/1.8.7.249-2ubuntu0.1