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[ GLSA 201009-07 ] libxml2: Denial of Service
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PostPosted: Tue Sep 21, 2010 10:26 pm    Post subject: [ GLSA 201009-07 ] libxml2: Denial of Service Reply with quote

Gentoo Linux Security Advisory

Title: libxml2: Denial of Service (GLSA 201009-07)
Severity: normal
Exploitable: remote
Date: September 21, 2010
Bug(s): #280617
ID: 201009-07

Synopsis


Multiple Denial of Services vulnerabilities were found in libxml2.


Background


libxml2 is a library to manipulate XML files.


Affected Packages

Package: dev-libs/libxml2
Vulnerable: < 2.7.3-r2
Unaffected: >= 2.7.3-r2
Architectures: All supported architectures


Description


The following vulnerabilities were reported after a test with the
Codenomicon XML fuzzing framework:

  • Two use-after-free vulnerabilities are possible when parsing a XML file
    with Notation or Enumeration attribute types (CVE-2009-2416).

  • A stack consumption vulnerability can be triggered via a large depth of
    element declarations in a DTD, related to a function recursion
    (CVE-2009-2414).


Impact


A remote attacker could entice a user or automated system to open a
specially crafted XML document with an application using libxml2
resulting in a Denial of Service condition.


Workaround


There is no known workaround at this time.


Resolution


All libxml2 users should upgrade to the latest version:
Code:
# emerge --sync
    # emerge --ask --oneshot --verbose ">=dev-libs/libxml2-2.7.3-r2"

NOTE: This is a legacy GLSA. Updates for all affected architectures are
available since August 30, 2009. It is likely that your system is
already no longer affected by this issue.


References

CVE-2009-2414
CVE-2009-2416
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