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Vigil@nce - libxml2: infinite loop of xmlStringGetNodeList__internal_alias

April 2016 by Vigil@nce

This bulletin was written by Vigil@nce : https://vigilance.fr/offer

SYNTHESIS OF THE VULNERABILITY

An attacker can generate an infinite recursion in
xmlStringGetNodeList__internal_alias() of libxml2, in order to
trigger a denial of service.

 Impacted products: libxml2.
 Severity: 1/4.
 Creation date: 21/03/2016.

DESCRIPTION OF THE VULNERABILITY

The xmllint tool of libxml2 has the option "—recover" to try to
decode a malformed XML document.

However, a malformed document triggers an infinite recursion in
the xmlStringGetNodeList__internal_alias() function, which
depletes the stack.

An attacker can therefore generate an infinite recursion in
xmlStringGetNodeList__internal_alias() of libxml2, in order to
trigger a denial of service.

ACCESS TO THE COMPLETE VIGIL@NCE BULLETIN

https://vigilance.fr/vulnerability/libxml2-infinite-loop-of-xmlStringGetNodeList-internal-alias-19201


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