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Out-of-Bounds Affecting libxml2 package, versions <2.9.1+dfsg1-5+deb8u5

0.0
high

Snyk CVSS

    Attack Complexity Low
    Availability High

    Threat Intelligence

    EPSS 0.29% (69th percentile)
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NVD
7.5 high
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Red Hat
7.5 high

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  • Snyk ID SNYK-DEBIAN8-LIBXML2-429301
  • published 18 May 2017
  • disclosed 18 May 2017
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Introduced: 18 May 2017

CVE-2017-9047 Open this link in a new tab
CWE-119 Open this link in a new tab

How to fix?

Upgrade Debian:8 libxml2 to version 2.9.1+dfsg1-5+deb8u5 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream libxml2 package and not the libxml2 package as distributed by Debian. See How to fix? for Debian:8 relevant fixed versions and status.

A buffer overflow was discovered in libxml2 20904-GITv2.9.4-16-g0741801. The function xmlSnprintfElementContent in valid.c is supposed to recursively dump the element content definition into a char buffer 'buf' of size 'size'. The variable len is assigned strlen(buf). If the content->type is XML_ELEMENT_CONTENT_ELEMENT, then (i) the content->prefix is appended to buf (if it actually fits) whereupon (ii) content->name is written to the buffer. However, the check for whether the content->name actually fits also uses 'len' rather than the updated buffer length strlen(buf). This allows us to write about "size" many bytes beyond the allocated memory. This vulnerability causes programs that use libxml2, such as PHP, to crash.

References