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CVE-2017-9047 PUBLISHED

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.

EPSS 2.40% · 84.9th percentile

Risk Scores

EPSS Score
2.40%
84.9th percentile

Affected Products

VendorProductVersions
Ubuntu:14.04:LTSlibxml20, 2.9.1+dfsg1-3ubuntu2, 2.9.1+dfsg1-3ubuntu3
Ubuntu:16.04:LTSlibxml20, 2.9.2+zdfsg1-4, 2.9.2+zdfsg1-4ubuntu1

Timeline

References

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