Stack-based Buffer Overflow in xmlSnprintfElementContent in libxml2 20904-GITv2.9.4-16-g0741801

CVE-2017-9048 · MEDIUM Severity

AV:N/AC:L/AU:N/C:N/I:N/A:P

libxml2 20904-GITv2.9.4-16-g0741801 is vulnerable to a stack-based buffer overflow. The function xmlSnprintfElementContent in valid.c is supposed to recursively dump the element content definition into a char buffer 'buf' of size 'size'. At the end of the routine, the function may strcat two more characters without checking whether the current strlen(buf) + 2 < size. This vulnerability causes programs that use libxml2, such as PHP, to crash.

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