libxml2 - security update


* [CVE-2017-7375](https://security-tracker.debian.org/tracker/CVE-2017-7375) Missing validation for external entities in xmlParsePEReference * [CVE-2017-9047](https://security-tracker.debian.org/tracker/CVE-2017-9047) / [CVE-2017-9048](https://security-tracker.debian.org/tracker/CVE-2017-9048) 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. * [CVE-2017-9049](https://security-tracker.debian.org/tracker/CVE-2017-9049) / [CVE-2017-9050](https://security-tracker.debian.org/tracker/CVE-2017-9050) libxml2 20904-GITv2.9.4-16-g0741801 is vulnerable to a heap-based buffer over-read in the xmlDictComputeFastKey function in dict.c. This vulnerability causes programs that use libxml2, such as PHP, to crash. This vulnerability exists because of an incomplete fix for libxml2 Bug 759398. For Debian 7 Wheezy, these problems have been fixed in version 2.8.0+dfsg1-7+wheezy8. We recommend that you upgrade your libxml2 packages. Further information about Debian LTS security advisories, how to apply these updates to your system and frequently asked questions can be found at: <https://wiki.debian.org/LTS>

Affected Software

CPE Name Name Version
libxml2 2.8.0+dfsg1-7+nmu2
libxml2 2.8.0+dfsg1-7+wheezy6
libxml2 2.8.0+dfsg1-7+wheezy3
libxml2 2.8.0+dfsg1-7+nmu3
libxml2 2.8.0+dfsg1-7+wheezy5
libxml2 2.8.0+dfsg1-7+wheezy7
libxml2 2.8.0+dfsg1-7+wheezy1
libxml2 2.8.0+dfsg1-7+wheezy4
libxml2 2.8.0+dfsg1-7+nmu1
libxml2 2.8.0+dfsg1-7+wheezy2