Debian LTS Advisory ([SECURITY] [DLA 1008-1] libxml2 security update)

Published: 2018-01-28 23:00:00
CVE Author: NIST National Vulnerability Database

CVSS Base Vector:
AV:N/AC:L/Au:N/C:P/I:P/A:P

Solution Type:
Vendor Patch

Detection Type:
Linux Distribution Package

Affected Versions:
libxml2 on Debian Linux

Recommendations:
For Debian 7 'Wheezy', these problems have been fixed in version 2.8.0+dfsg1-7+wheezy8. We recommend that you upgrade your libxml2 Linux Distribution Packages.

Summary:
CVE-2017-7375 Missing validation for external entities in xmlParsePEReference CVE-2017-9047 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 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.

Detection Method:
This check tests the installed software version using the apt Linux Distribution Package manager.

NIST (National Institute of Standards and Technology) NVD (National Vulnerability Database)

https://nvd.nist.gov/vuln/detail/CVE-2017-7375
https://nvd.nist.gov/vuln/detail/CVE-2017-9047
https://nvd.nist.gov/vuln/detail/CVE-2017-9048
https://nvd.nist.gov/vuln/detail/CVE-2017-9049
https://nvd.nist.gov/vuln/detail/CVE-2017-9050

References:

https://lists.debian.org/debian-lts-announce/2017/06/msg00037.html

Severity
High
CVSS Score
7.5
Published
2018-01-28
Modified
2019-03-18
Category
Debian Local Security Checks

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