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Bug 1595985 - (CVE-2018-14404) CVE-2018-14404 libxml2: NULL pointer dereference in xpath.c:xmlXPathCompOpEval() can allow attackers to cause a denial of service
CVE-2018-14404 libxml2: NULL pointer dereference in xpath.c:xmlXPathCompOpEva...
Status: NEW
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
unspecified
All Linux
medium Severity medium
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Assigned To: Red Hat Product Security
impact=moderate,public=20180618,repor...
: Security
Depends On: 1595987 1595988 1595989 1602817 1609130 1595986
Blocks: 1595990
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Reported: 2018-06-27 21:10 EDT by Sam Fowler
Modified: 2018-10-12 06:41 EDT (History)
28 users (show)

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Doc Text:
A null pointer dereference vulnerability exists in the xpath.c:xmlXPathCompOpEval() function of libxml2 when parsing invalid XPath expression. Applications processing untrusted XSL format inputs with the use of libxml2 library may be vulnerable to denial of service attack due to crash of the application.
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Description Sam Fowler 2018-06-27 21:10:50 EDT 
libxml2 is vulnerable to a NULL pointer dereference in the xpath.c:xmlXPathCompOpEval() function due to missing checks for NULL in XPATH_OP_AND and XPATH_OP_OR switch cases. An attacker could exploit this via crafted xpath expressions to cause a denial of service.


Reference:

https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=901817
Comment 1 Sam Fowler 2018-06-27 21:11:46 EDT 
Created libxml2 tracking bugs for this issue:

Affects: fedora-all [bug 1595986]


Created mingw-libxml2 tracking bugs for this issue:

Affects: epel-7 [bug 1595988]
Affects: fedora-all [bug 1595987]
Comment 6 Adam Mariš 2018-07-18 09:47:41 EDT 
Statement:

This issue affects the versions of libxml2 as shipped with Red Hat Enterprise Linux 5. Red Hat Enterprise Linux 5 is now in Extended Life Phase of the support and maintenance life cycle. This issue is not currently planned to be addressed in future updates. For additional information, refer to the Red Hat Enterprise Linux Life Cycle: https://access.redhat.com/support/policy/updates/errata/.

This issue affects the versions of libxml2 as shipped with Red Hat Enterprise Linux 6. Red Hat Enterprise Linux 6 is now in Maintenance Support 2 Phase of the support and maintenance life cycle. This has been rated as having a security impact of Moderate, and is not currently planned to be addressed in future updates. For additional information, refer to the Red Hat Enterprise Linux Life Cycle: https://access.redhat.com/support/policy/updates/errata/.

This issue affects the versions of libxml2 as shipped with Red Hat Enterprise Linux 7. Red Hat Product Security has rated this issue as having a security impact of Moderate. A future update may address this issue. For additional information, refer to the Issue Severity Classification: https://access.redhat.com/security/updates/classification/.
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