Huawei EulerOS: Security Advisory for libxml2 (EulerOS-SA-2017-1238)

Published: 2020-01-23 11:00:23
CVE Author: NIST National Vulnerability Database

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

Summary:
The remote host is missing an update for the Huawei EulerOS 'libxml2' Linux Distribution Package(s) announced via the EulerOS-SA-2017-1238 advisory.

Detection Method:
Checks if a vulnerable Linux Distribution Package version is present on the target host.

Technical Details:
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-2017-9047)

Affected Versions:
'libxml2' Linux Distribution Package(s) on Huawei EulerOS V2.0SP2.

Recommendations:
Please install the updated Linux Distribution Package(s).

Solution Type:
Vendor Patch

Detection Type:
Linux Distribution Package

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

https://nvd.nist.gov/vuln/detail/CVE-2017-9047

References:

https://developer.huaweicloud.com/ict/en/site-euleros/euleros/security-advisories/EulerOS-SA-2017-1238

Severity
Medium
CVSS Score
5.0
Published
2020-01-23
Modified
2020-01-23
Category
Huawei EulerOS Local Security Checks

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