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Huawei EulerOS: Security Advisory for libxml2 (EulerOS-SA-2017-1238)
Information
Severity
Severity
Family
Family
CVSSv2 Base
CVSSv2 Base
CVSSv2 Vector
CVSSv2 Vector
Solution Type
Solution Type
Created
Created
Modified
Modified
Summary
The remote host is missing an update for the Huawei EulerOS 'libxml2' package(s) announced via the EulerOS-SA-2017-1238 advisory.
Insight
Insight
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 Software
Affected Software
'libxml2' package(s) on Huawei EulerOS V2.0SP2.
Detection Method
Detection Method
Checks if a vulnerable package version is present on the target host.
Solution
Solution
Please install the updated package(s).