CVE-2017-9047

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.
Configurations

Configuration 1 (hide)

cpe:2.3:a:xmlsoft:libxml2:2.9.4:*:*:*:*:*:*:*

History

29 Jun 2021, 15:15

Type Values Removed Values Added
References
  • (MLIST) https://lists.apache.org/thread.html/rf4c02775860db415b4955778a131c2795223f61cb8c6a450893651e4@%3Cissues.bookkeeper.apache.org%3E -

Information

Published : 2017-05-18 06:29

Updated : 2024-02-04 19:11


NVD link : CVE-2017-9047

Mitre link : CVE-2017-9047

CVE.ORG link : CVE-2017-9047


JSON object : View

Products Affected

xmlsoft

  • libxml2
CWE
CWE-119

Improper Restriction of Operations within the Bounds of a Memory Buffer