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.
History

No history.

cve-icon MITRE

Status: PUBLISHED

Assigner: mitre

Published: 2017-05-18T06:13:00

Updated: 2024-08-05T16:55:21.859Z

Reserved: 2017-05-18T00:00:00

Link: CVE-2017-9047

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Modified

Published: 2017-05-18T06:29:00.403

Modified: 2023-11-07T02:50:35.677

Link: CVE-2017-9047

cve-icon Redhat

Severity : Moderate

Publid Date: 2017-05-15T00:00:00Z

Links: CVE-2017-9047 - Bugzilla