CVE-2017-16931

Description

parser.c in libxml2 before 2.9.5 mishandles parameter-entity references because the NEXTL macro calls the xmlParserHandlePEReference function in the case of a '%' character in a DTD name.

CVSS Metrics

• v3.0•CRITICAL•Score: 9.8CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
• v2.0•HIGH•Score: 7.5AV:N/AC:L/Au:N/C:P/I:P/A:P

EPSS Trends

Current EPSS score: 1.44%• Percentile: 81%

Techniques & Countermeasures

• CWE-119•Improper Restriction of Operations within the Bounds of a Memory Buffer

  The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.

Affected Systems

• xmlsoft•libxml2

  ≤ 2.9.4

References (5)

• https://lists.debian.org/debian-lts-announce/2017/11/msg00041.html
• https://www.oracle.com//security-alerts/cpujul2021.html
• https://bugzilla.gnome.org/show_bug.cgi?id=766956
• http://xmlsoft.org/news.html
• https://github.com/GNOME/libxml2/commit/e26630548e7d138d2c560844c43820b6767251e3