CVE-2017-9047

Description

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.

Risk Information

Base Score

7.5

MODERATE

Vector

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS Score

Exploitation Probability

3.02

Associated Vulnerability

Vulnerability	OS Platform
Multiple Vulnerabilities are affected in IBM Security Guardium 10.0	Windows
Multiple Vulnerabilities are affected in IBM Aspera Shares 1.10.1	Windows
Multiple Vulnerabilities are affected in IBM Cognos Analytics 11.0.9.0	Windows
libxml2 security update(DSA-3952-1) libxml2_2.9.1+dfsg1-5+deb8u5_i386.deb	Linux
libxml2 security update(DSA-3952-1) libxml2_2.9.4+dfsg1-2.2+deb9u1_i386.deb	Linux
Improper Restriction of Operations within the Bounds of a Memory Buffer Vulnerability (CVE-2017-9047)	NCM

Patch Details

No records found

References

https://nvd.nist.gov/vuln/detail/CVE-2023-1234
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-1234