Out-of-bounds read in expat - CVE-2009-3720

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Main Vulnerability Database Vulnerabilities #VU31845

Out-of-bounds read in expat - CVE-2009-3720

Published: November 3, 2009 / Updated: July 24, 2020


Vulnerability identifier: #VU31845
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2009-3720
CWE-ID: CWE-125
Exploitation vector: Remote access
Exploit availability: No public exploit available
Vendor: libexpat.org
Affected software:
expat

Detailed vulnerability description

The vulnerability allows a remote attacker to perform denial of service (DoS) attack.

The vulnerability exists due to a boundary condition when processing an XML document with crafted UTF-8 sequences that trigger a buffer over-read, a different vulnerability than CVE-2009-2625 within the The updatePosition function in lib/xmltok_impl.c in libexpat in Expat 2.0.1, as used. A remote attacker can create a specially crafted file, pass it to the application, trigger out-of-bounds read error and crash the affected application.


How to mitigate CVE-2009-3720

Cybersecurity Help is currently unaware of any official solution to address this vulnerability.

Sources