NULL pointer dereference in Libextractor - CVE-2018-20431

Vulnerability identifier: #VU16688

CSH Severity: Low

CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2018-20431

CWE-ID: CWE-476

Exploitation vector: Remote access

Exploit availability: No public exploit available

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

The vulnerability exists due to a NULL pointer dreference error in the function process_metadata() in plugins/ole2_extractor.c. A remote attacker can perform a denial of service (DoS) attack.

Libextractor
libextractor (Debian package)
extract (Ubuntu package)
libextractor-dev (Ubuntu package)
libextractor3 (Ubuntu package)
Ubuntu

Install update from vendor's website.

libextractor (Debian package) - update to 1:1.3-4+deb9u3
extract (Ubuntu package) - update to 1:1.3-4+deb9u3build0.16.04.1
libextractor-dev (Ubuntu package) - update to 1:1.3-4+deb9u3build0.16.04.1
libextractor3 (Ubuntu package) - update to 1:1.3-4+deb9u3build0.16.04.1

• https://gnunet.org/bugs/view.php?id=5494
• https://gnunet.org/git/libextractor.git/commit/?id=489c4a540bb2c4744471441425b8932b97a153e7
• https://gnunet.org/git/libextractor.git/tree/ChangeLog

• Denial of service in GNU Libextractor
• Debian update for libextractor
• Ubuntu update for libextractor