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CVE-2018-20431

GNU Libextractor through 1.8 has a NULL Pointer Dereference vulnerability in the function...

6.5 MediumFix available

GNU Libextractor through 1.8 has a NULL Pointer Dereference vulnerability in the function process_metadata() in plugins/ole2_extractor.c.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
None
User interaction
Required

What an attacker can affect

Confidentiality
None
Integrity
None
Availability
High

Exploit likelihood

2.23%Up 0.8 points since Apr 14, 2021
90%50%10%1%

What each source reports

NVD Score used 6.5

GNU Libextractor through 1.8 has a NULL Pointer Dereference vulnerability in the function process_metadata() in plugins/ole2_extractor.c.

Record
CVE-2018-20431
CVSS 3.0
6.5 MediumCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
CVSS 2.0
4.3 MediumAV:N/AC:M/Au:N/C:N/I:N/A:P
Weakness
CWE-476
Updated
2026-11-02
CVE List No score

GNU Libextractor through 1.8 has a NULL Pointer Dereference vulnerability in the function process_metadata() in plugins/ole2_extractor.c.

Record
CVE-2018-20431
Updated
2026-11-02
EUVDEUVD-2018-12988 No score

GNU Libextractor through 1.8 has a NULL Pointer Dereference vulnerability in the function process_metadata() in plugins/ole2_extractor.c.

Record
EUVD-2018-12988
Updated
2026-11-03
GitHub AdvisoriesGHSA-j85j-8r4r-vm4q 6.5

GNU Libextractor through 1.8 has a NULL Pointer Dereference vulnerability in the function...

GNU Libextractor through 1.8 has a NULL Pointer Dereference vulnerability in the function process_metadata() in plugins/ole2_extractor.c.

Record
GHSA-j85j-8r4r-vm4q
CVSS 3.0
6.5 MediumCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Weakness
CWE-476
Updated
2026-11-02
OSV 6.5

GNU Libextractor through 1.8 has a NULL Pointer Dereference vulnerability in the function process_metadata() in plugins/ole2_extractor.c.

Record
CVE-2018-20431
CVSS 3.0
6.5 MediumCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVDEBIAN-CVE-2018-20431 6.5

GNU Libextractor through 1.8 has a NULL Pointer Dereference vulnerability in the function process_metadata() in plugins/ole2_extractor.c.

Record
DEBIAN-CVE-2018-20431
CVSS 3.0
6.5 MediumCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVUBUNTU-CVE-2018-20431 6.5

GNU Libextractor through 1.8 has a NULL Pointer Dereference vulnerability in the function process_metadata() in plugins/ole2_extractor.c.

Record
UBUNTU-CVE-2018-20431
CVSS 3.0
6.5 MediumCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVMGASA-2019-0013 No score

Updated libextractor packages fix security vulnerabilities

Several vulnerabilities were discovered in libextractor which may lead to denial of service or memory disclosure if a malformed OLE file is processed (CVE-2018-20430, CVE-2018-20431).

Record
MGASA-2019-0013
Updated
2026-11-02
OSVUSN-4641-1 No score

libextractor vulnerabilities

It was discovered that Libextractor incorrectly handled zero sample rate. An attacker could possibly use this issue to cause a denial of service. (CVE-2017-15266)

It was discovered that Libextractor incorrectly handled certain FLAC metadata. An attacker could possibly use this issue to cause a denial of service. (CVE-2017-15267)

It was discovered that Libextractor incorrectly handled certain specially crafted files. An attacker could possibly use this issue to cause a denial of service. (CVE-2017-15600, CVE-2018-16430, CVE-2018-20430)

It was discovered that Libextractor incorrectly handled certain inputs. An attacker could possibly use this issue to cause a denial of service. (CVE-2017-15601)

It was discovered that Libextractor incorrectly handled integers. An attacker could possibly use this issue to cause a denial of service. (CVE-2017-15602)

It was discovered that Libextractore incorrectly handled certain crafted files. An attacker could possibly use this issue to cause a denial of service. (CVE-2017-15922)

It was discovered tha Libextractor incorrectly handled certain files. An attacker could possibly use this issue to cause a denial of service. (CVE-2017-17440)

It was discovered that Libextractor incorrectly handled certain malformed files. An attacker could possibly use this issue to cause a denial of service. (CVE-2018-14346)

It was discovered that Libextractor incorrectly handled malformed files. An attacker could possibly use this issue to cause a denial of service. (CVE-2018-14347)

It was discovered that Libextractor incorrectly handled metadata. An attacker could possibly use this issue to cause a denial of service. (CVE-2018-20431)

Record
USN-4641-1
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
libextractor
Debian:12
 before 1:1.8-2
1:1.8-2
libextractor
Debian:13
 before 1:1.8-2
1:1.8-2
libextractor
Debian:14
 before 1:1.8-2
1:1.8-2
libextractor
Debian:8
From an advisory covering 2 CVEs
 before 1:1.3-2+deb8u4, plus listed versions
1:1.3-21:1.3-2+deb8u11:1.3-2+deb8u21:1.3-2+deb8u3
1:1.3-2+deb8u4
libextractor
Debian:9
From an advisory covering 2 CVEs
 before 1:1.3-4+deb9u3, plus listed versions
1:1.3-41:1.3-4+deb9u11:1.3-4+deb9u2
1:1.3-4+deb9u3
libextractor
Mageia:6
From an advisory covering 2 CVEs
 before 1.7-1.1.mga6
1.7-1.1.mga6
libextractor
Ubuntu:Pro:14.04:LTS
 before 1:1.3-1ubuntu0.1~esm1, plus listed versions
1:1.1-1ubuntu11:1.2-1ubuntu11:1.3-1
1:1.3-1ubuntu0.1~esm1
libextractor
Ubuntu:16.04:LTS
 before 1:1.3-4+deb9u3build0.16.04.1, plus listed versions
1:1.3-2build11:1.3-2ubuntu11:1.3-3
1:1.3-4+deb9u3build0.16.04.1
libextractor
Ubuntu:18.04:LTS
 All versions, plus listed versions
1:1.3-4build31:1.6-11:1.6-1build11:1.6-2
 None known
libextractor
Ubuntu:16.04:LTS
From an advisory covering 12 CVEs
 before 1:1.3-4+deb9u3build0.16.04.1, plus listed versions
1:1.3-2build11:1.3-2ubuntu11:1.3-3
1:1.3-4+deb9u3build0.16.04.1

History

History
RecordedChangedSources
affected, facts
aliasesEUVD
first indexedCVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2018-20431 is a medium vulnerability (CVSS 6.5) in Gnu Libextractor, published December 24, 2018. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 2.23%, the 82nd percentile. Fixed in libextractor 1:1.8-2.

References

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