CVE-2018-18584

high-risk
Published 2018-10-23

In mspack/cab.h in libmspack before 0.8alpha and cabextract before 1.8, the CAB block input buffer is one byte too small for the maximal Quantum block, leading to an out-of-bounds write.

Do I need to act?

~
6.4% chance of exploitation in next 30 days
EPSS score — moderate exploit probability
-
Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
6
CVSS 6.5/10 Medium
NETWORK / LOW complexity

Affected Products (19)

Cabextract
Libmspack
Libmspack
Libmspack
Libmspack
Libmspack
Libmspack

Affected Vendors

Debian Redhat Suse Canonical Cabextract Project Libmspack Project Starwindsoftware

References (22)

Third Party Advisory https://access.redhat.com/errata/RHSA-2019:2049
Mailing List https://bugs.debian.org/911640
Patch https://github.com/kyz/libmspack/commit/40ef1b4093d77ad3a5cfcee1f5cb6108b3a3bcc2
Mailing List https://lists.debian.org/debian-lts-announce/2018/10/msg00017.html
Third Party Advisory https://security.gentoo.org/glsa/201903-20
Third Party Advisory https://usn.ubuntu.com/3814-1/
Third Party Advisory https://usn.ubuntu.com/3814-2/
Third Party Advisory https://usn.ubuntu.com/3814-3/
Product https://www.cabextract.org.uk/#changes
Mailing List https://www.openwall.com/lists/oss-security/2018/10/22/1
Third Party Advisory https://www.starwindsoftware.com/security/sw-20181213-0001/
Third Party Advisory https://access.redhat.com/errata/RHSA-2019:2049
Mailing List https://bugs.debian.org/911640
Patch https://github.com/kyz/libmspack/commit/40ef1b4093d77ad3a5cfcee1f5cb6108b3a3bcc2
Mailing List https://lists.debian.org/debian-lts-announce/2018/10/msg00017.html
Third Party Advisory https://security.gentoo.org/glsa/201903-20
Third Party Advisory https://usn.ubuntu.com/3814-1/
Third Party Advisory https://usn.ubuntu.com/3814-2/
Third Party Advisory https://usn.ubuntu.com/3814-3/
Product https://www.cabextract.org.uk/#changes
and 2 more references
52
/ 100
high-risk
Severity 24/34 · High
Exploitability 9/34 · Low
Exposure 19/34 · Moderate