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Debian LTS Advisory ([SECURITY] [DLA 1846-1] unzip security update)
Information
Severity
Severity
Family
Family
CVSSv2 Base
CVSSv2 Base
CVSSv2 Vector
CVSSv2 Vector
Solution Type
Solution Type
Created
Created
Modified
Modified
Summary
The remote host is missing an update for the 'unzip' package(s) announced via the DSA-1846-1 advisory.
Insight
Insight
David Fifield discovered a way to construct non-recursive 'zip bombs' that achieve a high compression ratio by overlapping files inside the zip container. However the output size increases quadratically in the input size, reaching a compression ratio of over 28 million (10 MB -> 281 TB) at the limits of the zip format which can cause a denial-of-service. Mark Adler provided a patch to detect and reject such zip files for the unzip program.
Affected Software
Affected Software
'unzip' package(s) on Debian Linux.
Detection Method
Detection Method
Checks if a vulnerable package version is present on the target host.
Solution
Solution
For Debian 8 'Jessie', this problem has been fixed in version 6.0-16+deb8u4. We recommend that you upgrade your unzip packages.