dpkg-deb: Fix cleanup for control member with restricted directories

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Summary

CVECVE-2025-6297
StatePUBLISHED
Assignerdebian
Source PriorityCVE Program / NVD first with legacy fallback
Published2025-07-01 17:15:30 UTC
Updated2026-07-08 09:16:28 UTC
DescriptionIt was discovered that dpkg-deb does not properly sanitize directory permissions when extracting a control member into a temporary directory, which is documented as being a safe operation even on untrusted data. This may result in leaving temporary files behind on cleanup. Given automated and repeated execution of dpkg-deb commands on adversarial .deb packages or with well compressible files, placed inside a directory with permissions not allowing removal by a non-root user, this can end up in a DoS scenario due to causing disk quota exhaustion or disk full conditions.

Risk And Classification

Primary CVSS: v3.1 8.2 HIGH from ADP

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N

Problem Types: CWE-400 | CWE-732 | CWE-732 CWE-732 Incorrect Permission Assignment for Critical Resource | CWE-400 CWE-400 Uncontrolled Resource Consumption

VersionSourceTypeScoreSeverityVector
3.1ADPDECLARED8.2HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
3.1134c704f-9b21-4f2e-91b3-4a467353bcc0Secondary8.2HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
Low
Availability
None

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Debian Dpkg All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Debian Dpkg affected ed6bbd445dd8800308c67236ba35d08004c98e82 custom Not specified

References

ReferenceSourceLinkTags
lists.debian.org/debian-lts-announce/2026/07/msg00015.html af854a3a-2127-422b-91ae-364da2661108 lists.debian.org
git.dpkg.org/cgit/dpkg/dpkg.git/commit [email protected] git.dpkg.org Patch
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