CVE Tools

Description

The CInArchive::ReadFileItem method in Archive/Udf/UdfIn.cpp in 7zip 9.20 and 15.05 beta and p7zip allows remote attackers to cause a denial of service (out-of-bounds read) or execute arbitrary code via the PartitionRef field in the Long Allocation Descriptor in a UDF file.

In plain language

AI Worth attention

A bug in 7-zip and p7zip can be triggered by a specially crafted UDF file to crash the program or potentially run unauthorized code when someone opens it—most small businesses only need to worry if employees download or receive files that get unpacked.

Executive summary

CVE-2016-2335 is a parsing flaw in 7-zip/p7zip’s UDF handling (CInArchive::ReadFileItem / Archive/Udf/UdfIn.cpp) where a malicious UDF’s PartitionRef/Long Allocation Descriptor fields can lead to out-of-bounds reads, enabling denial of service or arbitrary code execution when a user opens the file.

If affected, business impact
Application crash during file unpackingUnauthorized code execution riskSystem compromise via malicious fileDisruption to customer operations

What to do now

  1. Identify where 7-zip or p7zip is used to open/unpack UDF files (email attachments, downloads, customer-provided files).
  2. Check your installed versions of 7-zip/p7zip; confirm whether you have releases in the affected range (including 7-zip 9.20 and p7zip variants matching older builds).
  3. Upgrade 7-zip/p7zip to a fixed release: for p7zip, update to 16.02-r1 or later (and for openSUSE follow the distribution guidance linked in the vendor remediation notes).
  4. Reduce exposure while upgrading by restricting who can open unknown/untrusted files and scanning received archives with your existing security tools before extraction.
Some work to apply

CVSS Vector Breakdown

AV:NAC:LPR:NUI:RS:UC:HI:HA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:RUser Interaction
Required
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High

Weaknesses

Affected Products

and 1 more affected products View all →

Exploitability

Official Patch Available

Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

2 techniques
Initial Access
Privilege Escalation
View detailed technique mapping

References

and 14 more references View all →

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