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CVE-2012-6706: A VMSF_DELTA memory corruption was discovered in unrar before 5.5.5, as used in Sophos Anti-Virus Threat De...

A VMSF_DELTA memory corruption was discovered in unrar before 5.5.5, as used in Sophos Anti-Virus Threat Detection Engine before 3.37.2 and other products, that can lead to arbitrary code execution. An integer overflow can be caused in DataSize+CurChannel. The result is a negative value of the "DestPos" variable, which allows the attacker to write out of bounds when setting Mem[DestPos].

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

A crafted RAR archive can corrupt memory in vulnerable UnRAR code. Products that automatically inspect archives, including affected antivirus engines, may process the file before a user opens it, creating a high-impact remote code execution risk where vulnerable versions remain deployed.

Executive priority

Treat as high priority for environments where email, endpoint, gateway, or file-scanning systems process untrusted archives. Prioritize internet-facing and automated scanning paths first because successful exploitation could run attacker-controlled code inside trusted security tooling.

Technical view

The flaw is a VMSF_DELTA memory corruption in unrar before 5.5.5. An integer overflow in DataSize+CurChannel can make DestPos negative, allowing an out-of-bounds write to Mem[DestPos]. The CVE description states this can lead to arbitrary code execution.

Likely exposure

Exposure is likely where unrar before 5.5.5, Sophos Anti-Virus Threat Detection Engine before 3.37.2, or other products embedding vulnerable UnRAR code process untrusted RAR archives. The bundle does not enumerate all affected downstream products.

Exploitation context

The source bundle does not show CISA KEV listing or active exploitation evidence. The practical risk is archive parsing in automated security or mail workflows, where malicious RAR files may be inspected without direct user action.

Researcher notes

The core primitive is an integer overflow leading to a negative destination index and out-of-bounds write during VMSF_DELTA handling. Evidence supports arbitrary code execution potential, but exploit prevalence and complete downstream product impact are not established in the provided bundle.

Mitigation direction

  • Upgrade unrar to version 5.5.5 or later where applicable.
  • Upgrade Sophos Anti-Virus Threat Detection Engine to 3.37.2 or later.
  • Inventory products that embed UnRAR archive parsing code.
  • Check each vendor advisory for product-specific fixed versions.
  • Limit automated processing of untrusted RAR archives until remediated.

Validation and detection

  • Identify installed unrar versions across servers, endpoints, and build images.
  • Confirm Sophos engine versions on managed endpoints and gateways.
  • Review security products for embedded UnRAR or RAR parsing components.
  • Check package manager advisories, including Gentoo GLSA references, for remediation status.
  • Verify vulnerability scanners flag only versions covered by cited advisories.
Prepared
Confidence
medium
Sources
10

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

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Execution behavior lookup

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CVE-2012-6706 mapping review

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors
0Timeline events
0ADP providers
9Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
n/an/an/aListed
Weakness

CWE details

No CWE listed

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