Integer Overflow or Wraparound Affecting varnish package, versions <5.0.0-7.1
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-DEBIAN11-VARNISH-522667
- published4 Aug 2017
- disclosed4 Aug 2017
Introduced: 4 Aug 2017
CVE-2017-12425 (opens in a new tab)How to fix?
Upgrade Debian:11 varnish to version 5.0.0-7.1 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream varnish package and not the varnish package as distributed by Debian.
See How to fix? for Debian:11 relevant fixed versions and status.
An issue was discovered in Varnish HTTP Cache 4.0.1 through 4.0.4, 4.1.0 through 4.1.7, 5.0.0, and 5.1.0 through 5.1.2. A wrong if statement in the varnishd source code means that particular invalid requests from the client can trigger an assert, related to an Integer Overflow. This causes the varnishd worker process to abort and restart, losing the cached contents in the process. An attacker can therefore crash the varnishd worker process on demand and effectively keep it from serving content - a Denial-of-Service attack. The specific source-code filename containing the incorrect statement varies across releases.
References
- https://security-tracker.debian.org/tracker/CVE-2017-12425
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-12425
- http://www.debian.org/security/2017/dsa-3924
- https://github.com/varnishcache/varnish-cache/issues/2379
- https://bugzilla.suse.com/show_bug.cgi?id=1051917
- https://lists.debian.org/debian-security-announce/2017/msg00186.html
- https://www.varnish-cache.org/security/VSV00001.html#vsv00001
- https://bugzilla.redhat.com/show_bug.cgi?id=1477222
- http://people.ubuntu.com/~ubuntu-security/cve/CVE-2017-12425