CVE-2017-12425
Published: 4 August 2017
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.
Priority
Status
| Package | Release | Status |
|---|---|---|
|
varnish Launchpad, Ubuntu, Debian |
trusty |
Not vulnerable
(code not exposed to clients)
|
| upstream |
Released
(5.0.0-7.1)
|
|
| xenial |
Released
(4.1.1-1ubuntu0.2)
|
|
| zesty |
Released
(5.0.0-7ubuntu0.1)
|
|
|
Patches: upstream: https://github.com/varnishcache/varnish-cache/commit/09731b24b2225e3c0d66d3ec1b4fedef6fa22b6e upstream: https://github.com/varnishcache/varnish-cache/commit/54b5a09f00c027da280361b30d32a4ff309ba3ab |
||
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score | 7.5 |
| Attack vector | Network |
| Attack complexity | Low |
| Privileges required | None |
| User interaction | None |
| Scope | Unchanged |
| Confidentiality | None |
| Integrity impact | None |
| Availability impact | High |
| Vector | CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |