Bug 1477222 (CVE-2017-12425) - CVE-2017-12425 varnish: Missing check for integer overflow when handling chunk sizes in HTTP requests
Summary: CVE-2017-12425 varnish: Missing check for integer overflow when handling chun...
Status: CLOSED WONTFIX
Alias: CVE-2017-12425
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard: impact=moderate,public=20170802,repor...
Keywords: Security
Depends On: 1476784 1477698 1477699
Blocks: 1477246
TreeView+ depends on / blocked
 
Reported: 2017-08-01 13:50 UTC by Adam Mariš
Modified: 2019-06-08 22:12 UTC (History)
7 users (show)

(edit)
An integer overflow flaw, leading to assertion failure, was found in the way Varnish handled chunk sizes in HTTP requests. A remote attacker could use this flaw to make the Varnish daemon restart unexpectedly due to an assertion failure by sending a specially crafted HTTP request.
Clone Of:
(edit)
Last Closed: 2017-08-08 05:20:14 UTC


Attachments (Terms of Use)
varnish 4.0 patch (3.05 KB, patch)
2017-08-01 14:41 UTC, Adam Mariš
no flags Details | Diff
varnish 4.1 patch (2.79 KB, patch)
2017-08-01 14:42 UTC, Adam Mariš
no flags Details | Diff
varnish 5.0 patch (3.09 KB, patch)
2017-08-01 14:42 UTC, Adam Mariš
no flags Details | Diff
varnish 5.1 patch (2.20 KB, patch)
2017-08-01 14:43 UTC, Adam Mariš
no flags Details | Diff

Description Adam Mariš 2017-08-01 13:50:47 UTC
Missing check for integer overflow was found in the code handling chunk sizes in HTTP requests. The vulnerability opens up for denial of service (DOS) attacks by a specially crafted HTTP request, which will cause the Varnish daemon to assert and restart, clearing the cache in the process. There is no risk for information leakage or remote execution. The vulnerability is present in all releases of Varnish Cache since version 4.0.1.

Comment 1 Adam Mariš 2017-08-01 13:50:51 UTC
Acknowledgments:

Name: the Varnish Cache project

Comment 2 Adam Mariš 2017-08-01 14:41 UTC
Created attachment 1307655 [details]
varnish 4.0 patch

Comment 3 Adam Mariš 2017-08-01 14:42 UTC
Created attachment 1307656 [details]
varnish 4.1 patch

Comment 4 Adam Mariš 2017-08-01 14:42 UTC
Created attachment 1307657 [details]
varnish 5.0 patch

Comment 5 Adam Mariš 2017-08-01 14:43 UTC
Created attachment 1307658 [details]
varnish 5.1 patch

Comment 9 Adam Mariš 2017-08-02 16:12:01 UTC
External References:

https://www.varnish-cache.org/security/VSV00001.html

Comment 10 Adam Mariš 2017-08-02 16:12:27 UTC
Created varnish tracking bugs for this issue:

Affects: epel-all [bug 1477699]
Affects: fedora-all [bug 1477698]


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