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Bug 1463205 - (CVE-2017-7668) CVE-2017-7668 httpd: ap_find_token() buffer overread
CVE-2017-7668 httpd: ap_find_token() buffer overread
Status: NEW
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
unspecified
All Linux
medium Severity medium
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Assigned To: Red Hat Product Security
impact=moderate,public=20170620,repor...
: Security
Depends On: 1463208 1464876 1464877 1465916 1466263 1466264 1473691 1473692 1473693 1510060 1510061
Blocks: 1463212 1464082
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Reported: 2017-06-20 07:29 EDT by Andrej Nemec
Modified: 2018-10-19 17:41 EDT (History)
45 users (show)

See Also:
Fixed In Version: httpd 2.2.34, httpd 2.4.26
Doc Type: If docs needed, set a value
Doc Text:
A buffer over-read flaw was found in the httpd's ap_find_token() function. A remote attacker could use this flaw to cause httpd child process to crash via a specially crafted HTTP request.
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RHEL 7.3 requirements from Atomic Host:
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External Trackers
Tracker ID Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2017:2479 normal SHIPPED_LIVE Important: httpd security update 2017-08-15 18:23:44 EDT
Red Hat Product Errata RHSA-2017:2483 normal SHIPPED_LIVE Important: httpd24-httpd security update 2017-08-16 23:04:17 EDT
Red Hat Product Errata RHSA-2017:3193 normal SHIPPED_LIVE Important: httpd security update 2017-11-13 17:35:40 EST
Red Hat Product Errata RHSA-2017:3194 normal SHIPPED_LIVE Important: httpd security update 2017-11-13 17:36:28 EST

  None (edit)
Description Andrej Nemec 2017-06-20 07:29:23 EDT 
The HTTP strict parsing changes added in 2.2.32 and 2.4.24 introduced a bug in token list parsing, which allows ap_find_token() to search past the end of its input string. By maliciously crafting a sequence of request headers, an attacker may be able to cause a segmentation fault, or to force ap_find_token() to return an incorrect value.

External References:

https://httpd.apache.org/security/vulnerabilities_24.html
https://httpd.apache.org/security/vulnerabilities_22.html
Comment 1 Andrej Nemec 2017-06-20 07:38:04 EDT 
Created httpd tracking bugs for this issue:

Affects: fedora-all [bug 1463208]
Comment 6 Tomas Hoger 2017-06-26 16:45:00 EDT 
(In reply to Andrej Nemec from comment #0)
> The HTTP strict parsing changes added in 2.2.32 and 2.4.24 introduced a bug
> in token list parsing, which allows ap_find_token() to search past the end
> of its input string.

The strict HTTP parsing was a fix for flaw with CVE id CVE-2016-8743 and is tracked via bug 1406822.  The change was already backported to multiple Red Hat products, even if they contain older httpd version.
Comment 15 errata-xmlrpc 2017-08-15 14:26:21 EDT 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2017:2479 https://access.redhat.com/errata/RHSA-2017:2479
Comment 16 errata-xmlrpc 2017-08-16 19:07:09 EDT 
This issue has been addressed in the following products:

  Red Hat Software Collections for Red Hat Enterprise Linux 7
  Red Hat Software Collections for Red Hat Enterprise Linux 6
  Red Hat Software Collections for Red Hat Enterprise Linux 6.7 EUS
  Red Hat Software Collections for Red Hat Enterprise Linux 7.3 EUS

Via RHSA-2017:2483 https://access.redhat.com/errata/RHSA-2017:2483
Comment 18 errata-xmlrpc 2017-11-13 12:37:11 EST 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7.2 Extended Update Support

Via RHSA-2017:3193 https://access.redhat.com/errata/RHSA-2017:3193
Comment 19 errata-xmlrpc 2017-11-13 12:41:06 EST 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7.3 Extended Update Support

Via RHSA-2017:3194 https://access.redhat.com/errata/RHSA-2017:3194
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