Bug 1388379 (CVE-2016-8619) - CVE-2016-8619 curl: Double-free in krb5 code
Summary: CVE-2016-8619 curl: Double-free in krb5 code
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2016-8619
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:
Depends On: 1390894 1390895 1390896
Blocks: 1388393
TreeView+ depends on / blocked
 
Reported: 2016-10-25 08:22 UTC by Andrej Nemec
Modified: 2021-02-17 03:08 UTC (History)
35 users (show)

Fixed In Version: curl 7.51.0
Doc Type: If docs needed, set a value
Doc Text:
Clone Of:
Environment:
Last Closed: 2019-06-08 03:00:59 UTC
Embargoed:

Attachments (Terms of Use)
Upstream patch (1.26 KB, patch)
2016-10-25 08:57 UTC, Andrej Nemec 		no flags Details | Diff
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Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2018:2486 0 None None None 2018-08-16 16:07:32 UTC
Red Hat Product Errata RHSA-2018:3558 0 None None None 2018-11-13 08:33:31 UTC

Description Andrej Nemec 2016-10-25 08:22:22 UTC 
In curl's implementation of the Kerberos authentication mechanism, the
function `read_data()` in security.c is used to fill the necessary krb5
structures. When reading one of the length fields from the socket, it fails to
ensure that the length parameter passed to realloc() is not set to 0.

This would lead to realloc() getting called with a zero size and when doing so
realloc() returns NULL *and* frees the memory - in contrary to normal
realloc() fails where it only returns NULL - causing libcurl to free the
memory *again* in the error path.

This flaw could be triggered by a malicious or just otherwise ill-behaving
server.

External References:

https://curl.haxx.se/docs/adv_20161102E.html
Comment 1 Andrej Nemec 2016-10-25 08:57:06 UTC 
Created attachment 1213775 [details]
Upstream patch
Comment 3 Adam Mariš 2016-11-02 08:27:25 UTC 
Created curl tracking bugs for this issue:

Affects: fedora-all [bug 1390894]
Comment 4 Adam Mariš 2016-11-02 08:27:40 UTC 
Created mingw-curl tracking bugs for this issue:

Affects: fedora-all [bug 1390895]
Affects: epel-7 [bug 1390896]
Comment 7 errata-xmlrpc 2018-08-16 16:07:20 UTC 
This issue has been addressed in the following products:

  Red Hat JBoss Core Services

Via RHSA-2018:2486 https://access.redhat.com/errata/RHSA-2018:2486
Comment 8 errata-xmlrpc 2018-11-13 08:33:18 UTC 
This issue has been addressed in the following products:

  Red Hat Software Collections for Red Hat Enterprise Linux 6
  Red Hat Software Collections for Red Hat Enterprise Linux 7
  Red Hat Software Collections for Red Hat Enterprise Linux 7.4 EUS
  Red Hat Software Collections for Red Hat Enterprise Linux 7.5 EUS
  Red Hat Software Collections for Red Hat Enterprise Linux 7.6 EUS

Via RHSA-2018:3558 https://access.redhat.com/errata/RHSA-2018:3558
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