Bug 1388379 (CVE-2016-8619)

Summary: CVE-2016-8619 curl: Double-free in krb5 code
Product: [Other] Security Response Reporter: Andrej Nemec <anemec>
Component: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Status: CLOSED ERRATA QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: bmcclain, bodavis, cfergeau, csutherl, dbhole, dblechte, eedri, erik-fedora, gzaronik, hhorak, jclere, jorton, kanderso, kdudka, lgao, lsurette, luhliari, mbabacek, mgoldboi, michal.skrivanek, mike, mturk, myarboro, omajid, paul, rh-spice-bugs, rwagner, security-response-team, sherold, slawomir, srevivo, twalsh, weli, ykaul, yozone
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: curl 7.51.0 Doc Type: If docs needed, set a value
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2019-06-08 03:00:59 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On: 1390894, 1390895, 1390896    
Bug Blocks: 1388393    
Attachments:
Description Flags
Upstream patch none

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