Bug 1388386 (CVE-2016-8622) - CVE-2016-8622 curl: URL unescape heap overflow via integer truncation
Summary: CVE-2016-8622 curl: URL unescape heap overflow via integer truncation
Status: NEW
Alias: CVE-2016-8622
Product: Security Response
Classification: Other
Component: vulnerability   
(Show other bugs)
Version: unspecified
Hardware: All
OS: Linux
low
low
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard: impact=low,public=20161102,reported=2...
Keywords: Security
Depends On: 1390896 1390894 1390895
Blocks: 1388393
TreeView+ depends on / blocked
 
Reported: 2016-10-25 08:32 UTC by Andrej Nemec
Modified: 2019-04-14 12:58 UTC (History)
34 users (show)

Fixed In Version: curl 7.51.0
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Story Points: ---
Clone Of:
Environment:
Last Closed:
Type: ---
Regression: ---
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Documentation: ---
CRM:
Verified Versions:
Category: ---
oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---


Attachments (Terms of Use)
Upstream patch (4.25 KB, patch)
2016-10-25 09:02 UTC, Andrej Nemec
no flags Details | Diff


External Trackers
Tracker ID Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2018:2486 None None None 2018-08-16 16:07 UTC
Red Hat Product Errata RHSA-2018:3558 None None None 2018-11-13 08:33 UTC

Description Andrej Nemec 2016-10-25 08:32:56 UTC
The URL percent-encoding decode function in libcurl is called
`curl_easy_unescape`. Internally, even if this function would be made to
allocate a unscape destination buffer larger than 2GB, it would return that
new length in a signed 32 bit integer variable, thus the length would get
either just truncated or both truncated and turned negative. That could then
lead to libcurl writing outside of its heap based buffer.

This can be triggered by a user on a 64bit system if the user can send in a
custom (very large) URL to a libcurl using program.

External References:

https://curl.haxx.se/docs/adv_20161102H.html

Comment 1 Andrej Nemec 2016-10-25 09:02 UTC
Created attachment 1213778 [details]
Upstream patch

Comment 2 Adam Mariš 2016-11-02 08:28:46 UTC
Created curl tracking bugs for this issue:

Affects: fedora-all [bug 1390894]

Comment 3 Adam Mariš 2016-11-02 08:29:00 UTC
Created mingw-curl tracking bugs for this issue:

Affects: fedora-all [bug 1390895]
Affects: epel-7 [bug 1390896]

Comment 6 errata-xmlrpc 2018-08-16 16:07:41 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 7 errata-xmlrpc 2018-11-13 08:33:39 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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