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
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2016-8622
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
low
low
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 08:32 UTC by Andrej Nemec
Modified: 2021-02-17 03:07 UTC (History)
34 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 03:01:03 UTC
Embargoed:

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


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2018:2486 0 None None None 2018-08-16 16:07:57 UTC
Red Hat Product Errata RHSA-2018:3558 0 None None None 2018-11-13 08:33:55 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 09:02:01 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
Note You need to log in before you can comment on or make changes to this bug.