Bug 1388378 (CVE-2016-8618) - CVE-2016-8618 curl: Double-free in curl_maprintf
Summary: CVE-2016-8618 curl: Double-free in curl_maprintf
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2016-8618
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: impact=moderate,public=20161102,repor...
Depends On: 1390896 1390894 1390895
Blocks: 1388393
TreeView+ depends on / blocked
 
Reported: 2016-10-25 08:21 UTC by Andrej Nemec
Modified: 2019-06-08 21:32 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 03:00:56 UTC


Attachments (Terms of Use)
Upstream patch (1.17 KB, patch)
2016-10-25 08:56 UTC, Andrej Nemec
no flags Details | Diff


Links
System ID Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2018:2486 None None None 2018-08-16 16:07:32 UTC
Red Hat Product Errata RHSA-2018:3558 None None None 2018-11-13 08:33:10 UTC

Description Andrej Nemec 2016-10-25 08:21:00 UTC
The libcurl API function called `curl_maprintf()` can be tricked into doing a
double-free due to an unsafe `size_t` multiplication, on systems using 32 bit
`size_t` variables. The function is also used internallty in numerous
situations.

The function doubles an allocated memory area with realloc() and allows the
size to wrap and become zero 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.

Systems with 64 bit versions of the `size_t` type are not affected by this
issue.

This behavior is triggable using the publicly exposed function.

External References:

https://curl.haxx.se/docs/adv_20161102D.html

Comment 1 Andrej Nemec 2016-10-25 08:56:11 UTC
Created attachment 1213773 [details]
Upstream patch

Comment 2 Adam Mariš 2016-11-02 08:26:59 UTC
Created curl tracking bugs for this issue:

Affects: fedora-all [bug 1390894]

Comment 3 Adam Mariš 2016-11-02 08:27:12 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 16:07:18 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 08:32:50 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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