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Category:   Application (Generic)  >   cURL Vendors:
(Oracle Issues Fix for Oracle Linux) libcurl Integer Overflow in Escape Functions May Let Users Execute Arbitrary Code on the Target System
SecurityTracker Alert ID:  1039121
SecurityTracker URL:
CVE Reference:   CVE-2016-7167   (Links to External Site)
Date:  Aug 10 2017
Impact:   Execution of arbitrary code via local system, Execution of arbitrary code via network, User access via local system, User access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): libcurl 7.11.1 - 7.50.2
Description:   A vulnerability was reported in libcurl. A user can execute arbitrary code on the target system.

A user can supply a specially crafted length parameter value to certain libcurl functions to trigger an integer overflow and execute arbitrary code on the target system.

The curl_escape(), curl_easy_escape(), curl_unescape(), and curl_easy_unescape() functions are affected.

The specific impact depends on the application using libcurl.

The curl command line tool is not affected.

The Mitre CVE Assignment Team reported this vulnerability.

Impact:   A user can execute arbitrary code on the target system.
Solution:   Oracle has issued a fix.

The Oracle Linux advisory is available at:

Vendor URL: (Links to External Site)
Cause:   Boundary error
Underlying OS:  Linux (Oracle)
Underlying OS Comments:  7

Message History:   This archive entry is a follow-up to the message listed below.
Sep 15 2016 libcurl Integer Overflow in Escape Functions May Let Users Execute Arbitrary Code on the Target System

 Source Message Contents

Subject:  [El-errata] ELSA-2017-2016 Moderate: Oracle Linux 7 curl security, bug fix, and enhancement update

Oracle Linux Security Advisory ELSA-2017-2016

The following updated rpms for Oracle Linux 7 have been uploaded to the 
Unbreakable Linux Network:



Description of changes:

- fix use of uninitialized variable detected by Covscan

- make FTPS work with --proxytunnel (#1420327)

- make FTPS work with --proxytunnel (#1420327)

- work around race condition in PK11_FindSlotByName() in NSS (#1404815)

- make FTPS work with --proxytunnel (#1420327)

- fix tight loop in non-blocking TLS handhsake over proxy (#1388162)
- handle cookies with numerical IPv6 address (#1341503)
- make libcurl recognize chacha20-poly1305 and SHA384 cipher-suites 
- curl -E: allow to escape ':' in cert nickname (#1376062)
- run automake in %prep to avoid patching files from now on

- reject negative string lengths in curl_easy_[un]escape() (CVE-2016-7167)

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