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Bug 1642201 - (CVE-2018-16839) CVE-2018-16839 curl: Integer overflow leading to heap-based buffer overflow in Curl_sasl_create_plain_message()
CVE-2018-16839 curl: Integer overflow leading to heap-based buffer overflow i...
Status: NEW
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
All Linux
low Severity low
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Assigned To: Red Hat Product Security
: Security
Depends On: 1644553 1644554 1644552
Blocks: 1642204
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Reported: 2018-10-23 21:44 EDT by Sam Fowler
Modified: 2018-11-18 18:28 EST (History)
29 users (show)

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Fixed In Version: curl 7.62.0
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Description Sam Fowler 2018-10-23 21:44:16 EDT
Curl versions 7.33.0 to 7.61.1 are vulnerable to a buffer overrun in the SASL authentication code.

The internal function `Curl_auth_create_plain_message` fails to correctly
verify that the passed in lengths for name and password aren't too long, then
calculates a buffer size to allocate.

On systems with a 32 bit `size_t`, the math to calculate the buffer size
triggers an integer overflow when the user name length exceeds 2GB (2^31
bytes). This integer overflow usually causes a very small buffer to actually
get allocated instead of the intended very huge one, making the use of that
buffer end up in a heap buffer overflow.
Comment 1 Sam Fowler 2018-10-23 21:44:33 EDT

Name: the Curl project
Upstream: Harry Sintonen
Comment 3 Sam Fowler 2018-10-31 03:00:53 EDT
Created curl tracking bugs for this issue:

Affects: fedora-all [bug 1644552]

Created mingw-curl tracking bugs for this issue:

Affects: epel-7 [bug 1644553]
Comment 5 Tomas Hoger 2018-11-15 16:23:48 EST
As noted above, this problem was introduced in Curl version 7.33.0 via the following commit:


Prior to that commit, the username and password lengths were limited to  MAX_CURL_USER_LENGTH or MAX_CURL_PASSWORD_LENGTH, i.e. to 256 characters.

This did not affect curl packages in Red Hat Enterprise Linux 7 and earlier, which are based on upstream Curl versions prior to 7.33.0.

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