Bug 1670256 (CVE-2019-3823) - CVE-2019-3823 curl: SMTP end-of-response out-of-bounds read
Summary: CVE-2019-3823 curl: SMTP end-of-response out-of-bounds read
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2019-3823
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: 1672906 1674362 1674363
Blocks: 1670258
TreeView+ depends on / blocked
 
Reported: 2019-01-29 04:29 UTC by Sam Fowler
Modified: 2021-02-16 22:28 UTC (History)
29 users (show)

Fixed In Version: curl 7.64.0
Doc Type: If docs needed, set a value
Doc Text:
An out-of-bounds read flaw was found in the way curl handled certain SMTP responses. A remote attacker could use this flaw to crash curl.
Clone Of:
Environment:
Last Closed: 2019-11-06 00:52:03 UTC
Embargoed:

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Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2019:3701 0 None None None 2019-11-05 22:06:11 UTC

Description Sam Fowler 2019-01-29 04:29:19 UTC 
libcurl versions from 7.34.0 to before 7.64.0 are vulnerable to a heap out-of-bounds read in the code handling the end-of-response for SMTP.

If the buffer passed to `smtp_endofresp()` isn't NUL terminated and contains no character ending the parsed number, and `len` is set to 5, then the `strtol()` call reads beyond the allocated buffer. The read contents will not be returned to the caller.


Bug introduced by:

https://github.com/curl/curl/commit/2766262a68
Comment 1 Sam Fowler 2019-01-29 04:29:20 UTC 
Acknowledgments:

Name: Daniel Stenberg (the Curl project)
Upstream: Brian Carpenter (Geeknik Labs)
Comment 2 Sam Fowler 2019-02-06 07:50:34 UTC 
External Reference:

https://curl.haxx.se/docs/CVE-2019-3823.html


Upstream Patch:

https://github.com/curl/curl/commit/39df4073
Comment 3 Sam Fowler 2019-02-06 07:50:47 UTC 
Created curl tracking bugs for this issue:

Affects: fedora-all [bug 1672906]
Comment 4 Huzaifa S. Sidhpurwala 2019-02-11 06:37:16 UTC 
Mitigation:

Do not use SMTP authentication with curl
Comment 9 errata-xmlrpc 2019-11-05 22:06:10 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2019:3701 https://access.redhat.com/errata/RHSA-2019:3701
Comment 10 Product Security DevOps Team 2019-11-06 00:52:03 UTC 
This bug is now closed. Further updates for individual products will be reflected on the CVE page(s):

https://access.redhat.com/security/cve/cve-2019-3823
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