Bug 1841574 (CVE-2020-13632) - CVE-2020-13632 sqlite: NULL pointer dereference in ext/fts3/fts3_snippet.c via a crafted matchinfo() query
Summary: CVE-2020-13632 sqlite: NULL pointer dereference in ext/fts3/fts3_snippet.c vi...
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2020-13632
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:
Depends On: 1841575 1841576 1841577 1845572 1845615
Blocks: 1841236
TreeView+ depends on / blocked
 
Reported: 2020-05-29 13:39 UTC by Guilherme de Almeida Suckevicz
Modified: 2021-05-19 09:54 UTC (History)
13 users (show)

Fixed In Version: sqlite 3.32.0
Clone Of:
Environment:
Last Closed: 2020-11-04 02:25:39 UTC
Embargoed:

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Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2020:4442 0 None None None 2020-11-04 01:00:00 UTC

Description Guilherme de Almeida Suckevicz 2020-05-29 13:39:06 UTC 
ext/fts3/fts3_snippet.c in SQLite before 3.32.0 has a NULL pointer dereference via a crafted matchinfo() query.

Reference and upstream commit:
https://sqlite.org/src/info/a4dd148928ea65bd
Comment 1 Guilherme de Almeida Suckevicz 2020-05-29 13:39:35 UTC 
Created mingw-sqlite tracking bugs for this issue:

Affects: fedora-all [bug 1841575]


Created sqlite tracking bugs for this issue:

Affects: fedora-all [bug 1841577]


Created sqlite2 tracking bugs for this issue:

Affects: fedora-all [bug 1841576]
Comment 4 Mauro Matteo Cascella 2020-06-09 15:56:08 UTC 
According to the documentation, FTS3 is an extension module that allows users to create special virtual tables with a built-in full-text index to efficiently perform full-text searches on a set of documents (https://www.sqlite.org/fts3.html). Under some circumstances it is possible for a SQL SELECT statement to cause a NULL pointer dereference while performing a full-text query on FTS3 virtual tables using the matchinfo function (https://www.sqlite.org/fts3.html#matchinfo). This may occur in function fts3ColumnlistCount() in fts3_snippet.c, when the pEnd pointer ends up being set to 0 in a while loop. For this attack to be successful, an attacker would need to have a level of access that allows him to write particular SQL expressions that use the matchinfo function to perform full-text queries on FTS3 tables.
Comment 5 Mauro Matteo Cascella 2020-06-09 16:16:17 UTC 
Function fts3ExprLHits() in fts3_snippet.c was responsible for calling fts3ColumnlistCount() with an invalid pointer. The former was introduced in SQLite upstream version 3.8.11 with the following commit:
  -> https://github.com/sqlite/sqlite/commit/e60aedc564c6f7291143b33a90869529b1676b35

It was fixed in upstream version 3.32.0 (see Comment 0).
Comment 6 Mauro Matteo Cascella 2020-06-09 16:18:13 UTC 
Statement:

This flaw did not affect the versions of SQLite as shipped with Red Hat Enterprise Linux 7 as they did not include the vulnerable code, which was introduced in a later version of the package.
Comment 8 errata-xmlrpc 2020-11-04 01:00:16 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2020:4442 https://access.redhat.com/errata/RHSA-2020:4442
Comment 9 Product Security DevOps Team 2020-11-04 02:25:39 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-2020-13632
Comment 10 errata-xmlrpc 2021-05-18 16:30:10 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2021:1968 https://access.redhat.com/errata/RHSA-2021:1968
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