Bug 1848539 (CVE-2020-14147)

Summary:	CVE-2020-14147 redis: integer overflow in the getnum function in lua_struct.c could lead to a DoS
Product:	[Other] Security Response	Reporter:	Marian Rehak <mrehak>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED WONTFIX	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	apevec, fabian.deutsch, jal233, jjoyce, jschluet, lberk, lhh, lpeer, mburns, mgoodwin, nathans, rcollet, redis-maint, sclewis, slinaber
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2021-10-28 01:56:53 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	1848540, 1848541, 1849957, 1854280
Bug Blocks:	1848543

Description Marian Rehak 2020-06-18 13:55:56 UTC

An integer overflow in the getnum function in lua_struct.c in Redis before 6.0.3 allows context-dependent attackers with permission to run Lua code in a Redis session to cause a denial of service (memory corruption and application crash) or possibly bypass intended sandbox restrictions via a large number, which triggers a stack-based buffer overflow. NOTE: this issue exists because of a CVE-2015-8080 regression.

Upstream Commit:

https://github.com/antirez/redis/commit/ef764dde1cca2f25d00686673d1bc89448819571

Comment 1 Marian Rehak 2020-06-18 13:57:08 UTC

Created redis tracking bugs for this issue:

Affects: epel-all [bug 1848541]
Affects: fedora-all [bug 1848540]

Comment 3 Summer Long 2020-06-19 05:05:24 UTC

Mitigation:

There is no known mitigation for this issue, the flaw can only be resolved by applying updates.

Comment 4 lnacshon 2020-06-23 09:32:50 UTC

CCX are using redis==3.4.1

Comment 6 Huzaifa S. Sidhpurwala 2020-07-07 04:47:34 UTC

This issue was originally reported as "redis: Integer wraparound in lua_struct.c causing stack-based buffer overflow" and was assigned CVE-2015-8080. However https://github.com/redis-io/redis/commit/1eb08bcd4634ae42ec45e8284923ac048beaa4c3 applied to redis-5.0.0 and redis-6.0.0 reversed this commit and made the package vulnerable again.

It was further noticed via https://github.com/redis-io/redis/pull/6875 and CVE-2020-14147 has been assigned. CVE-2020-14147 is essentially a regression to the original 2015 CVE.

Currently no new upstream release is made to fix this flaw, but a committed patch is available.

Comment 8 Nathan Scott 2020-07-07 06:07:04 UTC

(In reply to Huzaifa S. Sidhpurwala from comment #6)
> [...]
> Currently no new upstream release is made to fix this flaw, but a committed
> patch is available.

The upstream redis-5.0.9 release contains this fix:
http://download.redis.io/releases/redis-5.0.9.tar.gz