Bug 1860344 (CVE-2020-14397) - CVE-2020-14397 libvncserver: libvncserver/rfbregion.c has a NULL pointer dereference
Summary: CVE-2020-14397 libvncserver: libvncserver/rfbregion.c has a NULL pointer dere...
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2020-14397
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: 1860345 1860346 1861150 1861151 1861152 1861153
Blocks: 1860332
TreeView+ depends on / blocked
 
Reported: 2020-07-24 10:45 UTC by Marian Rehak
Modified: 2021-05-18 15:16 UTC (History)
4 users (show)

Fixed In Version: libvncserver 0.9.13
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Clone Of:
Environment:
Last Closed: 2021-05-18 14:35:07 UTC
Embargoed:

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Description Marian Rehak 2020-07-24 10:45:15 UTC 
An issue was discovered in LibVNCServer before 0.9.13. libvncserver/rfbregion.c has a NULL pointer dereference.

Upstream commit:

https://github.com/LibVNC/libvncserver/commit/38e98ee61d74f5f5ab4aa4c77146faad1962d6d0
Comment 1 Marian Rehak 2020-07-24 10:51:55 UTC 
Created libvncserver tracking bugs for this issue:

Affects: epel-7 [bug 1860346]
Affects: fedora-all [bug 1860345]
Comment 2 Todd Cullum 2020-07-27 22:52:51 UTC 
libvncserver/rfbregion.c's sraSpanInsertAfter(), sraSpanInsertBefore(), sraSpanRemove() and libvncserver/rfbserver.c's rfbClientIteratorNext(), and rfbReleaseClientIterator() are missing NULL checks for sraSpan * and rfbClientIteratorPtr parameters. If one of them is NULL, this could cause a crash.
Comment 5 Product Security DevOps Team 2021-05-18 14:35:07 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-2020-14397
Comment 6 errata-xmlrpc 2021-05-18 15:16:20 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2021:1811 https://access.redhat.com/errata/RHSA-2021:1811
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