Bug 1368369 (CVE-2016-6866) - CVE-2016-6866 slock: Null pointer dereference results in segmentation fault
Summary: CVE-2016-6866 slock: Null pointer dereference results in segmentation fault
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2016-6866
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: 1368370
Blocks:
TreeView+ depends on / blocked
 
Reported: 2016-08-19 08:28 UTC by Andrej Nemec
Modified: 2019-09-29 13:55 UTC (History)
2 users (show)

Fixed In Version:
Doc Type: If docs needed, set a value
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Clone Of:
Environment:
Last Closed: 2016-11-25 08:19:11 UTC
Embargoed:

Attachments (Terms of Use)
Upstream fix (1.35 KB, patch)
2016-08-31 06:07 UTC, Petr Pisar 		no flags Details | Diff
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Description Andrej Nemec 2016-08-19 08:28:01 UTC 
The screen locking application slock (http://tools.suckless.org/slock/)
calls crypt(3) and uses the return value for strcmp(3) without checking
to see if the return value of crypt(3) was a NULL pointer. If the hash
returned by (getspnam()->sp_pwdp) is invalid, crypt(3) will return NULL
and set errno to EINVAL. This will cause slock to segfault which then
leaves the machine unprotected.

References:

http://seclists.org/oss-sec/2016/q3/328
http://s1m0n.dft-labs.eu/files/slock/
Comment 1 Andrej Nemec 2016-08-19 08:28:24 UTC 
Created slock tracking bugs for this issue:

Affects: fedora-all [bug 1368370]
Comment 2 Petr Pisar 2016-08-31 06:07:00 UTC 
Created attachment 1196223 [details]
Upstream fix
Comment 3 Fedora Update System 2016-09-05 17:53:21 UTC 
slock-1.3-2.fc25 has been pushed to the Fedora 25 stable repository. If problems still persist, please make note of it in this bug report.
Comment 4 Fedora Update System 2016-09-09 16:53:12 UTC 
slock-1.3-2.fc23 has been pushed to the Fedora 23 stable repository. If problems still persist, please make note of it in this bug report.
Comment 5 Fedora Update System 2016-09-09 16:54:34 UTC 
slock-1.3-2.fc24 has been pushed to the Fedora 24 stable repository. If problems still persist, please make note of it in this bug report.
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