Bug 1563137 (CVE-2018-0493) - CVE-2018-0493 remctl: Use-after-free leading to a daemon crash, memory corruption, or arbitrary command execution.
Summary: CVE-2018-0493 remctl: Use-after-free leading to a daemon crash, memory corrup...
Keywords:
Status: CLOSED UPSTREAM
Alias: CVE-2018-0493
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1563139 1563140
Blocks:
TreeView+ depends on / blocked
 
Reported: 2018-04-03 08:57 UTC by Andrej Nemec
Modified: 2019-09-29 14:35 UTC (History)
3 users (show)

Fixed In Version: remctl 3.14
Doc Type: If docs needed, set a value
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Clone Of:
Environment:
Last Closed: 2019-06-10 10:19:26 UTC


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Description Andrej Nemec 2018-04-03 08:57:38 UTC
An incorrect memory management was found in the remctld and remctl-shell servers when handling commands with the sudo configuration option. For remctld, it may be possible (although appears to be difficult) for a client to execute arbitrary commands on the server. To exploit this vulnerability, the client must have access to run a command that uses the sudo configuration option. The client would then need to run the command using sudo multiple times in a single connection using keep-alive.

External References:

https://www.eyrie.org/~eagle/software/remctl/security/2018-04-01.html

Upstream patch:

https://git.eyrie.org/?p=kerberos/remctl.git;a=commit;h=86c7e44090c988112a37589d2c7a94029eb5e641

Comment 1 Andrej Nemec 2018-04-03 08:59:11 UTC
Created remctl tracking bugs for this issue:

Affects: fedora-all [bug 1563139]
Affects: epel-all [bug 1563140]

Comment 2 Product Security DevOps Team 2019-06-10 10:19:26 UTC
This CVE Bugzilla entry is for community support informational purposes only as it does not affect a package in a commercially supported Red Hat product. Refer to the dependent bugs for status of those individual community products.


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