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Date: Mon, 10 Dec 2018 01:50:16 +0100
From: Daniel Beck <ml@...kweb.net>
To: oss-security@...ts.openwall.com
Subject: Re: Multiple vulnerabilities in Jenkins
> On 5. Dec 2018, at 10:18, Daniel Beck <ml@...kweb.net> wrote:
>
> SECURITY-595
> Jenkins uses the Stapler web framework for HTTP request handling.
> Stapler’s basic premise is that it uses reflective access to code
> elements matching its naming conventions. For example, any public method
> whose name starts with get, and that has a String, int, long, or no
> argument can be invoked this way on objects that are reachable through
> these means. As these naming conventions closely match common code
> patterns in Java, accessing crafted URLs could invoke methods never
> intended to be invoked this way.
>
> The Stapler web framework has been extended with a Service Provider
> Interface (SPI) that allows methods and fields to be excluded from routing.
> The implementation of that SPI in Jenkins now restricts which getter
> methods, do* action methods, and fields can be invoked reflectively by
> Stapler.
CVE-2018-1000861
> SECURITY-1072
> The fix for SECURITY-499 introduced a mechanism that renamed user
> directories on disk as a user with an unsafe user name (user ID) is loaded.
> Insufficient input validation allowed attackers to rename such user
> directories even for users with a safe user name by submitting a crafted
> user name when attempting to log in, even with an invalid password. Doing
> so prevented users from logging in successfully afterwards.
>
> Jenkins no longer uses directory names as a reference for user names,
> making the on-load migration of user records unnecessary. Instead, the
> new file users/users.xml is used to map user names to the directories
> containing the user metadata.
CVE-2018-1000863
> SECURITY-904
> The file browser used for workspaces, archived artifacts, and
> $JENKINS_HOME/userContent/ followed symbolic links to locations outside
> the directory being browsed.
>
> While builds typically have access to the file system outside the
> workspace allocated by Jenkins, this should not extend to beyond the
> execution of a build on that agent. Notably, the configuration may have
> been changed to not allow a build to run on a given agent, but the
> workspace used during the previous execution still exists, and could
> allow browsing the file system outside the workspace.
>
> Neither browsing through the UI nor downloading directory content as a
> ZIP file allow accessing directories and files outside the workspace
> anymore.
CVE-2018-1000862
> SECURITY-1193
> The form validation for cron expressions (e.g. "Poll SCM", "Build
> periodically") could enter infinite loops when cron expressions only
> matching certain rare dates were entered, blocking request handling
> threads indefinitely.
CVE-2018-1000864
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