Bamboo Security Advisory 2017-12-13

Bamboo - Various vulnerabilities - CVE-2017-14589, CVE-2017-14590

Note: As of September 2014 we are no longer issuing binary bug patches, instead we create new maintenance releases for the major versions we are backporting.

脆弱性の概要

This advisory discloses critical severity security vulnerabilities which affects Bamboo. All versions of Bamboo before 6.1.6 (the fixed version for 6.1.x) and from 6.2.0 before 6.2.5 (the fixed version for 6.2.x) are affected by these vulnerabilities. 

Remote code execution through OGNL double evaluation (CVE-2017-14589)

深刻度

アトラシアンはアトラシアンの深刻度レベルで公開されているスケールに従って、この脆弱性の深刻度レベルを重大として評価しています。このスケールによって、深刻度を重大、高度、中度、低度として評価できます。

これはアトラシアンの評価であり、お客様自身の IT 環境への適用性を評価する必要があります。

説明

It was possible for double OGNL evaluation in FreeMarker templates through Struts FreeMarker tags to occur. An attacker who has restricted administration rights to Bamboo or who hosts a website that a Bamboo administrator visits, is able to exploit this vulnerability to execute Java code of their choice on systems that run a vulnerable version of Bamboo.

All versions of Bamboo before 6.1.6 (the fixed version for 6.1.x) and from 6.2.0 before 6.2.5 (the fixed version for 6.2.x) are affected by this vulnerability. This issue can be tracked here: https://jira.atlassian.com/browse/BAM-18842

謝辞

Atlassian would like to credit Sebastian Perez for reporting this issue to us.

問題の軽減策

This issue cannot be mitigated.

Argument injection in Mercurial repository handling (CVE-2017-14590)

深刻度

アトラシアンはアトラシアンの深刻度レベルで公開されているスケールに従って、この脆弱性の深刻度レベルを重大として評価しています。このスケールによって、深刻度を重大、高度、中度、低度として評価できます。

これはアトラシアンの評価であり、お客様自身の IT 環境への適用性を評価する必要があります。

説明

Bamboo did not check that the name of a branch in a Mercurial repository contained argument parameters. An attacker who has permission to do one or more of the following:

• create a repository in Bamboo
• edit an existing plan in Bamboo that has a non-linked Mercurial repository
• create or edit a plan in Bamboo when there is at least one linked Mercurial repository that the attacker has permission to use
• commit to a Mercurial repository used by a Bamboo plan which has branch detection enabled

can execute code of their choice on systems that run a vulnerable version of Bamboo Server.

Versions of Bamboo starting with 2.7.0 before 6.1.6 (the fixed version for 6.1.x) and from 6.2.0 before 6.2.5 (the fixed version for 6.2.x) are affected by this vulnerability. This issue can be tracked here:  https://jira.atlassian.com/browse/BAM-18843

謝辞

Atlassian would like to credit Zhang Tianqi @ Tophant for reporting this issue to us.

問題の軽減策

Disable the "Atlassian Bamboo Mercurial Repository Plugin" via the Addons menu in the Administration section.

修正

弊社ではこれらの課題に対応するために次の対応を行いました。

1. Released Bamboo version 6.2.5 that contains a fix for these issues and can be downloaded from https://www.atlassian.com/software/bamboo/download.
2. Released Bamboo version 6.1.6 that contains a fix for these issues and can be downloaded from https://www.atlassian.com/software/bamboo/download-archives.

必要なアクション

Atlassian recommends that you upgrade to the latest version. For a full description of the latest version of Bamboo, see the release notes. You can download the latest version of Bamboo from the download centre.

Upgrade Bamboo to version 6.2.5 or higher.

If you are running Bamboo 6.1.x and cannot upgrade to 6.2.5 then upgrade to version 6.1.6.

サポート

このアドバイザリのメールを受信していないため今後の受信を希望する場合は、https://my.atlassian.com/email にアクセスしてアラート メールにご登録ください。

この勧告に関してご質問や懸念がある場合は、https://support.atlassian.com/ja/ でサポート リクエストを作成してください。

参考