Facebook Google Plus Twitter LinkedIn YouTube RSS Menu Search Resource - BlogResource - WebinarResource - ReportResource - Eventicons_066 icons_067icons_068icons_069icons_070

Tenable 部落格

訂閱
  • Twitter
  • Facebook
  • LinkedIn

Slack 修補 Windows 桌面應用程式的下載檔案竄改弱點

Slack 修補 Windows 桌面應用程式的下載檔案竄改弱點

Tenable Researcher David Wells discovered a vulnerability in Slack Desktop for Windows that could have allowed an attacker to alter where files downloaded within Slack are stored. Tenable worked with Slack via HackerOne based on our coordinated disclosure policy and Slack has since released a new version of its Windows desktop client to address this vulnerability. Users should ensure their Slack desktop application is up to date.

Background

Tenable Research discovered a download hijack vulnerability in Slack Desktop version 3.3.7 for Windows. This vulnerability, which has been patched, would have allowed an attacker to post a crafted hyperlink into a Slack channel or private conversation that changes the document download location path when clicked. It does require user interaction to exploit, giving it a CVSSv2 score of 5.5 (Medium). 

Slack has 10 million active users every day and 85,000 organizations use the paid version. We cannot confirm how many of those are Windows App users.

Analysis

An attacker can abuse the "slack://" protocol handler, which has the capability to change sensitive settings in the Slack Desktop Application. A crafted link like  “slack://settings/?update={‘PrefSSBFileDownloadPath’:’<pathHere>’}” will change the default download location. This download path can be an attacker-owned SMB share, which would cause all future documents downloaded in Slack to be instantly uploaded to the attacker's server. The attacker could also manipulate the contents of the documents after download before the victim opens them. 

The hyperlink text can be masqueraded by using the "attachment" feature in Slack, which allows an attacker to replace the hyperlink’s actual uniform resource identifier with any custom text, possibly fooling users into clicking.

Vendor response

Tenable reported to Slack a vulnerability related to the Slack Desktop Application for Windows via HackerOne. Slack patched the bug as part of its latest update for Slack Desktop Application for Windows, v3.4.0. Slack investigated and found no indication that this vulnerability was ever utilized, nor reports that its users were impacted. As always, users are encouraged to upgrade their apps and clients to the latest available version.

Impact

Attack scenarios:

The attack can be performed through any Slack direct messaging or Slack channel to which an attacker might be authenticated. Using this attack vector, an insider could exploit this vulnerability for corporate espionage, manipulation, or to gain access to documents outside of their purview. 

While less effective, these hyperlink attacks could be done without Slack channel authentication, via external .rss feeds or other content pulled into a Slack channel from an external source that may contain attacker-crafted hyperlinks. This attack could be launched by someone outside of the organization but there are variables that might reduce the chances of success, like knowing which .rss feeds the target Slack subscribes to. 

Once the download path has been altered, the attacker can not only steal documents downloaded in the Slack Application, they can also manipulate the documents. For example, if financial documents like invoices are downloaded, the attacker could not only read account numbers but also change them. Additionally, if an Office Document (Word, Excel, etc.) is downloaded, the attacker's server could inject malware into it, so that when opened, the victim machine is compromised.

解決方案

Confirm that your Slack for Windows is updated to version 3.4.0. Administrators of Slack deployed via Microsoft Install can read here for more information on how to manually update.

Additional information

Learn more about Tenable, the first Cyber Exposure platform for holistic management of your modern attack surface. Get a free 60-day trial of Tenable.io Vulnerability Management.

相關文章

您是否容易受到最新攻擊程式危害?

輸入您的電子郵件地址,以便收到最新 cyber exposure 警示。

免費試用 立即購買

選擇 Tenable.io

免費試用 30 天

享受現代、雲端型的弱點管理平台,能夠以無與倫比的準確性查看和追蹤所有資產。 立即註冊。

立即購買 Tenable.io

享受現代、雲端型的弱點管理平台,使您能夠以無與倫比的準確性查看和追蹤所有資產。 立即訂閱一年。

65 項資產

選取您的訂閱選項:

立即購買
免費試用 立即購買

免費試用 Nessus Professional

免費試用 7 天

Nessus® 是現今市場上功能最全面的弱點掃描工具。Nessus Professional 能協助自動化弱點掃描程序、節省您達到合規性的時間並讓您的 IT 團隊合作。

購買 Nessus Professional

Nessus® 是現今市場上功能最全面的弱點掃描工具。Nessus Professional 能協助自動化弱點掃描程序、節省您達到合規性的時間並讓您的 IT 團隊合作。

購買多年期授權,節省更多。新增 365 天全年無休 24 小時全天候可使用電話、社群及對談的進階支援。完整詳情請見此處。

免費試用 立即購買

試用 Tenable.io Web Application Scanning

免費試用 30 天

享受我們專為現代應用程式而設計,屬於 Tenable.io 平台一部分的最新 Web 應用程式掃描產品的所有功能。不需耗費大量人力或中斷重要 Web 應用程式,即可高度準確且安全地掃描您整個線上產品系列中是否含有任何弱點。 立即註冊。

購買 Tenable.io Web Application Scanning

享受現代、雲端型的弱點管理平台,使您能夠以無與倫比的準確性查看和追蹤所有資產。 立即訂閱一年。

5 個 FQDN

$3,578

立即購買

免費試用 聯絡業務人員

試用 Tenable.io Container Security

免費試用 30 天

享受整合至弱點管理平台中的唯一容器安全產品的完整功能。監控容器映像中是否有弱點、惡意軟體及政策違規的情形。與持續整合和持續部署 (CI/CD) 系統整合,以支援 DevOps 作法、加強安全性並支援企業政策合規性。

購買 Tenable.io Container Security

Tenable.io Container Security 整合了建置程序,能提供包含弱點、惡意軟體和政策違規等容器影像安全性的能見度,讓您無縫並安全地啟用 DevOps 流程。

取得 Tenable.sc 產品示範

請填寫以下表格並附上您的聯絡資訊,我們的業務代表將盡快與您聯絡,以安排產品示範。您也可以附上簡短註解 (字元上限為 255 個)。請注意,標示星號 (*) 的欄位是必填欄位。

免費試用 聯絡業務人員

試用 Tenable Lumin

免費試用 30 天

透過 Tenable Lumin,能夠以視覺方式呈現 Cyber Exposure 並加以探索,長期追蹤風險降低狀況,以及對照同業進行指標分析。

購買 Tenable Lumin

聯絡業務代表,瞭解 Lumin 如何協助您獲得整個企業的深入洞見,並管理網路風險。

申請 Tenable.ot 產品示範

取得您所需要的操作技術安全性。
降低您無法處理的風險。