CVE-2021-32659

描述

### Impact If a bridge has room upgrade handling turned on in the configuration (the `roomUpgradeOpts` key when instantiating a new `Bridge` instance.), any `m.room.tombstone` event it encounters will be used to unbridge the current room and bridge into the target room. However, the target room `m.room.create` event is not checked to verify if the `predecessor` field contains the previous room. This means that any mailcious admin of a bridged room can repoint the traffic to a different room without the new room being aware. ### Patches Versions 2.6.1 and greater are patched. ### Workarounds Disabling the automatic room upgrade handling can be done by removing the `roomUpgradeOpts` key from the `Bridge` class options. ### References The issue is patched by https://github.com/matrix-org/matrix-appservice-bridge/pull/330 ### For more information] If you have any questions or comments about this advisory, email us at [email protected].

如何修補 CVE-2021-32659

要修補 CVE-2021-32659,請將受影響套件升級到下列已修補版本。

• —升級至 2.6.1 或更新版本

CVE-2021-32659 正在被利用嗎?

低 — EPSS 為 0.3%,目前沒有觀察到大規模利用活動。

受影響套件(1)

• from 0, < 2.6.1

CVSS 分數

參考連結(5)

• ADVISORYnvd.nist.gov/vuln/detail/CVE-2021-32659
• WEBgithub.com/matrix-org/matrix-appservice-bridge/commit/b69e745584a34fcfd858df33e4631e420da07b9f
• WEBgithub.com/matrix-org/matrix-appservice-bridge/pull/330
• WEBgithub.com/matrix-org/matrix-appservice-bridge/releases/tag/2.6.1