CVE-2024-35196

LOW2.0EPSS 0.09%

Slack integration leaks sensitive information in logs

Published: 6/2/2024Modified: 6/2/2024

Description

### Impact Sentry's Slack integration incorrectly records the incoming request body in logs. This request data can contain sensitive information, including the [deprecated Slack verification token](https://api.slack.com/authentication/verifying-requests-from-slack#deprecation). With this verification token, it is possible under specific configurations, an attacker can forge requests and act as the Slack integration. The request body is leaked in log entries matching `event == "slack.*" && name == "sentry.integrations.slack" && request_data == *`. The deprecated slack verification token, will be found in the `request_data.token` key. Example event: ```json { "name": "sentry.integrations.slack", "level": "info", "event": "slack.event.message", # This could be any of the `slack.*` events "request_data": { # Other keys are omitted for brevity "token": "<MyDeprecatedSlackVerificationToken>", } } ``` ### Patches - **SaaS users** do not need to take any action. - **Self-hosted users** should upgrade to version 24.5.0 or higher, [rotate their Slack verification token](https://api.slack.com/authentication/verifying-requests-from-slack#regenerating), and [use the Slack Signing Secret instead of the verification token](https://develop.sentry.dev/integrations/slack/). - If you are only using the `slack.signing-secret` in your self-hosted configuration, then the legacy verification token is not used to verify the webhook payload. It is ignored. > ⚠️ Sentry's support for validating Slack requests via the legacy verification token will be deprecated in version 24.7.0. ### Workarounds #### Option 1 Set the `slack.signing-secret` instead of `slack.verification-token`. The [signing secret](https://api.slack.com/authentication/verifying-requests-from-slack#app-management-updates) is Slack's recommended way of authenticating webhooks. By having `slack.singing-secret` set, Sentry self-hosted will no longer use the verification token for authentication of the webhooks, regardless of whether `slack.verification-token` is set or not. #### Option 2 The deprecated Slack verification token is leaked in log levels of `INFO` and `ERROR` in the Slack integration. If the self-hosted instance is unable to be upgraded or re-configured to use the `slack.signing-secret`, the logging configuration can be adjusted to not generate logs from the integration. The [default logging configuration can be found in `src/sentry/conf/server.py`](https://github.com/getsentry/sentry/blob/17d2b87e39ccd57e11da4deed62971ff306253d1/src/sentry/conf/server.py#L1307). **Services should be restarted once the configuration change is saved.** Below you'll find an example of the configuration adjustments necessary to remove the Slack integration logs: ```python # src/sentry/conf/server.py ... LOGGING: LoggingConfig = { ... handlers: { # the line below already exists in the default configuration "null": {"class": "logging.NullHandler"}, ... }, "loggers": { "sentry.integrations.slack": { "handlers": ["null"], # route logs to null handler "level": "CRITICAL", # prevent generation of logs a lower levels (ex. ERROR and INFO) }, ... }, } ``` ### References - https://github.com/getsentry/sentry/pull/70508 - [Sentry Slack Integration Documentation for Self-Hosted users](https://develop.sentry.dev/integrations/slack/) - [Documentation on Slack Signing Secrets](https://api.slack.com/authentication/verifying-requests-from-slack#app-management-updates) - [Slack Deprecation for Verification Tokens](https://api.slack.com/authentication/verifying-requests-from-slack#deprecation)

Affected packages (1)

CVSS scores

SourceVersionSeverityVector
osvCVSS 3.1LOW2.0CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:L/I:N/A:N

References (9)