Impact
A partial path traversal issue exists within the functions load-file and load-resource. These functions can be limited to load files from a list of load paths.
Assuming Venice has been configured with the load paths: [ "/Users/foo/resources" ]
When passing relative paths to these two vulnerable functions everything is fine:
(load-resource "test.png") => loads the file "/Users/foo/resources/test.png"
(load-resource "../resources-alt/test.png") => rejected, outside the load path
When passing absolute paths to these two vulnerable functions Venice may return files outside the configured load paths:
(load-resource "/Users/foo/resources/test.png") => loads the file "/Users/foo/resources/test.png"
(load-resource "/Users/foo/resources-alt/test.png") => loads the file "/Users/foo/resources-alt/test.png" !!!
The latter call suffers from the Partial Path Traversal vulnerability.
This issue’s scope is limited to absolute paths whose name prefix matches a load path. E.g. for a load-path "/Users/foo/resources", the actor can cause loading a resource also from "/Users/foo/resources-alt", but not from "/Users/foo/images".
Versions of Venice before and including v1.10.16 are affected by this issue.
Patches
Upgrade to Venice >= 1.10.17, if you are on a version < 1.10.17
Workarounds
If you cannot upgrade the library, you can control the functions that can be used in Venice with a sandbox. If it is appropriate, the functions load-file and load-resource can be blacklisted in the sandbox.
References
For more information
If you have any questions or comments about this advisory:
Credits
I want to publicly recognize the contribution of Jonathan Leitschuh for reporting this issue.
References
JLLeitschuh Analyst
Impact
A partial path traversal issue exists within the functions
load-fileandload-resource. These functions can be limited to load files from a list of load paths.Assuming Venice has been configured with the load paths:
[ "/Users/foo/resources" ]When passing relative paths to these two vulnerable functions everything is fine:
(load-resource "test.png")=> loads the file "/Users/foo/resources/test.png"(load-resource "../resources-alt/test.png")=> rejected, outside the load pathWhen passing absolute paths to these two vulnerable functions Venice may return files outside the configured load paths:
(load-resource "/Users/foo/resources/test.png")=> loads the file "/Users/foo/resources/test.png"(load-resource "/Users/foo/resources-alt/test.png")=> loads the file "/Users/foo/resources-alt/test.png" !!!The latter call suffers from the Partial Path Traversal vulnerability.
This issue’s scope is limited to absolute paths whose name prefix matches a load path. E.g. for a load-path
"/Users/foo/resources", the actor can cause loading a resource also from"/Users/foo/resources-alt", but not from"/Users/foo/images".Versions of Venice before and including v1.10.16 are affected by this issue.
Patches
Upgrade to Venice >= 1.10.17, if you are on a version < 1.10.17
Workarounds
If you cannot upgrade the library, you can control the functions that can be used in Venice with a sandbox. If it is appropriate, the functions
load-fileandload-resourcecan be blacklisted in the sandbox.References
For more information
If you have any questions or comments about this advisory:
Credits
I want to publicly recognize the contribution of Jonathan Leitschuh for reporting this issue.
References