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GHSA-8v9w-p43c-r885
No affected components available
Impact
When parsing untrusted rulex expressions, rulex may crash, possibly enabling a Denial of Service attack. This happens when the expression contains a multi-byte UTF-8 code point in a string literal or after a backslash, because rulex tries to slice into the code point and panics as a result.
This is a security concern for you, if
- your service parses untrusted rulex expressions (expressions provided by an untrusted user), and
- your service becomes unavailable when the thread running rulex panics.
Patches
The crashes are fixed in version 0.4.3. Affected users are advised to update to this version.
Workarounds
You can use catch_unwind to recover from panics.
For more information
If you have any questions or comments about this advisory:
- Open an issue in rulex
- Email me at ludwig.stecher@gmx.de
Credits
Credit for finding these bugs goes to
The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker needs basic access or low-level privileges. No user interaction is needed for the attacker to exploit this vulnerability. The impact is confined to the system where the vulnerability exists. There is a high impact on the availability of the system.
Exploitation attempts have been detected. Elevated vigilance and prompt remediation are advised.
The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.
We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.
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