CVE-2024-32645: vyper performs incorrect topic logging in raw_log
First published: Thu Apr 25 2024(Updated: )
### Summary Incorrect values can be logged when `raw_log` builtin is called with memory or storage arguments to be used as topics. A contract search was performed and no vulnerable contracts were found in production. In particular, no uses of `raw_log()` were found at all in production; it is apparently not a well-known function. ### Details The `build_IR` function of the `RawLog` class fails to properly unwrap the variables provided as topics. Consequently, incorrect values are logged as topics. ### PoC ```vyper x: bytes32 @external def f(): self.x = 0x1234567890123456789012345678901234567890123456789012345678901234 raw_log([self.x], b"") # LOG1(offset:0x60, size:0x00, topic1:0x00) y: bytes32 = 0x1234567890123456789012345678901234567890123456789012345678901234 raw_log([y], b"") # LOG1(offset:0x80, size:0x00, topic1:0x40) ``` ### Impact Incorrect values can be logged which may result in unexpected behavior in client-side applications relying on these logs.
Credit: security-advisories@github.com security-advisories@github.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| pip/vyper | <=0.3.10 |
Never miss a vulnerability like this again
Sign up to SecAlerts for real-time vulnerability data matched to your software, aggregated from hundreds of sources.
Reference Links
- agent/weakness
- agent/title
- agent/first-publish-date
- agent/type
- agent/severity
- collector/github-advisory-latest
- source/GitHub
- alias/GHSA-xchq-w5r3-4wg3
- alias/CVE-2024-32645
- agent/software-canonical-lookup
- agent/references
- agent/softwarecombine
- agent/event
- agent/author
- agent/tags
- collector/nvd-api
- source/NVD
- agent/last-modified-date
- collector/epss-latest
- source/FIRST
- agent/epss
- collector/mitre-cve
- source/MITRE
- agent/description
- collector/nvd-cve
- collector/github-advisory
- package-manager/pip