#git

### Impact the `slice()` builtin can elide side effects when the output length is 0, and the source bytestring is a builtin (`msg.data` or `<address>.code`). the reason is that for these source locations, the check that `length >= 1` is skipped: https://github.com/vyperlang/vyper/blob/68b68c4b30c5ef2f312b4674676170b8a6eaa316/vyper/builtins/functions.py#L315-L319 the result is that a 0-length bytestring constructed with slice can be passed to `make_byte_array_copier`, which elides evaluation of its source argument when the max length is 0: https://github.com/vyperlang/vyper/blob/68b68c4b30c5ef2f312b4674676170b8a6eaa316/vyper/codegen/core.py#L189-L191 the impact is that side effects in the `start` argument may be elided when the `length` argument is 0, e.g. `slice(msg.data, self.do_side_effect(), 0)`. the following example illustrates how the issue would look in user code ```vyper counter: public(uint256) @external def test() -> Bytes[10]: b: Bytes[10] = slice(msg.data, self.side...

### Summary When Tornado's ``multipart/form-data`` parser encounters certain errors, it logs a warning but continues trying to parse the remainder of the data. This allows remote attackers to generate an extremely high volume of logs, constituting a DoS attack. This DoS is compounded by the fact that the logging subsystem is synchronous. ### Affected versions All versions of Tornado prior to 6.5.0 are affected. The vulnerable parser is enabled by default. ### Solution Upgrade to Tornado version 6.5. In the meantime, risk can be mitigated by blocking `Content-Type: multipart/form-data` in a proxy.

### Impact `concat()` may skip evaluation of side effects when the length of an argument is zero. this is due to a fastpath in the implementation which skips evaluation of argument expressions when their length is zero: https://github.com/vyperlang/vyper/blob/68b68c4b30c5ef2f312b4674676170b8a6eaa316/vyper/builtins/functions.py#L560-L562 in practice, it would be very unusual in user code to construct zero-length bytestrings using an expression with side-effects, since zero-length bytestrings are typically constructed with the empty literal `b""`; the only way to construct an empty bytestring which has side effects would be with the ternary operator introduced in v0.3.8, e.g. `b"" if self.do_some_side_effect() else b""`. the following example demonstrates how the issue would look in user code ```vyper counter: public(uint256) @external def test() -> Bytes[256]: a: Bytes[256] = concat(b"" if self.sideeffect() else b"", b"aaaa") return a def sideeffect() -> bool: self.count...

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Mattermost versions 10.5.x <= 10.5.2, 9.11.x <= 9.11.11 failed to properly verify a user's permissions when accessing groups, which allows an attacker to view group information via an API request.

Mattermost versions 10.5.x <= 10.5.2, 9.11.x <= 9.11.11 fail to check `RestrictSystemAdmin` setting if user doesn't have access to `ExperimentalSettings` which allows a System Manager to access `ExperimentSettings` when `RestrictSystemAdmin` is true via System Console.

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### Summary Using tcp breaks blocking and allows DNS exfiltration. ### PoC ``` name: test on: push: branches: - "*" jobs: testBullFrog: runs-on: ubuntu-22.04 steps: - name: Use google dns run: | sudo resolvectl dns eth0 1.1.1.1 resolvectl status - name: Set up bullfrog to block everything uses: bullfrogsec/bullfrog@1472c28724ef13ea0adc54d0a42c2853d42786b1 # v0.8.2 with: egress-policy: block allowed-domains: | *.github.com - name: Test connectivity run: | echo testing udp allowed .. dig api.github.com @1.1.1.1 || : echo testing tcp allowed .. dig api.github.com @1.1.1.1 +tcp || : echo testing udp not allowed dig api.google.com @1.1.1.1 || : echo testing tcp not allowed dig api.google.com @1.1.1.1 +tcp || : ``` ### Impact sandbox bypass ![image](https://github.com/user-attach...