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CVE-2020-26235 — Segmentation fault in Rust time crate

Affected: time-rs time

In Rust time crate from version 0.2.7 and before version 0.2.23, unix-like operating systems may segfault due to dereferencing a dangling pointer in specific circumstances. This requires the user to set any environment variable in a different thread than the affected functions. The affected functions are time::UtcOffset::local_offset_at, time::UtcOffset::try_local_offset_at, time::UtcOffset::current_local_offset, time::UtcOffset::try_current_local_offset, time::OffsetDateTime::now_local and time::OffsetDateTime::try_now_local. Non-Unix targets are unaffected. This includes Windows and wasm. The issue was introduced in version 0.2.7 and fixed in version 0.2.23.

GHSA-wcg3-cvx6-7396 — Segmentation fault in time

Affected: crates.io: time

### Impact

Unix-like operating systems may segfault due to dereferencing a dangling pointer in specific circumstances. This requires an environment variable to be set in a different thread than the affected functions. This may occur without the user's knowledge, notably in a third-party library.

The affected functions from time 0.2.7 through 0.2.22 are:

- `time::UtcOffset::local_offset_at` - `time::UtcOffset::try_local_offset_at` - `time::UtcOffset::current_local_offset` - `time::UtcOffset::try_current_local_offset` - `time::OffsetDateTime::now_local` - `time::OffsetDateTime::try_now_local`

The affected functions in time 0.1 (all versions) are:

- `at` - `at_utc` - `now`

Non-Unix targets (including Windows and wasm) are unaffected.

### Patches

In some versions of `time`, the internal method that determines the local offset has been modified to always return `None` on the affected operating systems. This has the effect of returning an `Err` on the `try_*` methods and `UTC` on the non-`try_*` methods. In later versions, `time` will attempt to determine the number of threads running in the process. If the process is single-threaded, the call will proceed as its safety invariant is upheld.

Users and library authors with time in their dependency tree must perform `cargo update`, which will pull in the updated, unaffected code.

Users of time 0.1 do not have a patch and must upgrade to an unaffected version: time 0.2.23 or greater or the 0.3 series.

### Workarounds

Libra…

RUSTSEC-2020-0159 — Potential segfault in `localtime_r` invocations

Affected: crates.io: chrono

### Impact

### Workarounds

No workarounds are known.

### References

- [time-rs/time#293](https://github.com/time-rs/time/issues/293)