ts-asn1-der is a collection of utility classes to encode ASN.1 data following DER rule. Incorrect number DER encoding can lead to denial on service for absolute values in the range 2**31 -- 2**32 - 1. The arithmetic in the numBitLen didn't take into account that values in this range could result in a negative result upon applying the >> operator, leading to an infinite loop. The issue is patched in version 1.0.4. If upgrading is not an option, the issue can be mitigated by validating inputs to Asn1Integer to ensure that they are not smaller than -2**31 + 1 and no larger than 2**31 - 1.

Affected: npm: @apeleghq/asn1-der

### Impact

Incorrect `number` DER encoding can lead to denial on service for absolute values in the range `2**31` -- `2**32 - 1`. The arithmetic in the `numBitLen` didn't take into account that values in this range could result in a negative result upon applying the `>>` operator, leading to an infinite loop.

In addition, `number` encoding had a few other issues that resulted it in it not encoding values correctly.

### Patches

The issue is patched in version `1.0.4`. Users are recommended to upgrade as soon as possible.

### Workarounds

If upgrading is not an option, the issue can be mitigated by validating inputs to `Asn1Integer` to ensure that they are not smaller than `-2**31 + 1` and no larger than `2**31 - 1`. Although `Asn1Integer` supports `bigint` inputs, some additional implementation issues make using `bigint` as a mitigation inviable, as it will result in incorrect values.

If upgrading is not an option and range checks are impractical or undesirable, input to `Asn1Integer` can be provided as a buffer to be used directly. Note that this requires computing the correct DER encoding externally.

### References

N/A