QID 355555

Yajl-ruby is a c binding to the yajl json parsing and generation library.
The 1.x branch and the 2.x branch of `yajl` contain an integer overflow which leads to subsequent heap memory corruption when dealing with large (~2gb) inputs.
The reallocation logic at `yajl_buf.c#l64` may result in the `need` 32bit integer wrapping to 0 when `need` approaches a value of 0x80000000 (i.e. ~2gb of data), which results in a reallocation of buf->alloc into a small heap chunk.
These integers are declared as `size_t` in the 2.x branch of `yajl`, which practically prevents the issue from triggering on 64bit platforms, however this does not preclude this issue triggering on 32bit builds on which `size_t` is a 32bit integer.
Subsequent population of this under-allocated heap chunk is based on the original buffer size, leading to heap memory corruption.
This vulnerability mostly impacts process availability.
Maintainers believe exploitation for arbitrary code execution is unlikely.
A patch is available and anticipated to be part of yajl-ruby version 1.4.2.
As a workaround, avoid passing large inputs to yajl. (
( CVE-2022-24795)

Successful exploitation of this vulnerability could lead to a securitybreach or could affect integrity, availability, and confidentiality.