CVE-2022-24795

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.

Bugs

• <https://github.com/lloyd/yajl/issues/239&gt;

Notes