CVE-2022-24795 Buffer Overflow and Integer Overflow in yajl-ruby

What is CVE-2022-24795?

CVE-2022-24795 is a medium-severity vulnerability in brianmario yajl-ruby, published on 5 Apr 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

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.

Weakness: CWE-190, CWE-122

Which versions are affected by CVE-2022-24795?

2 open source packages ship an affected version, including yajl-ruby. It affects 1 product.

Products include Yajl-Ruby Project Yajl-Ruby.

How do I fix CVE-2022-24795?

Upgrade yajl-ruby to 1.4.3 or later.

Is CVE-2022-24795 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2022-24795 exists.

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as ALSA-2022:7524, ALSA-2022:8252, AZL-10552, AZL-35233, CLSA-2026-1791550583, DEBIAN-CVE-2022-24795 and 12 more.