GHSA-jj47-x69x-mxrm

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GHSA-jj47-x69x-mxrm

Summary: Buffer Overflow in yajl-ruby

Details: _NOTE: A previous patch, 1.4.2, fixed the heap memory issue, but could still lead to a DoS infinite loop. Please update to version 1.4.3_ The 1.x branch and the 2.x branch of [yajl](https://github.com/lloyd/yajl) contain an integer overflow which leads to subsequent heap memory corruption when dealing with large (~2GB) inputs. ### Details The [reallocation logic at yajl_buf.c#L64](https://github.com/brianmario/yajl-ruby/blob/7168bd79b888900aa94523301126f968a93eb3a6/ext/yajl/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. ### Impact We rate this as a moderate severity vulnerability which mostly impacts process availability as we believe exploitation for arbitrary code execution to be unlikely. ### Patches Patched in yajl-ruby 1.4.3 ### Workarounds Avoid passing large inputs to YAJL ### References https://github.com/brianmario/yajl-ruby/blob/7168bd79b888900aa94523301126f968a93eb3a6/ext/yajl/yajl_buf.c#L64 ### For more information If you have any questions or comments about this advisory: * Open an issue in [yajl-ruby](https://github.com/brianmario/yajl-ruby/issues)

References: https://github.com/brianmario/yajl-ruby/security/advisories/GHSA-jj47-x69x-mxrm, https://nvd.nist.gov/vuln/detail/CVE-2022-24795, https://github.com/brianmario/yajl-ruby/commit/7168bd79b888900aa94523301126f968a93eb3a6, https://github.com/brianmario/yajl-ruby, https://github.com/brianmario/yajl-ruby/blob/7168bd79b888900aa94523301126f968a93eb3a6/ext/yajl/yajl_buf.c#L64, https://github.com/rubysec/ruby-advisory-db/blob/master/gems/yajl-ruby/CVE-2022-24795.yml, https://lists.debian.org/debian-lts-announce/2023/07/msg00013.html, https://lists.debian.org/debian-lts-announce/2023/08/msg00003.html, https://lists.fedoraproject.org/archives/list/[email protected]/message/KLE3C4CECEJ4EUYI56KXI6OWACWXX7WN, https://lists.fedoraproject.org/archives/list/[email protected]/message/YO32YDJ74DADC7CMJNLSLBVWN5EXGF5J