Buffer Overflow in yajl-ruby
CVE-2022-24795 · GHSA-jj47-x69x-mxrm
- Affected
- RubyGems yajl-ruby <= 1.4.2
- Fixed in
- 1.4.3· Vendor fix available
- Issue
- 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 contain an integer overflow which leads to subsequent heap memory corruption when dealing with large (~2GB) inputs. Details The reallocation logic at yajlbuf.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 sizet 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 sizet 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…
Recommended action: Upgrade to 1.4.3 or later, then redeploy and verify.A vendor fix does not resolve your finding until you verify it in your own systems.