CVE-2022-46149

Cap’n Proto is a data interchange format and remote procedure call (RPC)
system. Cap’n Proro prior to versions 0.7.1, 0.8.1, 0.9.2, and 0.10.3, as
well as versions of Cap’n Proto’s Rust implementation prior to 0.13.7,
0.14.11, and 0.15.2 are vulnerable to out-of-bounds read due to logic error
handling list-of-list. This issue may lead someone to remotely segfault a
peer by sending it a malicious message, if the victim performs certain
actions on a list-of-pointer type. Exfiltration of memory is possible if
the victim performs additional certain actions on a list-of-pointer type.
To be vulnerable, an application must perform a specific sequence of
actions, described in the GitHub Security Advisory. The bug is present in
inlined code, therefore the fix will require rebuilding dependent
applications. Cap’n Proto has C++ fixes available in versions 0.7.1, 0.8.1,
0.9.2, and 0.10.3. The capnp Rust crate has fixes available in versions
0.13.7, 0.14.11, and 0.15.2.

Notes