| Name | CVE-2017-7892 |
| Description | Sandstorm Cap'n Proto before 0.5.3.1 allows remote crashes related to a compiler optimization. A remote attacker can trigger a segfault in a 32-bit libcapnp application because Cap'n Proto relies on pointer arithmetic calculations that overflow. An example compiler with optimization that elides a bounds check in such calculations is Apple LLVM version 8.1.0 (clang-802.0.41). The attack vector is a crafted far pointer within a message. |
| Source | CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
| Debian Bugs | 860960 |
Vulnerable and fixed packages
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|
| capnproto (PTS) | stretch | 0.5.3-2 | vulnerable |
| buster | 0.7.0-3 | fixed |
| bullseye | 0.7.0-7 | fixed |
| bookworm | 0.9.2-2 | fixed |
| sid, trixie | 1.0.1-4 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|
| capnproto | source | (unstable) | 0.6.1-1 | unimportant | | 860960 |
Notes
https://github.com/sandstorm-io/capnproto/blob/master/security-advisories/2017-04-17-0-apple-clang-elides-bounds-check.md
Fixed by: https://github.com/sandstorm-io/capnproto/commit/52bc956459a5e83d7c31be95763ff6399e064ae4
So far only Apple's compiler has been shown to apply the problematic optimization, fixed in 0.5.3.1 upstream