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CVE-2017-7892

Published: 17 April 2017

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.

From the Ubuntu Security Team

Kenton Varda discovered that the Cap'n Proto utility has a buffer overflow vulnerability. An attacker could use this vulnerability to cause a crash or possibly execute arbitrary code.

Notes

AuthorNote
ratliff
Advisory: "Some bounds checks are elided by Apple's compiler and possibly others, leading to a possible attack especially in 32-bit builds."
Setting status to needs-triage to investigate whether it impacts Ubuntu

Priority

Low

Cvss 3 Severity Score

7.5

Score breakdown

Status

Package Release Status
capnproto
Launchpad, Ubuntu, Debian
artful Ignored
(end of life)
bionic
Released (0.6.1-1)
precise Does not exist

trusty
Released (0.4.0-1ubuntu2.1)
upstream
Released (0.5.3.1)
xenial
Released (0.5.3-2ubuntu1.1)
yakkety Ignored
(end of life)
zesty Ignored
(end of life)

Severity score breakdown

Parameter Value
Base score 7.5
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Scope Unchanged
Confidentiality None
Integrity impact None
Availability impact High
Vector CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H