CVE-2017-7892

Publication date 17 April 2017

Last updated 24 July 2024

Ubuntu priority

Cvss 3 Severity Score

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.

Read the notes from the security team

Status

Show unmaintained releases

Package	Ubuntu Release	Status
capnproto	18.04 LTS bionic	Fixed 0.6.1-1
	17.10 artful	Ignored end of life
	17.04 zesty	Ignored end of life
	16.10 yakkety	Ignored end of life
	16.04 LTS xenial	Fixed 0.5.3-2ubuntu1.1
	14.04 LTS trusty	Fixed 0.4.0-1ubuntu2.1
	12.04 LTS precise	Not in release

Notes

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

Severity score breakdown

Parameter	Value
Base score	7.5 · High
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