Vulnerability CVE-2017-7892

Vulnerability Name:

CVE-2017-7892 (CCN-125830)

Assigned:

2017-04-17

Published:

2017-04-17

Updated:

2017-04-25

Summary:

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.

CVSS v3 Severity:

7.5 High (CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
6.5 Medium (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C)

Exploitability Metrics:	Attack Vector (AV): Network Attack Complexity (AC): Low Privileges Required (PR): None User Interaction (UI): None
Scope:	Scope (S): Unchanged
Impact Metrics:	Confidentiality (C): None Integrity (I): None Availibility (A): High

7.5 High (CCN CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
6.5 Medium (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C)

Exploitability Metrics:	Attack Vector (AV): Network Attack Complexity (AC): Low Privileges Required (PR): None User Interaction (UI): None
Scope:	Scope (S): Unchanged
Impact Metrics:	Confidentiality (C): None Integrity (I): None Availibility (A): High

CVSS v2 Severity:

5.0 Medium (CVSS v2 Vector: AV:N/AC:L/Au:N/C:N/I:N/A:P)

Exploitability Metrics:	Access Vector (AV): Network Access Complexity (AC): Low Authentication (Au): None
Impact Metrics:	Confidentiality (C): None Integrity (I): None Availibility (A): Partial

7.8 High (CCN CVSS v2 Vector: AV:N/AC:L/Au:N/C:N/I:N/A:C)

Exploitability Metrics:	Access Vector (AV): Network Access Complexity (AC): Low Athentication (Au): None
Impact Metrics:	Confidentiality (C): None Integrity (I): None Availibility (A): Complete

Vulnerability Type:

CWE-20

Vulnerability Consequences:

Denial of Service

References:

Source: MITRE
Type: CNA
CVE-2017-7892

Source: XF
Type: UNKNOWN
sandstorm-capnproto-cve20177892-dos(125830)

Source: CCN
Type: capnproto GIT Repository
capnproto

Source: CONFIRM
Type: Third Party Advisory
https://github.com/sandstorm-io/capnproto/blob/master/security-advisories/2017-04-17-0-apple-clang-elides-bounds-check.md

Vulnerable Configuration:

Configuration 1:

cpe:/a:capnproto:capnproto:*:*:*:*:*:*:*:* (Version <= 0.5.3)

Denotes that component is vulnerable

Oval Definitions

Definition ID	Class	Title	Last Modified
oval:com.ubuntu.artful:def:20177892000	V	CVE-2017-7892 on Ubuntu 17.10 (artful) - low.	2017-04-17
oval:com.ubuntu.bionic:def:201778920000000	V	CVE-2017-7892 on Ubuntu 18.04 LTS (bionic) - low.	2017-04-17
oval:com.ubuntu.bionic:def:20177892000	V	CVE-2017-7892 on Ubuntu 18.04 LTS (bionic) - low.	2017-04-17
oval:com.ubuntu.xenial:def:201778920000000	V	CVE-2017-7892 on Ubuntu 16.04 LTS (xenial) - low.	2017-04-17
oval:com.ubuntu.trusty:def:20177892000	V	CVE-2017-7892 on Ubuntu 14.04 LTS (trusty) - low.	2017-04-17
oval:com.ubuntu.xenial:def:20177892000	V	CVE-2017-7892 on Ubuntu 16.04 LTS (xenial) - low.	2017-04-17

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