PT-2017-17977 · Apple · Clang+1

Kenton Varda · Published 2017-04-17 · Updated 2017-04-25 · CVE-2017-7892

Positive Technologies (AI Summary)

CVSS v3.1

7.5

High

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Name of the Vulnerable Software and Affected Versions Cap'n Proto versions prior to 0.5.3.1

Description The issue allows remote crashes due 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. For example, the Apple LLVM version 8.1.0 (clang-802.0.41) compiler has optimization that elides a bounds check in such calculations. The attack vector is a crafted far pointer within a message.

Recommendations For versions prior to 0.5.3.1, update to version 0.5.3.1 or later to resolve the issue. As a temporary workaround, consider disabling the optimization in the compiler to prevent the elision of bounds checks until a patch is applied.

Fix

RCE

Weakness Enumeration

CWE-20

Related Identifiers

CVE-2017-7892

Affected Products

Llvm

Clang

References · 8

• https://osv.dev/vulnerability/CVE-2017-7892 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2017-7892 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2017-7892 · Security Note
• https://ubuntu.com/security/CVE-2017-7892 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2017-7892 · Security Note
• https://security-tracker.debian.org/tracker/CVE-2017-7892 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2017-7892 · Vendor Advisory
• https://github.com/sandstorm-io/capnproto/blob/master/security-advisories/2017-04-17-0-apple-clang-elides-bounds-check.md · Note