#VU65663 Out-of-bounds write in grpc - CVE-2017-7861

Vulnerability identifier: #VU65663

Vulnerability risk: High

CVSSv4.0: 7.2 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2017-7861

CWE-ID: CWE-787

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
grpc
Server applications / Frameworks for developing and running applications

Vendor: Google

Description

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to a boundary error in gpr_free() function in core/lib/support/alloc.c. A remote attacker can send a specially crafted file, trigger out-of-bounds write and execute arbitrary code on the target system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

grpc: 1.0.0 - 1.1.2

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External links
https://www.securityfocus.com/bid/97694
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=655
https://github.com/grpc/grpc/pull/9833

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.