Out-of-bounds read in curl (Alpine package)

1) Out-of-bounds read

EUVDB-ID: #VU32182

Risk: High

CVSSv3.1: 8.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2016-9953

CWE-ID: CWE-125 - Out-of-bounds read

Exploit availability: No

Description

The vulnerability allows a remote non-authenticated attacker to execute arbitrary code.

The verify_certificate function in lib/vtls/schannel.c in libcurl 7.30.0 through 7.51.0, when built for Windows CE using the schannel TLS backend, allows remote attackers to obtain sensitive information, cause a denial of service (crash), or possibly have unspecified other impact via a wildcard certificate name, which triggers an out-of-bounds read.

Mitigation

Install update from vendor's website.

Vulnerable software versions

curl (Alpine package): 7.30.0-r0 - 7.52.0-r0

CPE2.3

• cpe:2.3:o:alpine:curl_alpine_package:7.30.0-r0:*:*:*:*:alpine_linux:*:
• cpe:2.3:o:alpine:curl_alpine_package:7.52.0-r0:*:*:*:*:alpine_linux:*:
• cpe:2.3:o:alpine:curl_alpine_package:7.51.0-r0:*:*:*:*:alpine_linux:*:

External links

http://git.alpinelinux.org/aports/commit/?id=7079fe21530ae1c8147925d8b591131b786ab2e9
http://git.alpinelinux.org/aports/commit/?id=619d9f8608068fab555a9a54e6154eb798eb5c2c
http://git.alpinelinux.org/aports/commit/?id=09397ff9b9dd0d5668c3eac94b18bf725cc0cb0d
http://git.alpinelinux.org/aports/commit/?id=8a5e3005b1e698bb2e3052f1ed638086620775f7
http://git.alpinelinux.org/aports/commit/?id=3aa892ac421bfd2d826eae84932f3edcbfade015

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.