NULL pointer dereference in openssl (Alpine package)

1) NULL pointer dereference

EUVDB-ID: #VU11534

Risk: Medium

CVSSv4.0: 4.6 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2014-0198

CWE-ID: CWE-476 - NULL Pointer Dereference

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to a NULL pointer dereference error in the in the do_ssl3_write() function in OpenSSL. A remote attacker can send a specially crafted request to vulnerable application and trigger denial of service attack.

Successful exploitation of the vulnerability requires that SSL_MODE_RELEASE_BUFFERS is enabled.

Mitigation

Install update from vendor's website.

Vulnerable software versions

openssl (Alpine package): 1.0.0c-r0 - 1.0.1b-r0

CPE2.3

• cpe:2.3:o:alpine:openssl_alpine_package:1.0.0c-r0:*:*:*:*:alpine_linux:*:2.0
• cpe:2.3:o:alpine:openssl_alpine_package:1.0.0f-r0:*:*:*:*:alpine_linux:*:2.1
• cpe:2.3:o:alpine:openssl_alpine_package:1.0.0k-r0:*:*:*:*:alpine_linux:*:2.2

External links

https://git.alpinelinux.org/aports/commit/?id=c7c8818b7203c5ff58dd5f7d03f7e47cb681348d
https://git.alpinelinux.org/aports/commit/?id=ac8ec244eb5c39536570aaa2ada3a5695ef6e773
https://git.alpinelinux.org/aports/commit/?id=089bdcf0042be951c8af56aafe9a2b6a30e50feb
https://git.alpinelinux.org/aports/commit/?id=d0064f3f832a9d56c6002a3d397bf7e03457ecec

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.