Use-after-free error in curl (Alpine package)

1) Use-after-free error

EUVDB-ID: #VU15672

Risk: Low

CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2018-16840

CWE-ID: CWE-416 - Use After Free

Exploit availability: No

Description

The vulnerability allows a remote attacker to cause DoS condition on the target system.

The vulnerability exists due to use-after-free error in closing an easy handle in the 'Curl_close()' function. A remote unauthenticated attacker can specially crafted data, trigger memory corruption and cause the service to crash.

Mitigation

Install update from vendor's website.

Vulnerable software versions

curl (Alpine package): 7.61.1-r0 - 7.61.1-r3

curl (Alpine package):

CPE2.3

• cpe:2.3:a:alpine:curl_alpine_package:7.61.1-r0:*:*:*:*:alpine_linux:*:3.4
• cpe:2.3:a:alpine:curl_alpine_package:7.61.1-r3:*:*:*:*:alpine_linux:*:3.8
• cpe:2.3:a:alpine:curl_alpine_package::*:*:*:*:alpine_linux:*:*

External links

https://git.alpinelinux.org/aports/commit/?id=9a196002b469339f47b2d93361aced8256aa4dce
https://git.alpinelinux.org/aports/commit/?id=8cf4c8d1fc7898a590a8df46d139785baba40576
https://git.alpinelinux.org/aports/commit/?id=45a890319c9dae0764956a1cde0508ea76d5a6d4
https://git.alpinelinux.org/aports/commit/?id=73c7cfb12e9bf26f050b7ad2b5975c7b8c737f76
https://git.alpinelinux.org/aports/commit/?id=d84961d2c2bf448d72bbe0cbcc3d08d37bb88dab
https://git.alpinelinux.org/aports/commit/?id=e18d21d9de556e0b240ee9927d91fce46d8e31ba
https://git.alpinelinux.org/aports/commit/?id=8776c8cc044196f8f87d6fbc51e38dfa0f5aa438

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.