Heap out-of-bounds read in curl (Alpine package)

1) Heap out-of-bounds read

EUVDB-ID: #VU17458

Risk: Low

CVSSv3.1: 5.9 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L/E:P/RL:O/RC:C]

CVE-ID: CVE-2019-3823

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

Exploit availability: No

Description

The vulnerability allows a remote attacker to gain access to potentially sensitive information or cause the service to crash.

The vulnerability exists due to a heap out-of-bounds read in the code handling the end-of-response for SMTP. If the buffer passed to `smtp_endofresp()` isn't NUL terminated and contains no character ending the parsed number, and `len` is set to 5, then the `strtol()` call reads beyond the allocated buffer. A remote attacker can trigger heap out-of-bounds read error and read contents of memory on the system or cause the service to crash..

Mitigation

Install update from vendor's website.

Vulnerable software versions

curl (Alpine package): 7.61.1-r1

CPE2.3

• cpe:2.3:o:alpine:curl_alpine_package:7.61.1-r1:*:*:*:*:alpine_linux:*:

External links

http://git.alpinelinux.org/aports/commit/?id=5ba18f0ca5e2e4f2371cf806a531c993d2b9689b
http://git.alpinelinux.org/aports/commit/?id=d3a946561011a260c6b7a31fa0714a943e38cdfa
http://git.alpinelinux.org/aports/commit/?id=f7cc724b9adaf1c7da74f14c8664294e44e73e99
http://git.alpinelinux.org/aports/commit/?id=9a196002b469339f47b2d93361aced8256aa4dce
http://git.alpinelinux.org/aports/commit/?id=203cb413da1ecf416412c7b7d53213b1c2b22a09

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. However, proof of concept for this vulnerability is available.