Integer overflow in squid (Alpine package)

1) Integer overflow

EUVDB-ID: #VU27666

Risk: High

CVSSv4.0: 6.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2020-11945

CWE-ID: CWE-190 - Integer overflow

Exploit availability: No

Description

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

The vulnerability exists due to integer overflow when processing HTTP Digest Authentication tokens, if memory pooling is disabled. A remote attacker can pass a specially crafted authentication nonce and execute arbitrary code on the server through the free'd nonce credentials.

In case memory pooling is enabled, a remote attacker can replay a sniffed Digest Authentication nonce to gain access  to resources that are otherwise forbidden.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Mitigation

Install update from vendor's website.

Vulnerable software versions

squid (Alpine package): 3.2.2-r0 - 4.13-r0

CPE2.3

• cpe:2.3:a:alpine:squid_alpine_package:3.2.2-r0:*:*:*:*:alpine_linux:*:2.3
• cpe:2.3:a:alpine:squid_alpine_package:3.2.8-r0:*:*:*:*:alpine_linux:*:2.4
• cpe:2.3:a:alpine:squid_alpine_package:3.2.9-r0:*:*:*:*:alpine_linux:*:2.3

External links

https://git.alpinelinux.org/aports/commit/?id=823d50238d98c0b70173658a2d33512cc2e63e37
https://git.alpinelinux.org/aports/commit/?id=f4d966b537973146330fd5be1079dc392095617d
https://git.alpinelinux.org/aports/commit/?id=5e6172c90ca3b243a8f1143da08e3c2101764ba5

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

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