Out-of-bounds read in firefox-esr (Alpine package)

1) Out-of-bounds read

EUVDB-ID: #VU18011

Risk: Medium

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

CVE-ID: CVE-2018-20176

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

Exploit availability: No

Description

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

The vulnerability exists due to a boundary condition when processing RDP packets in sec_parse_crypt_info() and sec_recv() functionsin secure.cfile. A remote attacker can trick the victim that is using the vulnerable RDP client to connect to malicious RDP server, trigger out-of-bounds read error and perform denial of service attack.

Mitigation

Install update from vendor's website.

Vulnerable software versions

firefox-esr (Alpine package): 68.3.0-r0 - 68.8.0-r0

CPE2.3

• cpe:2.3:o:alpine:firefox-esr_alpine_package:68.3.0-r0:*:*:*:*:alpine_linux:*:3.11
• cpe:2.3:o:alpine:firefox-esr_alpine_package:68.4.1-r0:*:*:*:*:alpine_linux:*:3.11
• cpe:2.3:o:alpine:firefox-esr_alpine_package:68.4.2-r0:*:*:*:*:alpine_linux:*:3.11

External links

https://git.alpinelinux.org/aports/commit/?id=d674ed89f91ccc24468e27d5dcde264eb734f58c

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.