Memory leak in libxml2 (Alpine package)

1) Memory leak

EUVDB-ID: #VU24487

Risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2019-20388

CWE-ID: CWE-401 - Missing release of memory after effective lifetime

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform DoS attack on the target system.

The vulnerability exists due memory leak in xmlSchemaPreRun in xmlschemas.c. A remote attacker can trigger a xmlSchemaValidateStream memory leak and perform denial of service attack.

Mitigation

Install update from vendor's website.

Vulnerable software versions

libxml2 (Alpine package): 2.9.1-r0 - 2.9.10-r2

CPE2.3

• cpe:2.3:o:alpine:libxml2_alpine_package:2.9.1-r0:*:*:*:*:alpine_linux:*:2.5
• cpe:2.3:o:alpine:libxml2_alpine_package:2.9.1-r1:*:*:*:*:alpine_linux:*:2.5
• cpe:2.3:o:alpine:libxml2_alpine_package:2.9.10-r2:*:*:*:*:alpine_linux:*:3.10

External links

https://git.alpinelinux.org/aports/commit/?id=595722b8fba7e3ab2b70299653c4d4b7b0e822c4
https://git.alpinelinux.org/aports/commit/?id=ac23b3e90113e1e6c771933e31ddfa087e9af9da

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.