Memory leak in libxml2 (Alpine package)

1) Memory leak

EUVDB-ID: #VU24489

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-2019-19956

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 xmlParseBalancedChunkMemoryRecover in parser.c. A remote attacker can trigger a memory leak related to newDoc->oldNs and perform denial of service attack.

Mitigation

Install update from vendor's website.

Vulnerable software versions

libxml2 (Alpine package): 2.7.3-r0 - 2.9.9-r1

CPE2.3

• cpe:2.3:a:alpine:libxml2_alpine_package:2.7.3-r0:*:*:*:*:alpine_linux:*:1.9
• cpe:2.3:a:alpine:libxml2_alpine_package:2.8.0-r0:*:*:*:*:alpine_linux:*:2.4
• cpe:2.3:a:alpine:libxml2_alpine_package:2.8.0-r1:*:*:*:*:alpine_linux:*:2.4

External links

https://git.alpinelinux.org/aports/commit/?id=4bc223137c3c80eb753c3caaa60b3a368b80af0f
https://git.alpinelinux.org/aports/commit/?id=739b1c4d5cc974a69631d54e887289c9c79dce02
https://git.alpinelinux.org/aports/commit/?id=81df780b6d24c97fe63fde06d2cf77d76dc47bb1

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.