Memory corruption in strongswan (Alpine package)

1) Memory corruption

EUVDB-ID: #VU13125

Risk: Low

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:Clear]

CVE-ID: CVE-2018-10811

CWE-ID: CWE-119 - Memory corruption

Exploit availability: No

Description

The vulnerability allows a remote attacker to cause DoS condition on the target system.

The vulnerability exists in the Internet Key Exchange Version 2 (IKEv2) key derivation of strongSwan due to insufficient initialization of the variable that stores the SKEYSEED for IKEv2 key derivation before using the negotiated pseudorandom function (PRF). A remote attacker can trigger a key derivation failure and cause the affected software to clear the uninitialized memory that may lead to crash.

Mitigation

Install update from vendor's website.

Vulnerable software versions

strongswan (Alpine package): 5.1.3-r0 - 5.6.3-r2

strongswan (Alpine package):

CPE2.3

• cpe:2.3:o:alpine:strongswan_alpine_package:5.1.3-r0:*:*:*:*:alpine_linux:*:2.6
• cpe:2.3:o:alpine:strongswan_alpine_package:5.1.3-r1:*:*:*:*:alpine_linux:*:2.7
• cpe:2.3:o:alpine:strongswan_alpine_package:5.2.2-r0:*:*:*:*:alpine_linux:*:3.1
• cpe:2.3:o:alpine:strongswan_alpine_package::*:*:*:*:alpine_linux:*:*

External links

https://git.alpinelinux.org/aports/commit/?id=142cd0660c759d91ccdd0b6b6fd5f4959413ed93
https://git.alpinelinux.org/aports/commit/?id=69cb3c4ebb573f4427b512a8f3ce9f8da6edc356
https://git.alpinelinux.org/aports/commit/?id=f48354faeaa48613ec150ba912a378e92d8fd969

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.