Debian update for strongswan



| Updated: 2018-11-05
Risk Medium
Patch available YES
Number of vulnerabilities 2
CVE-ID CVE-2018-17540
CVE-2018-16151
CWE-ID CWE-119
CWE-287
Exploitation vector Network
Public exploit N/A
Vulnerable software
 strongswan (Debian package)
Operating systems & Components / Operating system package or component

Vendor Debian

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) Buffer overflow

EUVDB-ID: #VU15165

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-2018-17540

CWE-ID: CWE-119 - Memory corruption

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform denial of service attacks.

The vulnerability exists due to a boundary error when processing certificates within gmp plugin. A remote attacker can create a specially crafted certificate, pass it to the affected application and trigger application crash.

Mitigation

Update the affected package to version: 5.5.1-4+deb9u4.

Vulnerable software versions

strongswan (Debian package): 5.5.0-1 - 5.5.1-4

CPE2.3 External links

https://www.debian.org/security/2018/dsa-4309


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.

2) Improper Authentication

EUVDB-ID: #VU15722

Risk: Medium

CVSSv4.0: 1.7 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2018-16151

CWE-ID: CWE-287 - Improper Authentication

Exploit availability: No

Description

The vulnerability allows a remote attacker to bypass authentication process.

The vulnerability exists due to an error in RSA implementation based on GMP (verify_emsa_pkcs1_signature() in gmp_rsa_public_key.c) within the gmp plugin that does not reject excess data after the encoded algorithm OID during PKCS#1 v1.5 signature verification. A remote attacker can forge signatures when small public exponents are being used and impersonate the victim.

Successful exploitation of the vulnerability may allow an attacker to take full control over victim's session but requires that only an RSA signature is used for IKEv2 authentication.

Mitigation

Update the affected package to version: 5.5.1-4+deb9u4.

Vulnerable software versions

strongswan (Debian package): 5.5.0-1 - 5.5.1-4

CPE2.3 External links

https://www.debian.org/security/2018/dsa-4309


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.



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