Amazon Linux AMI update for nss

1) Heap-based buffer overflow

EUVDB-ID: #VU58477

Risk: High

CVSSv3.1: 8.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-43527

CWE-ID: CWE-122 - Heap-based Buffer Overflow

Exploit availability: No

Description

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to a boundary error when handling DER-encoded DSA or RSA-PSS signatures. A remote attacker can send specially crafted signatures encoded within CMS, S/MIME, PKCS #7, or PKCS #12 to the application, trigger heap-based buffer overflow and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Mitigation

Update the affected packages:

i686:
    nss-sysinit-3.53.1-7.87.amzn1.i686
    nss-devel-3.53.1-7.87.amzn1.i686
    nss-pkcs11-devel-3.53.1-7.87.amzn1.i686
    nss-tools-3.53.1-7.87.amzn1.i686
    nss-debuginfo-3.53.1-7.87.amzn1.i686
    nss-3.53.1-7.87.amzn1.i686

src:
    nss-3.53.1-7.87.amzn1.src

x86_64:
    nss-pkcs11-devel-3.53.1-7.87.amzn1.x86_64
    nss-debuginfo-3.53.1-7.87.amzn1.x86_64
    nss-tools-3.53.1-7.87.amzn1.x86_64
    nss-devel-3.53.1-7.87.amzn1.x86_64
    nss-sysinit-3.53.1-7.87.amzn1.x86_64
    nss-3.53.1-7.87.amzn1.x86_64

Vulnerable software versions

Amazon Linux AMI: All versions

External links

http://alas.aws.amazon.com/ALAS-2021-1552.html

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.