CVE-2017-12871 SimpleSAMLphp Incorrect IV generation for encryption

What is CVE-2017-12871?

CVE-2017-12871 is a medium-severity vulnerability in n/a, published on 1 Sep 2017. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

The aesEncrypt method in lib/SimpleSAML/Utils/Crypto.php in SimpleSAMLphp 1.14.x through 1.14.11 makes it easier for context-dependent attackers to bypass the encryption protection mechanism by leveraging use of the first 16 bytes of the secret key as the initialization vector (IV).

Weakness: CWE-326

Which versions are affected by CVE-2017-12871?

2 open source packages ship an affected version, including simplesamlphp/simplesamlphp. It affects 1 product.

Products include Simplesamlphp Simplesamlphp.

How do I fix CVE-2017-12871?

Upgrade simplesamlphp/simplesamlphp to 1.14.12 or later.

Is CVE-2017-12871 being exploited?

There is no known exploitation of CVE-2017-12871 in the wild and no public exploit code.

Other vulnerabilities in n/a

• CVE-2017-12868 SimpleSAMLphp Session fixation issue and authentication bypass in the authcrypt module Critical 9.8
• CVE-2018-7644 SimpleSAMLphp Improper Verification of Cryptographic Signature High 7.5
• CVE-2026-49284 SimpleSAMLphp SP accepts a response from an unexpected IdP when unsigned `Response/InResponseTo` is combined with a signed assertion lacking `SubjectConfirmationData/InResponseTo` High 7.1
• CVE-2018-6520 SimpleSAMLphp Open redirection protection bypass Medium 6.1
• CVE-2017-12870 SimpleSAMLphp Unauthenticated encryption in CBC mode Medium 5.9

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as DEBIAN-CVE-2017-12871, GHSA-ww3w-592j-5qrw, UBUNTU-CVE-2017-12871.