ID CVE-2017-16852
Summary shibsp/metadata/DynamicMetadataProvider.cpp in the Dynamic MetadataProvider plugin in Shibboleth Service Provider before 2.6.1 fails to properly configure itself with the MetadataFilter plugins and does not perform critical security checks such as signature verification, enforcement of validity periods, and other checks specific to deployments, aka SSPCPP-763.
References
Vulnerable Configurations
  • Debian Linux 8.0 (Jessie)
    cpe:2.3:o:debian:debian_linux:8.0
  • Debian Linux 9.0
    cpe:2.3:o:debian:debian_linux:9.0
CVSS
Base: 6.8
Impact:
Exploitability:
CWE CWE-347
CAPEC
  • Padding Oracle Crypto Attack
    An attacker is able to efficiently decrypt data without knowing the decryption key if a target system leaks data on whether or not a padding error happened while decrypting the ciphertext. A target system that leaks this type of information becomes the padding oracle and an attacker is able to make use of that oracle to efficiently decrypt data without knowing the decryption key by issuing on average 128*b calls to the padding oracle (where b is the number of bytes in the ciphertext block). In addition to performing decryption, an attacker is also able to produce valid ciphertexts (i.e., perform encryption) by using the padding oracle, all without knowing the encryption key. Any cryptosystem can be vulnerable to padding oracle attacks if the encrypted messages are not authenticated to ensure their validity prior to decryption, and then the information about padding error is leaked to the attacker. This attack technique may be used, for instance, to break CAPTCHA systems or decrypt/modify state information stored in client side objects (e.g., hidden fields or cookies). This attack technique is a side-channel attack on the cryptosystem that uses a data leak from an improperly implemented decryption routine to completely subvert the cryptosystem. The one bit of information that tells the attacker whether a padding error during decryption has occurred, in whatever form it comes, is sufficient for the attacker to break the cryptosystem. That bit of information can come in a form of an explicit error message about a padding error, a returned blank page, or even the server taking longer to respond (a timing attack). This attack can be launched cross domain where an attacker is able to use cross-domain information leaks to get the bits of information from the padding oracle from a target system / service with which the victim is communicating. To do so an attacker sends a request containing ciphertext to the target system. Due to the browser's same origin policy, the attacker is not able to see the response directly, but can use cross-domain information leak techniques to still get the information needed (i.e., information on whether or not a padding error has occurred). For instance, this can be done using "img" tag plus the onerror()/onload() events. The attacker's JavaScript can make web browsers to load an image on the target site, and know if the image is loaded or not. This is 1-bit information needed for the padding oracle attack to work: if the image is loaded, then it is valid padding, otherwise it is not.
nessus via4
  • NASL family SuSE Local Security Checks
    NASL id SUSE_SU-2017-3215-1.NASL
    description This update for shibboleth-sp fixes the following issues: Security issue fixed : - CVE-2017-16852: Fix critical security checks in the Dynamic MetadataProvider plugin in Shibboleth Service (bsc#1068689). Note that Tenable Network Security has extracted the preceding description block directly from the SUSE security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.
    last seen 2018-09-02
    modified 2018-08-01
    plugin id 105036
    published 2017-12-06
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=105036
    title SUSE SLES12 Security Update : shibboleth-sp (SUSE-SU-2017:3215-1)
  • NASL family Debian Local Security Checks
    NASL id DEBIAN_DSA-4038.NASL
    description Rod Widdowson of Steading System Software LLP discovered a coding error in the 'Dynamic' metadata plugin of the Shibboleth Service Provider, causing the plugin to fail configuring itself with the filters provided and omitting whatever checks they are intended to perform. See https://shibboleth.net/community/advisories/secadv_20171115.txt for details.
    last seen 2018-09-01
    modified 2018-01-29
    plugin id 104644
    published 2017-11-17
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=104644
    title Debian DSA-4038-1 : shibboleth-sp2 - security update
  • NASL family Debian Local Security Checks
    NASL id DEBIAN_DLA-1179.NASL
    description Rod Widdowson of Steading System Software LLP discovered a coding error in the 'Dynamic' metadata plugin of the Shibboleth Service Provider, causing the plugin to fail configuring itself with the filters provided and omitting whatever checks they are intended to perform. For Debian 7 'Wheezy', these problems have been fixed in version 2.4.3+dfsg-5+deb7u2. We recommend that you upgrade your shibboleth-sp2 packages. NOTE: Tenable Network Security has extracted the preceding description block directly from the DLA security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.
    last seen 2018-09-01
    modified 2018-07-06
    plugin id 104682
    published 2017-11-20
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=104682
    title Debian DLA-1179-1 : shibboleth-sp2 security update
  • NASL family SuSE Local Security Checks
    NASL id OPENSUSE-2017-1348.NASL
    description This update for shibboleth-sp fixes the following issues : Security issue fixed : - CVE-2017-16852: Fix critical security checks in the Dynamic MetadataProvider plugin in Shibboleth Service (bsc#1068689). This update was imported from the SUSE:SLE-12-SP1:Update update project.
    last seen 2018-09-02
    modified 2018-01-26
    plugin id 105234
    published 2017-12-14
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=105234
    title openSUSE Security Update : shibboleth-sp (openSUSE-2017-1348)
refmap via4
confirm
debian DSA-4038
mlist [debian-lts-announce] 20171118 [SECURITY] [DLA 1179-1] shibboleth-sp2 security update
Last major update 16-11-2017 - 12:29
Published 16-11-2017 - 12:29
Last modified 03-02-2018 - 21:29
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