ID CVE-2015-7827
Summary Botan before 1.10.13 and 1.11.x before 1.11.22 make it easier for remote attackers to conduct million-message attacks by measuring time differences, related to decoding of PKCS#1 padding.
References
Vulnerable Configurations
  • Fedora 24
    cpe:2.3:o:fedoraproject:fedora:24
  • Botan 1.11.21
    cpe:2.3:a:botan_project:botan:1.11.21
  • Botan 1.11.20
    cpe:2.3:a:botan_project:botan:1.11.20
  • Botan 1.11.19
    cpe:2.3:a:botan_project:botan:1.11.19
  • Botan 1.11.18
    cpe:2.3:a:botan_project:botan:1.11.18
  • Botan 1.11.17
    cpe:2.3:a:botan_project:botan:1.11.17
  • Botan 1.11.16
    cpe:2.3:a:botan_project:botan:1.11.16
  • Botan 1.11.15
    cpe:2.3:a:botan_project:botan:1.11.15
  • Botan 1.11.14
    cpe:2.3:a:botan_project:botan:1.11.14
  • Botan 1.11.13
    cpe:2.3:a:botan_project:botan:1.11.13
  • Botan 1.11.12
    cpe:2.3:a:botan_project:botan:1.11.12
  • Botan 1.11.11
    cpe:2.3:a:botan_project:botan:1.11.11
  • Botan 1.11.10
    cpe:2.3:a:botan_project:botan:1.11.10
  • Botan 1.11.9
    cpe:2.3:a:botan_project:botan:1.11.9
  • Botan 1.11.8
    cpe:2.3:a:botan_project:botan:1.11.8
  • Botan 1.11.7
    cpe:2.3:a:botan_project:botan:1.11.7
  • Botan 1.11.6
    cpe:2.3:a:botan_project:botan:1.11.6
  • Botan 1.11.5
    cpe:2.3:a:botan_project:botan:1.11.5
  • Botan 1.11.4
    cpe:2.3:a:botan_project:botan:1.11.4
  • Botan 1.11.3
    cpe:2.3:a:botan_project:botan:1.11.3
  • Botan 1.11.2
    cpe:2.3:a:botan_project:botan:1.11.2
  • Botan 1.11.1
    cpe:2.3:a:botan_project:botan:1.11.1
  • Botan 1.11.0
    cpe:2.3:a:botan_project:botan:1.11.0
  • Botan 1.10.13
    cpe:2.3:a:botan_project:botan:1.10.13
  • Debian Linux 8.0 (Jessie)
    cpe:2.3:o:debian:debian_linux:8.0
CVSS
Base: 5.0 (as of 09-06-2016 - 12:53)
Impact:
Exploitability:
CWE CWE-200
CAPEC
  • Subverting Environment Variable Values
    The attacker directly or indirectly modifies environment variables used by or controlling the target software. The attacker's goal is to cause the target software to deviate from its expected operation in a manner that benefits the attacker.
  • Footprinting
    An attacker engages in probing and exploration activity to identify constituents and properties of the target. Footprinting is a general term to describe a variety of information gathering techniques, often used by attackers in preparation for some attack. It consists of using tools to learn as much as possible about the composition, configuration, and security mechanisms of the targeted application, system or network. Information that might be collected during a footprinting effort could include open ports, applications and their versions, network topology, and similar information. While footprinting is not intended to be damaging (although certain activities, such as network scans, can sometimes cause disruptions to vulnerable applications inadvertently) it may often pave the way for more damaging attacks.
  • Exploiting Trust in Client (aka Make the Client Invisible)
    An attack of this type exploits a programs' vulnerabilities in client/server communication channel authentication and data integrity. It leverages the implicit trust a server places in the client, or more importantly, that which the server believes is the client. An attacker executes this type of attack by placing themselves in the communication channel between client and server such that communication directly to the server is possible where the server believes it is communicating only with a valid client. There are numerous variations of this type of attack.
  • Browser Fingerprinting
    An attacker carefully crafts small snippets of Java Script to efficiently detect the type of browser the potential victim is using. Many web-based attacks need prior knowledge of the web browser including the version of browser to ensure successful exploitation of a vulnerability. Having this knowledge allows an attacker to target the victim with attacks that specifically exploit known or zero day weaknesses in the type and version of the browser used by the victim. Automating this process via Java Script as a part of the same delivery system used to exploit the browser is considered more efficient as the attacker can supply a browser fingerprinting method and integrate it with exploit code, all contained in Java Script and in response to the same web page request by the browser.
  • Session Credential Falsification through Prediction
    This attack targets predictable session ID in order to gain privileges. The attacker can predict the session ID used during a transaction to perform spoofing and session hijacking.
  • Reusing Session IDs (aka Session Replay)
    This attack targets the reuse of valid session ID to spoof the target system in order to gain privileges. The attacker tries to reuse a stolen session ID used previously during a transaction to perform spoofing and session hijacking. Another name for this type of attack is Session Replay.
  • Using Slashes in Alternate Encoding
    This attack targets the encoding of the Slash characters. An attacker would try to exploit common filtering problems related to the use of the slashes characters to gain access to resources on the target host. Directory-driven systems, such as file systems and databases, typically use the slash character to indicate traversal between directories or other container components. For murky historical reasons, PCs (and, as a result, Microsoft OSs) choose to use a backslash, whereas the UNIX world typically makes use of the forward slash. The schizophrenic result is that many MS-based systems are required to understand both forms of the slash. This gives the attacker many opportunities to discover and abuse a number of common filtering problems. The goal of this pattern is to discover server software that only applies filters to one version, but not the other.
Access
VectorComplexityAuthentication
NETWORK LOW NONE
Impact
ConfidentialityIntegrityAvailability
PARTIAL NONE NONE
nessus via4
  • NASL family Fedora Local Security Checks
    NASL id FEDORA_2016-A545F81683.NASL
    description >From the upstream release notes: Botan 1.10.13 has been released backporting some side channel protections for ECDSA signatures (CVE-2016-2849) and PKCS #1 RSA decryption (CVE-2015-7827). Note that Tenable Network Security has extracted the preceding description block directly from the Fedora security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.
    last seen 2019-02-21
    modified 2016-10-18
    plugin id 90969
    published 2016-05-09
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=90969
    title Fedora 24 : botan-1.10.13-1.fc24 (2016-a545f81683)
  • NASL family Fedora Local Security Checks
    NASL id FEDORA_2016-F2AAE0DBC5.NASL
    description From the upstream release notes : Botan 1.10.13 has been released backporting some side channel protections for ECDSA signatures (CVE-2016-2849) and PKCS #1 RSA decryption (CVE-2015-7827). Note that Tenable Network Security has extracted the preceding description block directly from the Fedora update system website. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.
    last seen 2019-02-21
    modified 2016-10-18
    plugin id 92200
    published 2016-07-14
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=92200
    title Fedora 23 : botan (2016-f2aae0dbc5)
  • NASL family FreeBSD Local Security Checks
    NASL id FREEBSD_PKG_AC0900DF31D011E68E82002590263BF5.NASL
    description Jack Lloyd reports : Botan 1.10.13 has been released backporting some side channel protections for ECDSA signatures (CVE-2016-2849) and PKCS #1 RSA decryption (CVE-2015-7827).
    last seen 2019-02-21
    modified 2018-11-10
    plugin id 91582
    published 2016-06-14
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=91582
    title FreeBSD : botan -- multiple vulnerabilities (ac0900df-31d0-11e6-8e82-002590263bf5)
  • NASL family Debian Local Security Checks
    NASL id DEBIAN_DSA-3565.NASL
    description Several security vulnerabilities were found in botan1.10, a C++ library which provides support for many common cryptographic operations, including encryption, authentication, X.509v3 certificates and CRLs. - CVE-2015-5726 The BER decoder would crash due to reading from offset 0 of an empty vector if it encountered a BIT STRING which did not contain any data at all. This can be used to easily crash applications reading untrusted ASN.1 data, but does not seem exploitable for code execution. - CVE-2015-5727 The BER decoder would allocate a fairly arbitrary amount of memory in a length field, even if there was no chance the read request would succeed. This might cause the process to run out of memory or invoke the OOM killer. - CVE-2015-7827 Use constant time PKCS #1 unpadding to avoid possible side channel attack against RSA decryption - CVE-2016-2194 Infinite loop in modular square root algorithm. The ressol function implementing the Tonelli-Shanks algorithm for finding square roots could be sent into a nearly infinite loop due to a misplaced conditional check. This could occur if a composite modulus is provided, as this algorithm is only defined for primes. This function is exposed to attacker controlled input via the OS2ECP function during ECC point decompression. - CVE-2016-2195 Fix Heap overflow on invalid ECC point. - CVE-2016-2849 Use constant time modular inverse algorithm to avoid possible side channel attack against ECDSA.
    last seen 2019-02-21
    modified 2018-11-10
    plugin id 90841
    published 2016-05-03
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=90841
    title Debian DSA-3565-1 : botan1.10 - security update
  • NASL family Fedora Local Security Checks
    NASL id FEDORA_2016-FE0D8F126A.NASL
    description From the upstream release notes : Botan 1.10.13 has been released backporting some side channel protections for ECDSA signatures (CVE-2016-2849) and PKCS #1 RSA decryption (CVE-2015-7827). Note that Tenable Network Security has extracted the preceding description block directly from the Fedora update system website. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.
    last seen 2019-02-21
    modified 2016-10-18
    plugin id 92216
    published 2016-07-14
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=92216
    title Fedora 22 : botan (2016-fe0d8f126a)
refmap via4
confirm http://botan.randombit.net/security.html
debian DSA-3565
fedora FEDORA-2016-a545f81683
mlist [botan-devel] 20160428 Botan 1.10.13 released
Last major update 09-06-2016 - 14:00
Published 13-05-2016 - 10:59
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