#VU40301 Information disclosure in Debian products - CVE-2015-7827

Vulnerability identifier: #VU40301

Vulnerability risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2015-7827

CWE-ID: CWE-200

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Fedora
Operating systems & Components / Operating system
Debian Linux
Operating systems & Components / Operating system
Botan
Universal components / Libraries / Libraries used by multiple products

Vendor: Fedoraproject
Randombit
Debian

Description

The vulnerability allows a remote non-authenticated attacker to gain access to sensitive information.

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.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Fedora: 24

Botan: 1.11.0 - 1.11.21, 24

Debian Linux: 1.11.0 - 24

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External links
https://botan.randombit.net/security.html
https://lists.fedoraproject.org/pipermail/package-announce/2016-May/183669.html
https://marc.info/?l=botan-devel&m=146185420505943&w=2
https://www.debian.org/security/2016/dsa-3565

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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.