Multiple vulnerabilities in Fedoraproject Fedora



| Updated: 2020-08-09
Risk Medium
Patch available YES
Number of vulnerabilities 3
CVE-ID CVE-2016-2850
CVE-2016-2849
CVE-2015-7827
CWE-ID CWE-20
CWE-200
Exploitation vector Network
Public exploit N/A
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

Security Bulletin

This security bulletin contains information about 3 vulnerabilities.

1) Input validation error

EUVDB-ID: #VU40296

Risk: Medium

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

CVE-ID: CVE-2016-2850

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows a remote non-authenticated attacker to manipulate data.

Botan 1.11.x before 1.11.29 does not enforce TLS policy for (1) signature algorithms and (2) ECC curves, which allows remote attackers to conduct downgrade attacks via unspecified vectors.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Fedora: 24

Botan: 1.11.0 - 24

CPE2.3 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=145852488622892&w=2
https://security.gentoo.org/glsa/201701-23


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.

2) Information disclosure

EUVDB-ID: #VU40297

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-2016-2849

CWE-ID: CWE-200 - Information exposure

Exploit availability: No

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 1.11.29 do not use a constant-time algorithm to perform a modular inverse on the signature nonce k, which might allow remote attackers to obtain ECDSA secret keys via a timing side-channel attack.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Debian Linux: 8.0

Fedora: 24

Botan: 1.10.12 - 24

CPE2.3 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
https://security.gentoo.org/glsa/201701-23


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.

3) Information disclosure

EUVDB-ID: #VU40301

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 - Information exposure

Exploit availability: No

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 - 24

Debian Linux: 1.11.0 - 24

CPE2.3 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


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.



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