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CVE-2016-2195

Published: 13 May 2016

Integer overflow in the PointGFp constructor in Botan before 1.10.11 and 1.11.x before 1.11.27 allows remote attackers to overwrite memory and possibly execute arbitrary code via a crafted ECC point, which triggers a heap-based buffer overflow. The bigint_mul and bigint_sqr functions received the size of the output buffer, but only used it to dispatch to a faster algorithm in cases where there was sufficient output space to call an unrolled multiplication function. The result is a heap overflow accessible via ECC point decoding, which accepted untrusted inputs. This is likely exploitable for remote code execution.

Notes

AuthorNote
seth-arnold
"Introduced in 1.9.18, fixed in 1.11.27 and 1.10.11"

Priority

Medium

Cvss 3 Severity Score

9.8

Score breakdown

Status

Package Release Status
botan1.10
Launchpad, Ubuntu, Debian
precise Ignored
(end of life)
upstream
Released (1.10.12-1)
wily Ignored
(end of life)
xenial Not vulnerable
(1.10.12-1)
yakkety Not vulnerable
(1.10.12-1)
zesty Not vulnerable
(1.10.12-1)
trusty
Released (1.10.5-1+deb7u1ubuntu0.14.04.1)

Severity score breakdown

Parameter Value
Base score 9.8
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Scope Unchanged
Confidentiality High
Integrity impact High
Availability impact High
Vector CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H