Lucene search

K
alpinelinuxAlpine Linux Development TeamALPINE:CVE-2023-29409
HistoryAug 02, 2023 - 8:15 p.m.

CVE-2023-29409

2023-08-0220:15:11
Alpine Linux Development Team
security.alpinelinux.org
12
rsa keys
certificate chains
cpu time
signatures verification
handshakes
web pki
default safety
crypto/tls
private pkis

CVSS3

5.3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

LOW

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

AI Score

6.8

Confidence

High

EPSS

0.001

Percentile

31.3%

Extremely large RSA keys in certificate chains can cause a client/server to expend significant CPU time verifying signatures. With fix, the size of RSA keys transmitted during handshakes is restricted to <= 8192 bits. Based on a survey of publicly trusted RSA keys, there are currently only three certificates in circulation with keys larger than this, and all three appear to be test certificates that are not actively deployed. It is possible there are larger keys in use in private PKIs, but we target the web PKI, so causing breakage here in the interests of increasing the default safety of users of crypto/tls seems reasonable.

CVSS3

5.3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

LOW

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

AI Score

6.8

Confidence

High

EPSS

0.001

Percentile

31.3%