CVE-2024-27354
An attacker can construct a malformed certificate containing an extremely large prime to cause a denial of service (CPU consumption for an isPrime primality check).
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.60%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
An issue was discovered in phpseclib 1.x before 1.0.23, 2.x before 2.0.47, and 3.x before 3.0.36. An attacker can construct a malformed certificate containing an extremely large prime to cause a denial of service (CPU consumption for an isPrime primality check). NOTE: this issue was introduced when attempting to fix CVE-2023-27560.
- CVSS 3.1
- 7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 0.60% probability · 47th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-400
- Affected
- phpseclib/phpseclib · debian/debian linux
- Source
- cve@mitre.org
References
- https://gist.github.com/katzj/ee72f3c2a00590812b2ea3c0c8890e0bThird Party Advisory
- https://github.com/phpseclib/phpseclib/blob/master/phpseclib/Math/PrimeField.php#L49Product
- https://lists.debian.org/debian-lts-announce/2024/03/msg00002.htmlMailing List, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2024/03/msg00003.htmlMailing List, Third Party Advisory
- https://gist.github.com/katzj/ee72f3c2a00590812b2ea3c0c8890e0bThird Party Advisory
- https://github.com/phpseclib/phpseclib/blob/master/phpseclib/Math/PrimeField.php#L49Product
- https://lists.debian.org/debian-lts-announce/2024/03/msg00002.htmlMailing List, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2024/03/msg00003.htmlMailing List, Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.