USN-7404-1: phpseclib vulnerabilities

2 April 2025

Several security issues were fixed in phpseclib.

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Releases

Packages

  • php-phpseclib - implementations of an arbitrary-precision integer arithmetic
  • php-phpseclib3 - implementations of an arbitrary-precision integer arithmetic
  • phpseclib - implementations of an arbitrary-precision integer arithmetic

Details

It was discovered that phpseclib did not correctly handle RSA PKCS#1
v1.5 signature verification. An attacker could possibly use this issue to
bypass authentication. This issue only affected Ubuntu 20.04 LTS.
(CVE-2021-30130)

It was discovered that phpseclib did not correctly handle certain
characters in certain TLS fields, which could lead to name confusion.
An attacker could possibly use this issue to bypass authentication.
(CVE-2023-52892)

It was discovered that phpseclib incorrectly limited the size of prime
numbers generated by isPrime. An attacker could possibly use this issue
to cause a denial of service. (CVE-2024-27354)

It was discovered that phpseclib did not correctly handle processing the
ASN.1 object identifier of a certificate. An attacker could possibly use
this issue to cause a denial of service. This issue only affected
Ubuntu 20.04 LTS and Ubuntu 22.04 LTS. (CVE-2024-27355)

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Ubuntu Pro provides ten-year security coverage to 25,000+ packages in Main and Universe repositories, and it is free for up to five machines.

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Update instructions

The problem can be corrected by updating your system to the following package versions:

Ubuntu 22.04
Ubuntu 20.04
Ubuntu 18.04
Ubuntu 16.04

In general, a standard system update will make all the necessary changes.

References

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Further reading