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🛡️ CVE-2023-3247 on Ubuntu — php5

⚪ Unknown ✅ No Known Exploit OSV
N/A
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

In PHP versions 8.0.* before 8.0.29, 8.1.* before 8.1.20, 8.2.* before 8.2.7 when using SOAP HTTP Digest Authentication, random value generator was not checked for failure, and was using narrower range of values than it should have. In case of random generator failure, it could lead to a disclosure of 31 bits of uninitialized memory from the client to the server, and it also made easier to a malicious server to guess the client's nonce.

Distribution advisory

This page covers CVE-2023-3247 as tracked by Ubuntu, for the package php5. The fix is available in version 7.0.33-0ubuntu0.16.04.16+esm7; earlier versions remain affected.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is high, an attacker needs low-level privileges on the target. A user must be tricked into taking some action. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality low, integrity none, availability none.

CVSS metrics in full

The score comes from this vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:N/A:N

  • Attack vector: Network — reachable from anywhere that can route to the service.
  • Attack complexity: High — the attacker first has to win a race, learn a secret or otherwise prepare the target.
  • Privileges required: Low — an ordinary user account is enough.
  • User interaction: Required — someone has to click, open or visit something.
  • Scope: Unchanged — the damage stays inside the vulnerable component.
  • Confidentiality impact: Low — limited, and the attacker does not choose what is affected.
  • Integrity impact: None.
  • Availability impact: None.

Affected software

UBUNTU-CVE-2023-3247 is recorded against 5 packages.

  • php5
  • php7.0 (fixed in 7.0.33-0ubuntu0.16.04.16+esm7)
  • php7.2 (fixed in 7.2.24-0ubuntu0.18.04.17+esm1)
  • php7.4 (fixed in 7.4.3-4ubuntu2.19)
  • php8.1 (fixed in 8.1.2-1ubuntu2.13)

Timeline and source

Published on 19 June 2023 and last revised on 22 April 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.

References

ubuntu.com (Report)
github.com (Report)
github.com (Report)
github.com (Report)
ubuntu.com (Advisory)
ubuntu.com (Advisory)
www.cve.org (Report)

Other advisories for this package

php5 has other advisories on record. If you are patching this one, these are worth checking on the same host:

CVE-2023-3247 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Severity Unknown
CVSS Score N/A
CVSS Vector CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:N/A:N
CWE N/A
Public Exploit ✅ No
Source OSV
Published 2023-06-19
Updated 2026-08-20
Modified 2026-04-22
Fix URL N/A

Affected Packages

Software From version Fixed in
php5 — —
php7.0 — 7.0.33-0ubuntu0.16.04.16+esm7
php7.2 — 7.2.24-0ubuntu0.18.04.17+esm1
php7.4 — 7.4.3-4ubuntu2.19
php8.1 — 8.1.2-1ubuntu2.13

Vulnerability Monitoring

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