Actively exploited · Published Aug 17, 2023 · Assigned by juniper

CVE-2023-36846Junos OS: SRX Series: A vulnerability in J-Web allows an unauthenticated attacker to upload arbitrary files

Medium 5.3 Exploited

In plain English

A medium-severity missing authentication in Junos OS from Juniper Networks. Attackers are actively exploiting it in the wild (listed by CISA on November 13, 2023). The chance it is exploited in the next 30 days is estimated at 93.5% (higher than 99.8% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code. Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

Severity (CVSS 3.1)5.3Medium

Exploit odds (30 days)93.5%top 0.2% of all CVEs

Exploited in the wildYesCISA KEV since Nov 13, 2023

Attack tooling1Public PoC

CISA guidance

Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

Federal agencies must remediate by Nov 17, 2023.

Official description

A Missing Authentication for Critical Function vulnerability in Juniper Networks Junos OS on SRX Series allows an unauthenticated, network-based attacker to cause limited impact to the file system integrity. With a specific request to user.php that doesn't require authentication an attacker is able to upload arbitrary files via J-Web, leading to a loss of integrity for a certain part of the file system, which may allow chaining to other vulnerabilities. This issue affects Juniper Networks Junos OS on SRX Series: * All versions prior to 20.4R3-S8; * 21.1 versions 21.1R1 and later; * 21.2 versions prior to 21.2R3-S6; * 21.3 versions prior to 21.3R3-S5; * 21.4 versions prior to 21.4R3-S5; * 22.1 versions prior to 22.1R3-S3; * 22.2 versions prior to 22.2R3-S2; * 22.3 versions prior to 22.3R2-S2, 22.3R3; * 22.4 versions prior to 22.4R2-S1, 22.4R3.

Affected products (as reported)

Vendor	Product	Versions
Juniper Networks	Junos OS	0 – before 20.4R3-S821.1 – before 21.1*21.2 – before 21.2R3-S621.3 – before 21.3R3-S521.4 – before 21.4R3-S522.1 – before 22.1R3-S322.2 – before 22.2R3-S222.3 – before 22.3R2-S2, 22.3R3

Weakness: CWE-306 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

References

https://supportportal.juniper.net/JSA72300 vendor-advisory, mitigation
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-36846 government-resource