USN-8303-1: GitPython vulnerabilities

Santos Gallegos discovered that GitPython did not properly validate
paths when resolving certain Git references. An attacker could possibly
use this issue to cause files outside the .git directory to be accessed,
leading to a denial of service. This issue only affected Ubuntu 14.04
LTS, Ubuntu 16.04 LTS, Ubuntu 18.04 LTS, Ubuntu 20.04 LTS, and Ubuntu
22.04 LTS. (CVE-2023-41040)

Wes Ring discovered that GitPython did not properly block certain unsafe
Git options when they were provided as Python keyword arguments. An
attacker could possibly use this issue to cause arbitrary command
execution. (CVE-2026-42215)

It was discovered that GitPython did not properly validate clone options
before processing them. An attacker could possibly use this issue to
inject unsafe Git configuration, leading to arbitrary command execution
through Git hooks. This issue only affected Ubuntu 20.04 LTS, Ubuntu
22.04 LTS, Ubuntu 24.04 LTS, and Ubuntu 26.04 LTS. (CVE-2026-42284)

It was discovered that GitPython did not properly validate reference
paths during reference operations. An attacker could possibly use this
issue to write, overwrite, move, or delete files outside the repository.
(CVE-2026-44243)

Dan Aridor discovered that GitPython did not properly validate
configuration values before writing them to Git configuration files. An
attacker could possibly use this issue to inject unsafe Git
configuration, leading to arbitrary command execution through Git hooks.
(CVE-2026-44244)

nmap -sV --script vuln -p- <target-network>

tail -f /var/log/suricata/fast.log | grep <cve>

Check Vendor Security Advisory Bulletin

title: Detect Exploitation - USN-8303-1: GitPython vulnerabilities
id: 9e0ea88c-a68f-405b-805a-21d1ecd9e8be
status: experimental
description: Automatisch generierte SIEM-Erkennungsregel basierend auf CTI Intelligence
references:
  - https://tsecurity.de/
author: iShareStuff CTI Automated Detection Engine
date: 2026-09-25
logsource:
  category: network_connection
  product: any
detection:
  selection:
      CommandLine|contains:
        - 'exploit'
  condition: selection
falsepositives:
  - Legitime administrative Zugriffe oder Penetrationstests
level: high
tags:
  - attack.initial_access

rule CTI_Threat_Indicator {
    meta:
        author = "iShareStuff CTI Automated Detection Engine"
        date = "2026-09-25"
        description = "YARA Signature for "
    strings:
        $str = "USN-8303-1: GitPython vulnerab" ascii wide
    condition:
        any of them
}

index=security sourcetype IN ("cisco:asa", "pan:traffic", "zeek_conn", "suricata", "WinEventLog:Security")
("USN-8303-1 GitPython vulnerabilities")
| stats count earliest(_time) as first_seen latest(_time) as last_seen by src_ip, dest_ip, dest_host, signature
| eval first_seen=strftime(first_seen, "%Y-%m-%d %H:%M:%S"), last_seen=strftime(last_seen, "%Y-%m-%d %H:%M:%S")
| sort - count

message: "*USN-8303-1 GitPython vulnerabilities*"

CommonSecurityLog
| where Message has "USN-8303-1 GitPython vulnerabilities"
| summarize EventCount = count(), FirstSeen = min(TimeGenerated), LastSeen = max(TimeGenerated) by SourceIP, DestinationIP, DestinationPort, Activity
| extend DetectionRule = "iShareStuff-CTI-Compiled"
| sort by EventCount desc

#!/usr/sbin/nft -f
# ISS-ZeroTrust Quarantine Policy for CVE-2023-41040
table inet iss_quarantine {
    chain inbound_lockdown {
        type filter hook input priority -10; policy drop;

        # Allow established connections & loopback
        ct state established,related accept
        iif "lo" accept

        # Whitelist SOC / Bastion Management Subnet
        ip saddr 10.0.0.0/8 accept
        ip saddr 192.168.1.0/24 accept

        # Explicitly log & drop vulnerable service traffic
        tcp dport 443 log prefix "[ISS-QUARANTINE-CVE-2023-41040] " drop
    }
}

apiVersion: networking.k8s.io/v1
kind: NetworkPolicy
metadata:
  name: quarantine-CVE-2023-41040
  namespace: production
  labels:
    security.isharestuff.com/quarantine: "true"
    cve.mitigation/id: "CVE-2023-41040"
spec:
  podSelector:
    matchLabels:
      app.kubernetes.io/vulnerable-cve: "CVE-2023-41040"
  policyTypes:
    - Ingress
    - Egress
  ingress:
    # Restrict ingress solely to authorized security scanners & bastion pods
    - from:
        - namespaceSelector:
            matchLabels:
              kubernetes.io/metadata.name: soc-monitoring
      ports:
      - port: 443
        protocol: TCP
  egress:
    # Allow DNS only (isolate lateral movement)
    - to:
        - namespaceSelector: {}
          podSelector:
            matchLabels:
              k8s-app: kube-dns
      ports:
        - port: 53
          protocol: UDP

aws ec2 revoke-security-group-ingress --group-id sg-0123456789abcdef0 --protocol tcp --port 443 --cidr 0.0.0.0/0

(http.request.uri.path contains "CVE-2023-41040" or http.request.body.mime contains "exploit" or cf.threat_score gt 20)