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CVE-2023-34325— Multiple vulnerabilities in libfsimage disk handling

Quick assessment

Affected
Xen Xen
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Xen是英国剑桥（Cambridge）大学的一款开源的虚拟机监视器产品。该产品能够使不同和不兼容的操作系统运行在同一台计算机上，并支持在运行时进行迁移，保证正常运行并且避免宕机。 Xen 存在安全漏洞，该漏洞源于libfsimage磁盘处理中存在多个漏洞。

AI Predicted 7.8 Difficulty: Easy EPSS 0.29% · P20
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I. Basic Information for CVE-2023-34325

Vulnerability Information
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Vulnerability Title
Multiple vulnerabilities in libfsimage disk handling
Source: CVE Program / CVE List V5
Vulnerability Description
[This CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to which CVE.] libfsimage contains parsing code for several filesystems, most of them based on grub-legacy code. libfsimage is used by pygrub to inspect guest disks. Pygrub runs as the same user as the toolstack (root in a priviledged domain). At least one issue has been reported to the Xen Security Team that allows an attacker to trigger a stack buffer overflow in libfsimage. After further analisys the Xen Security Team is no longer confident in the suitability of libfsimage when run against guest controlled input with super user priviledges. In order to not affect current deployments that rely on pygrub patches are provided in the resolution section of the advisory that allow running pygrub in deprivileged mode. CVE-2023-4949 refers to the original issue in the upstream grub project ("An attacker with local access to a system (either through a disk or external drive) can present a modified XFS partition to grub-legacy in such a way to exploit a memory corruption in grub’s XFS file system implementation.") CVE-2023-34325 refers specifically to the vulnerabilities in Xen's copy of libfsimage, which is decended from a very old version of grub.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Xen 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Xen是英国剑桥（Cambridge）大学的一款开源的虚拟机监视器产品。该产品能够使不同和不兼容的操作系统运行在同一台计算机上，并支持在运行时进行迁移，保证正常运行并且避免宕机。 Xen 存在安全漏洞，该漏洞源于libfsimage磁盘处理中存在多个漏洞。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Xen Xen consult Xen advisory XSA-443 -

II. Public POCs for CVE-2023-34325

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III. Intelligence Information for CVE-2023-34325

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Other References for CVE-2023-34325 (1)

Same Patch Batch · Xen · 2024-01-05 · 10 CVEs total

CVE-2023-46837 arm32: The cache may not be properly cleaned/invalidated (take two)
CVE-2023-46836 x86: BTC/SRSO fixes not fully effective
CVE-2023-46835 x86/AMD: mismatch in IOMMU quarantine page table levels
CVE-2023-34327 x86/AMD: Debug Mask handling
CVE-2023-34328 x86/AMD: Debug Mask handling
CVE-2023-34326 x86/AMD: missing IOMMU TLB flushing
CVE-2023-34323 xenstored: A transaction conflict can crash C Xenstored
CVE-2023-34322 top-level shadow reference dropped too early for 64-bit PV guests
CVE-2023-34321 arm32: The cache may not be properly cleaned/invalidated

IV. Related Vulnerabilities

Same product: Xen
Same vendor: Xen

V. Comments for CVE-2023-34325

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