UBUNTU-CVE-2018-14633
A security flaw was found in the chap_server_compute_md5() function in the ISCSI target code in the Linux kernel in a way an authentication request from an ISCSI initiator is processed. An unauthenticated remote attacker can cause a stack buffer overflow and smash up to 17 bytes of the stack. The attack requires the iSCSI target to be enabled on the victim host. Depending on how the target's code was built (i.e. depending on a compiler, compile flags and hardware architecture) an attack may lead to a system crash and thus to a denial-of-service or possibly to a non-authorized access to data exported by an iSCSI target. Due to the nature of the flaw, privilege escalation cannot be fully ruled out, although we believe it is highly unlikely. Kernel versions 4.18.x, 4.14.x and 3.10.x are believed to be vulnerable.
02 / AFFECTED SOFTWARE
Affected packages
138 explicit affected versions
19 explicit affected versions
2 explicit affected versions
59 explicit affected versions
81 explicit affected versions
40 explicit affected versions
22 explicit affected versions
20 explicit affected versions
40 explicit affected versions
19 explicit affected versions
53 explicit affected versions
51 explicit affected versions
18 explicit affected versions
13 explicit affected versions
13 explicit affected versions
12 explicit affected versions
13 explicit affected versions
10 explicit affected versions
14 explicit affected versions
26 explicit affected versions
51 explicit affected versions
6 explicit affected versions
12 explicit affected versions
1 explicit affected versions
1 explicit affected versions
23 explicit affected versions
1 explicit affected versions
3 explicit affected versions
03 / CONNECTIONS
Connected vulnerabilities
04 / EVIDENCE
Source records
A security flaw was found in the chap_server_compute_md5() function in the ISCSI target code in the Linux kernel in a way an authentication request from an ISCSI initiator is processed. An unauthenticated remote attacker can cause a stack buffer overflow and smash up to 17 bytes of the stack. The attack requires the iSCSI target to be enabled on the victim host. Depending on how the target's code was built (i.e. depending on a compiler, compile flags and hardware architecture) an attack may lead to a system crash and thus to a denial-of-service or possibly to a non-authorized access to data exported by an iSCSI target. Due to the nature of the flaw, privilege escalation cannot be fully ruled out, although we believe it is highly unlikely. Kernel versions 4.18.x, 4.14.x and 3.10.x are believed to be vulnerable.
05 / REFERENCES
Further evidence
- https://ubuntu.com/security/CVE-2018-14633
- https://ubuntu.com/security/notices/USN-3775-1
- https://ubuntu.com/security/notices/USN-3775-2
- https://ubuntu.com/security/notices/USN-3776-1
- https://ubuntu.com/security/notices/USN-3776-2
- https://ubuntu.com/security/notices/USN-3777-1
- https://ubuntu.com/security/notices/USN-3777-2
- https://ubuntu.com/security/notices/USN-3777-3
- https://ubuntu.com/security/notices/USN-3779-1
- https://www.cve.org/CVERecord?id=CVE-2018-14633