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CWE-193 Off-by-one错误 类漏洞列表 79

CWE-193 Off-by-one错误 类弱点 79 条 CVE 漏洞汇总,含 AI 中文分析。

CWE-193 属于边界计算错误,指软件在计算或使用时,最大值或最小值偏离正确值一个单位。攻击者常利用此缺陷触发缓冲区溢出或逻辑绕过,从而执行恶意代码或破坏系统完整性。开发者应避免此类问题,需严格验证边界条件,使用安全的数组访问函数,并在代码审查中重点关注循环终止条件和索引计算逻辑,确保数值处理精确无误。

MITRE CWE 官方描述
CWE:CWE-193 Off-by-one Error 英文:产品计算或使用了一个错误的最大值或最小值,该值比正确值大 1 或小 1。
常见影响 (3)
Availability DoS: Crash, Exit, or Restart, DoS: Resource Consumption (CPU), DoS: Resource Consumption (Memory), DoS: Instability
This weakness will generally lead to undefined behavior and therefore crashes. In the case of overflows involving loop index variables, the likelihood of infinite loops is also high.
Integrity Modify Memory
If the value in question is important to data (as opposed to flow), simple data corruption has occurred. Also, if the wrap around results in other conditions such as buffer overflows, further memory corruption may occur.
Confidentiality, Availability, Access Control Execute Unauthorized Code or Commands, Bypass Protection Mechanism
This weakness can sometimes trigger buffer overflows which can be used to execute arbitrary code. This is usually outside the scope of a program's implicit security policy.
缓解措施 (1)
Implementation When copying character arrays or using character manipulation methods, the correct size parameter must be used to account for the null terminator that needs to be added at the end of the array. Some examples of functions susceptible to this weakness in C include strcpy(), strncpy(), strcat(), strncat(), printf(), sprintf(), scanf() and sscanf().
代码示例 (2)
The following code allocates memory for a maximum number of widgets. It then gets a user-specified number of widgets, making sure that the user does not request too many. It then initializes the elements of the array using InitializeWidget(). Because the number of widgets can vary for each request, the code inserts a NULL pointer to signify the location of the last widget.
int i; unsigned int numWidgets; Widget **WidgetList; numWidgets = GetUntrustedSizeValue(); if ((numWidgets == 0) || (numWidgets > MAX_NUM_WIDGETS)) { ExitError("Incorrect number of widgets requested!"); } WidgetList = (Widget **)malloc(numWidgets * sizeof(Widget *)); printf("WidgetList ptr=%p\n", WidgetList); for(i=0; i<numWidgets; i++) { WidgetList[i] = InitializeWidget(); } WidgetList[numWidgets] = NULL; showWidgets(WidgetList);
Bad · C
In this example, the code does not account for the terminating null character, and it writes one byte beyond the end of the buffer.
char firstname[20]; char lastname[20]; char fullname[40]; fullname[0] = '\0'; strncat(fullname, firstname, 20); strncat(fullname, lastname, 20);
Bad · C
char firstname[20]; char lastname[20]; char fullname[40]; fullname[0] = '\0'; strncat(fullname, firstname, sizeof(fullname)-strlen(fullname)-1); strncat(fullname, lastname, sizeof(fullname)-strlen(fullname)-1);
Good · C
CVE ID 标题 CVSS 风险等级 Published
CVE-2026-68767 hashcat 7.1.2 fgetl()堆溢出漏洞 — hashcat 6.1 Medium 2026-08-22
CVE-2026-66806 Microsoft Office Word 缓冲区错误漏洞 — Microsoft 365 Apps for Enterprise 5.5 Medium 2026-08-11
CVE-2026-71391 GNU Emacs 数字错误漏洞 — Emacs 5.3 Medium 2026-08-10
CVE-2026-11771 OpenVPN 缓冲区错误漏洞 — OpenVPN 7.0 High 2026-07-30
CVE-2026-44687 NLnet Labs Unbound 数字错误漏洞 — Unbound 3.7 Low 2026-07-22
CVE-2026-50497 Microsoft Windows Remote Desktop Protocol 数字错误漏洞 — Windows 10 Version 1607 6.5 Medium 2026-07-14
CVE-2026-58380 GIMP 数字错误漏洞 — Red Hat Enterprise Linux 9 7.3 High 2026-07-06
CVE-2026-12413 The Libreswan Project libreswan 数字错误漏洞 — libreswan 7.5 High 2026-07-02
CVE-2026-7831 UltraVNC 数字错误漏洞 — UltraVNC 7.5 High 2026-07-01
CVE-2026-44042 UltraVNC 数字错误漏洞 — UltraVNC 3.7 Low 2026-07-01
CVE-2026-58014 GNOME glib 数字错误漏洞 — GLib 7.3 High 2026-06-30
CVE-2026-58374 Jouni Malinen hostapd 数字错误漏洞 — hostapd 6.5 Medium 2026-06-30
CVE-2026-56790 CANBOAT 数字错误漏洞 — canboat 7.3 High 2026-06-25
CVE-2026-56787 Tomoji Takasu RTKLIB 数字错误漏洞 — RTKLIB 6.5 Medium 2026-06-25
CVE-2026-52804 Gogs 数字错误漏洞 — gogs - - 2026-06-24
CVE-2026-54410 Valerio De Benedetto nanoMODBUS 数字错误漏洞 — nanoMODBUS 8.6 High 2026-06-14
CVE-2026-46559 ImageMagick 安全漏洞 — ImageMagick 4.0 Medium 2026-06-10
CVE-2026-49127 Music Player Daemon 安全漏洞 — MPD 8.6 High 2026-05-28
CVE-2026-42015 GnuTLS 安全漏洞 5.3 Medium 2026-05-26
CVE-2026-44065 Netatalk 安全漏洞 — Netatalk 3.7 Medium 2026-05-21
CVE-2026-45232 Rsync 安全漏洞 — rsync 3.1 Low 2026-05-20
CVE-2026-44603 Tor 安全漏洞 — Tor 3.7 Low 2026-05-07
CVE-2026-7572 Velocidex Velociraptor 安全漏洞 — velociraptor 4.4 Medium 2026-05-06
CVE-2026-43964 Postfix 安全漏洞 — Postfix 3.7 Low 2026-05-04
CVE-2026-43860 mutt 安全漏洞 — mutt 3.7 Low 2026-05-04
CVE-2026-40254 FreeRDP 安全漏洞 — FreeRDP 4.2 Medium 2026-04-24
CVE-2026-6861 Red Hat Enterprise Linux 10 安全漏洞 — Red Hat Enterprise Linux 10 6.1 Medium 2026-04-22
CVE-2026-40312 ImageMagick 安全漏洞 — ImageMagick 6.2 Medium 2026-04-13
CVE-2026-33997 Moby 安全漏洞 — moby 6.8 Medium 2026-03-31
CVE-2026-5123 GoBGP 安全漏洞 — GoBGP 3.7 Low 2026-03-30

CWE-193(Off-by-one错误) 是常见的弱点类别,本平台收录该类弱点关联的 79 条 CVE 漏洞。